{"title":"Measuring Tools","description":null,"products":[{"product_id":"chain-checker-for-professional-use","title":"Professional Chain Wear Indicator - 1643\/4","description":"\u003cp\u003eThere's a moment in a chain's life when the readout matters more than the binary. You want to see whether you're at 0.4% or 0.55%, not just whether the chain has crossed a threshold; you're planning the next service interval, not making a single keep-or-replace call. The Professional Chain Wear Indicator 1643\/4 is the tool for that moment. It's a swing-arm dial gauge with a continuous 0 to 1.2% readout, so the chain doesn't just pass or fail; you get the actual elongation number.\u003c\/p\u003e\n\u003cp\u003eThe mechanism is simple. Two pins drop into the chain, the swing-arm is pressed tight, and the gauge window reports the wear figure. No batteries, no calibration ritual; the indicator is set at the factory and stays set for the life of the tool.\u003c\/p\u003e\n\u003ch2\u003eHow to read it\u003c\/h2\u003e\n\u003cp\u003eThe 1643\/4 reads the chain against a single replacement trigger at \u003cstrong\u003e0.6% stretch\u003c\/strong\u003e. That's the threshold most chain manufacturers historically cited as the universal swap point, and the gauge was designed around it; the dial gives you a continuous reading from 0 up through 1.2% so you can track wear progression over service visits.\u003c\/p\u003e\n\u003ch2\u003eWhen this is the right call\u003c\/h2\u003e\n\u003cp\u003eModern 11-, 12-, and 13-speed chains tighten the spec. Current chain-maker guidance is to swap a narrow-spaced chain at or before \u003cstrong\u003e0.5%\u003c\/strong\u003e, where the 1643\/4's gauge triggers replacement slightly later (0.6%). On those drivetrains, the \u003ca href=\"\/products\/chain-wear-indicator-1644-6\"\u003eChain Wear Indicator 1644\/6\u003c\/a\u003e reads both 0.5% and 0.75% directly on the tool body and is the more accurate pick.\u003c\/p\u003e\n\u003cp\u003eThe 1643\/4 stays useful where a continuous reading matters more than a tighter threshold: 6- through 10-speed drivetrains, shop benches that service mixed-fleet bikes, mechanics who want to log wear progression across service visits rather than just confirm a swap moment. It's the gauge for “how worn is this chain right now,” not the gauge for “should I replace this 12-speed today.”\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e137 × 25.5 × 20 mm\u003c\/li\u003e\n\u003cli\u003e142 g\u003c\/li\u003e\n\u003cli\u003eSwing-arm dial gauge, 0 to 1.2% range\u003c\/li\u003e\n\u003cli\u003e0.6% replacement trigger\u003c\/li\u003e\n\u003cli\u003eLifetime warranty\u003c\/li\u003e\n\u003cli\u003eArticle number: 1643\/4\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 1643\/4 is one of the older chain-wear tools in the catalog, and the gauge it carries reflects the chain-wear consensus of an earlier generation of drivetrains. The dial mechanism itself is still the cleanest way to read elongation as a continuous value; you can watch a chain age, not just confirm when it's gone.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eReading the dial is the easy part. Knowing when to act on it is where the call gets made. Our chain-replacement guide lays out what happens to the cassette teeth between 0.5% and 0.75%, why a worn chain on a new cassette is the most common drivetrain mistake, and how to plan service intervals around the gauge rather than around mileage estimates: \u003ca href=\"\/blogs\/tech-tips\/when-and-how-to-replace-your-chain\"\u003eWhen and how to replace your chain →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow is the 1643\/4 different from a drop-over chain checker?\u003c\/strong\u003e Drop-over gauges are pass\/fail — the blade either seats in the chain or it doesn't at one or two fixed thresholds. The 1643\/4 is a swing-arm dial gauge: set the pins in two links, press the arm tight, and the window reads elongation as a number anywhere on its 0–1.2 mm scale. That lets you track how far along a chain is, not just whether it has crossed a line.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it on a modern 11-, 12-, or 13-speed chain?\u003c\/strong\u003e It reads any chain — Unior's own instruction is simply to insert the pins into two links and read the gauge. The catch is the threshold: current chain-maker guidance replaces a narrow 11-to-13-speed chain at or before 0.5% elongation, and a two-pin gauge folds roller play into its millimeter reading. For those drivetrains the Chain Wear Indicator 1644\/6 reads 0.5% and 0.75% directly; the 1643\/4 is at its best on 6-to-10-speed and mixed-fleet work.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it need batteries or calibration?\u003c\/strong\u003e No. It is a purely mechanical gauge — no electronics, no battery, and no user calibration. The dial is set during manufacture; you insert the pins, press the swing arm tight, and read the wear figure in the gauge window.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the dimensions and weight?\u003c\/strong\u003e The tool measures 137 × 25.5 × 20 mm and weighs 142 g, so it stores flat in a bench drawer or travel case. It is covered by a lifetime warranty.\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":34378795384876,"sku":"617170","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/1643_4.jpg?v=1642728010"},{"product_id":"brake-caliper-for-1689-1689-2","title":"Rotor Truing Gauge - 1689.2","description":"\u003cp\u003eA bent rotor doesn't announce itself the way a out-of-true rim does. The wheel is true through the calipers and the brakes still rub somewhere in the rotation, or the lever feel goes mushy as the rotor's high spot drifts past the pad twice per revolution. The Rotor Truing Gauge 1689.2 turns that diagnostic from a guessing game into a direct read.\u003c\/p\u003e\n\u003cp\u003eThe gauge mounts into the accessory slot on the \u003ca href=\"\/products\/pro-truing-stand-1689\"\u003ePro Truing Stand 1689\u003c\/a\u003e or the \u003ca href=\"\/products\/wheel-centering-stand-for-home-use-1688\"\u003ePortable Truing Stand 1688\u003c\/a\u003e and indexes against the rotor face. Slide the indicator toward the disc, spin the wheel, and watch the gauge: a true rotor reads constant; a bent rotor reads the magnitude and the angular position of the deviation. Height-adjust to match the rotor diameter (160 \/ 180 \/ 200 \/ 220 mm rotors all work), then move the indicator inward until it's just touching the rotor face at rest.\u003c\/p\u003e\n\u003cp\u003eThe accuracy of this gauge is the difference between guessing where the rotor is bent and knowing. Once you know, the truing fork can fix it; and once the rotor reads constant through a full rotation, the caliper rub is either fixed or the caliper is the source of the problem, not the rotor.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTruing stands: \u003ca href=\"\/products\/pro-truing-stand-1689\"\u003ePro Truing Stand 1689\u003c\/a\u003e, \u003ca href=\"\/products\/wheel-centering-stand-for-home-use-1688\"\u003ePortable Truing Stand 1688\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eRotor diameters: 160, 180, 200, 220 mm; all standard disc-brake rotor sizes.\u003c\/li\u003e\n\u003cli\u003eRotor mount: works on both 6-bolt and Centerlock rotors (the gauge reads against the rotor face, not the mount).\u003c\/li\u003e\n\u003cli\u003eMax rotor thickness: 2.4 mm (covers all standard road and MTB rotors, which top out around 2.3 mm).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMount: indexes into the truing stand's accessory slot.\u003c\/li\u003e\n\u003cli\u003eAdjustment: height for rotor diameter, depth for rotor face position.\u003c\/li\u003e\n\u003cli\u003eCompatible with our \u003ca href=\"\/products\/rotor-truing-fork-2-0\"\u003eRotor Truing Fork 2.0\u003c\/a\u003e and \u003ca href=\"\/products\/rotor-truing-fork-16662dp-us\"\u003eRotor Truing Fork 1666\/2DP\u003c\/a\u003e for the actual truing pass.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 1689.2 is the disc-brake-era complement to the wheel-truing workflow: rim truing tells you the wheel is round; rotor truing tells you the rotor is. Most workshops add this gauge to the truing-stand kit the first time they spend ten minutes chasing a brake rub that turned out to be a rotor problem.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eRead the rotor first, then read the wheel. A wheel that runs true through the calipers but rubs the caliper at one point in the rotation almost always has a rotor problem, not a rim problem. Mount the 1689.2 before you reach for spoke wrenches; ten seconds of rotor diagnosis saves twenty minutes of unnecessary truing. The full disc-brake-era truing workflow is in \u003ca href=\"\/blogs\/tech-tips\/how-to-true-a-bike-wheel\"\u003eHow to true a bike wheel →\u003c\/a\u003e\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":34378795843628,"sku":"622603","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/1689.2.png?v=1642728746"},{"product_id":"chain-wear-indicator","title":"Manual Chain Wear Indicator - 1644\/2","description":"\u003cp\u003eA go\/no-go gauge gives one answer: it fits, or it doesn't. The Manual Chain Wear Indicator 1644\/2 is the cycling version of that workshop standard. Drop it across two links of a chain, push down, and the chain either holds it or lets it drop. Holds it, the chain is still inside service tolerance. Drops, the chain needs replacing.\u003c\/p\u003e\n\u003cp\u003eThere's no dial, no electronic reading, no calibration to wonder about. The 1644\/2 is a flat piece of laser-cut steel with two reference faces, each cut to a published tolerance. It's the simplest answer to “is this chain done.”\u003c\/p\u003e\n\u003ch2\u003eHow to read it\u003c\/h2\u003e\n\u003cp\u003eTwo zones are stamped on the tool:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0 to 0.6%\u003c\/strong\u003e is the no-wear side. If the gauge sits without dropping in on this end, the chain is still inside its service window.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.7% to 1.2%\u003c\/strong\u003e is the wear side. If the gauge drops in here, the chain is past replacement and the cassette teeth are next in line.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe decision is binary. There's no in-between reading to second-guess.\u003c\/p\u003e\n\u003ch2\u003eWhen this is the right call\u003c\/h2\u003e\n\u003cp\u003eThe 0.7% replacement trigger is the legacy chain-wear convention. It's accurate for \u003cstrong\u003e6- through 10-speed\u003c\/strong\u003e drivetrains, where wider cog spacing gives the chain a little more room before deformation cascades into the cassette.\u003c\/p\u003e\n\u003cp\u003eModern 11-, 12-, and 13-speed chains want a tighter call. Current chain-maker guidance is to swap a narrow-spaced chain at or before 0.5%, and the 1644\/2's drop-over only triggers at 0.7%. On those drivetrains, the \u003ca href=\"\/products\/chain-wear-indicator-1644-6\"\u003eChain Wear Indicator 1644\/6\u003c\/a\u003e reads both 0.5% and 0.75% directly and is the right tool for the speed.\u003c\/p\u003e\n\u003cp\u003eWhere the 1644\/2 still earns its space is on the older bikes, in the home toolkit that needs to be cheap and small enough to live in a drawer, and as the second gauge on a shop bench that's already running a more granular reader.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e122.5 × 37 × 2 mm (with a 12.7 mm reference length for pin-to-pin spacing)\u003c\/li\u003e\n\u003cli\u003e40 g\u003c\/li\u003e\n\u003cli\u003ePrecision laser-cut steel\u003c\/li\u003e\n\u003cli\u003eGo\/no-go reading at 0.7% replacement threshold\u003c\/li\u003e\n\u003cli\u003eLifetime warranty\u003c\/li\u003e\n\u003cli\u003eArticle number: 1644\/2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 1644\/2 is the entry-level chain-wear tool in the catalog, and the design reflects what the workshop standard quality-assurance gauge has always been: a known reference shape that either fits or doesn't, ground to a tolerance the user can trust. The cheap version of that gauge is a Popsicle stick with two notches scratched into it. This one is laser-cut steel.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eA go\/no-go reading doesn't tell you when the chain crossed the line, only that it has. Our chain-replacement guide explains what's happening on the cassette teeth between the two readings the 1644\/2 won't separate, why the 0.5% versus 0.75% distinction matters once you know which drivetrain you're on, and how to plan a new chain in before the cassette pays for the delay: \u003ca href=\"\/blogs\/tech-tips\/when-and-how-to-replace-your-chain\"\u003eWhen and how to replace your chain →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat counts as excessive wear on a bike chain?\u003c\/strong\u003e Elongation past the replacement threshold. On the 1644\/2's wear side, marked 0.7% to 1.2%, a chain that lets the gauge drop in is overdue for replacement; the cassette teeth take the damage next.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich drivetrains suit the 1644\/2's 0.7% replacement threshold?\u003c\/strong\u003e The 0.7% trigger is the legacy convention and stays right for 6- through 10-speed drivetrains, whose wider cog spacing tolerates more elongation before the cassette suffers. Chains for 11-speed and up, 12- and 13-speed included, should be swapped at or before 0.5%, a reading the Chain Wear Indicator 1644\/6 makes directly on its body.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the Manual Chain Wear Indicator need calibrating?\u003c\/strong\u003e No. It's a flat gauge in laser-cut steel whose two reference faces are cut to published tolerances; there's no dial or electronic reading to drift, and the tool carries a lifetime warranty.\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":34378795941932,"sku":"617171","price":12.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/1644_4.jpg?v=1642726473"},{"product_id":"digital-vernier-0-150mm","title":"Digital Vernier Caliper 0-150mm - 270A","description":"\u003cp\u003eA bike comes in with a stubborn headset that the customer keeps tightening. The cup-and-cone adjustment is in spec, the fork crown clears the head tube cleanly, the bearings feel good. Five tries later, nothing's changed. The thing you haven't checked is whether the head tube itself has gone slightly oval. The 270A Digital Vernier Caliper is what tells you that in three seconds; by measuring the head tube ID at two perpendicular axes and reading the difference on the screen.\u003c\/p\u003e\n\u003cp\u003eThe 270A reads 0–150 mm (0–6 in) with official accuracy of 0.02 mm \/ 0.001 in to DIN 862. Resolution on the LCD is 0.01 mm \/ 0.0005 in; the in\/mm button switches the dual scale. The finish is trivalent chrome plated and the beam is marked STAINLESS HARDENED. Official functions are internal, external, depth, and step measurement.\u003c\/p\u003e\n\u003ch2\u003eWhat it measures, in practical bike-shop terms\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRotor thickness against the manufacturer's published minimum (Shimano typically 1.5 mm minimum on common road rotors)\u003c\/li\u003e\n\u003cli\u003eAxle outer diameter when sourcing a matching dust seal or bearing\u003c\/li\u003e\n\u003cli\u003eHead-tube ID across two perpendicular axes (the oval-detection check)\u003c\/li\u003e\n\u003cli\u003eSteerer outer diameter at a sleeved section vs. an unsleeved section\u003c\/li\u003e\n\u003cli\u003eCassette spacer thickness when verifying a 142x12 vs. 148x12 conversion\u003c\/li\u003e\n\u003cli\u003eSpoke length (with the depth jaw extended) when verifying a wheel build's spoke order\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 270A is a precision instrument. That means it gets damaged by being dropped on a concrete floor, by being soaked in parts cleaner, or by being run through the bench grinder by mistake (yes, this has happened). Keep liquid out of the slider and do not drop it; the official 270A manual calls out both as electronics-killing mistakes.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e0–150 mm \/ 0–6\" range\u003c\/li\u003e\n\u003cli\u003eResolution 0.01 mm \/ 0.0005 in; official accuracy 0.02 mm \/ 0.001 in (DIN 862)\u003c\/li\u003e\n\u003cli\u003eTrivalent chrome plated; beam marked STAINLESS HARDENED\u003c\/li\u003e\n\u003cli\u003eInternal, external, depth, and step measurement\u003c\/li\u003e\n\u003cli\u003eOFF\/ON, in\/mm, and ZERO; dual mm and inch scale\u003c\/li\u003e\n\u003cli\u003ePower: one CR2025 3.0 V lithium cell (official average life: 1 year continuous, 3 years normal use)\u003c\/li\u003e\n\u003cli\u003e1-year warranty\u003c\/li\u003e\n\u003cli\u003eArticle 270A · SKU 619881 · length 235 mm · jaw height 40 mm · 460 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 270A is the digital companion to our analog \u003ca href=\"\/products\/vernier-caliper-271\"\u003eVernier Caliper 271\u003c\/a\u003e. The 271 analog sibling publishes the same 0.02 mm \/ 0.001 in accuracy and DIN 862 standard on a battery-free vernier scale; the 270A is the digital member of that pair (460 g, official 1-year warranty, CR2025).\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eThe single best diagnostic for a customer's stubborn headset adjustment is verifying the head tube hasn't ovalized. A 0.05 mm difference across the head tube ID is enough to drive a customer crazy with a headset that won't stay adjusted. Two seconds with the 270A and you have the answer. Our \u003ca href=\"\/blogs\/tech-tips\/workshop-hand-tools-every-bike-shop-needs\"\u003eworkshop hand tools guide\u003c\/a\u003e covers the measurement layer of the shop in detail: \u003ca href=\"\/blogs\/tech-tips\/workshop-hand-tools-every-bike-shop-needs\"\u003eWorkshop hand tools every bike shop needs →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat range, resolution, and accuracy does the 270A digital caliper have?\u003c\/strong\u003e Official range is 0–150 mm and 0–6 in on a dual millimeter-and-inch scale. The product page publishes accuracy of 0.02 mm \/ 0.001 in to DIN 862. The official 270A instruction manual lists resolution of 0.01 mm \/ 0.0005 in, and banded accuracy of ±0.02 mm from 0–100 mm and ±0.03 mm from 100–200 mm (this article stops at 150 mm).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat can the 270A measure on a bike?\u003c\/strong\u003e Official functions are internal dimensions, external dimensions, depth, and steps. That covers rotor thickness, axle and steerer OD, head-tube ID, spacer stacks, and spoke length with the depth rod. Buttons are OFF\/ON, in\/mm, and ZERO.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is the digital 270A different from the analog 271?\u003c\/strong\u003e Both publish the same 0.02 mm \/ 0.001 in accuracy, DIN 862, 0–150 mm \/ 0–6 in range, and the same four measuring functions. The 270A is digital (LCD resolution 0.01 mm, one CR2025 battery, 460 g, official 1-year warranty). The 271 is the analog, battery-free sibling (240 g, no warranty badge). They are separate instruments, not a spare for each other.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat battery, size, and finish does the 270A use?\u003c\/strong\u003e One CR2025 3.0 V lithium cell (official average life: 1 year continuous, 3 years normal use). Length 235 mm, jaw height (B) 40 mm, 460 g. Finish is trivalent chrome plated. The beam on the official product photo is marked STAINLESS HARDENED. Article 270A, SKU 619881.\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":34378796007468,"sku":"619881","price":79.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/270a.jpg?v=1642723773"},{"product_id":"measuring-tape-3m","title":"3m\/10ft Tape Measure - 710R-US","description":"\u003cp\u003eA metric tape measure is harder to source in the US than it should be. Most hardware-store tapes read in feet and inches first, with a metric scale shrunk to the bottom edge; useful enough until you need to read a 1-millimeter increment on a fork's recommended axle-to-crown spec, and the millimeter marks are crowded against the imperial half-inches. The 710R-US is Unior's 3 m \/ 10 ft dual-scale tape: the official table lists 3 metres and 10 feet on the same article, code 625129.\u003c\/p\u003e\n\u003cp\u003eThe tape is 3 meters \/ 10 feet long. That's the length you need for measuring frame reach (the longer the reach, the more critical a metal tape), wheel diameter (a 700c wheel measures around 670 mm at the bead seat), bar widths (a wide gravel bar is 480-500 mm), and most of the dimensional checks a working shop does on a daily basis. A shorter pocket tape covers bar width and small checks but stops short of frame-geometry work.\u003c\/p\u003e\n\u003ch2\u003eWhen you'll reach for the tape and not the caliper\u003c\/h2\u003e\n\u003cp\u003eThe caliper handles fine measurements at small ranges. The tape handles coarser measurements at long ranges. Both are necessary; neither replaces the other.\u003c\/p\u003e\n\u003cp\u003eTape work: bar width, frame reach, wheel circumference for cyclo-computer calibration, stand height when assembling a customer's bike for size, the distance between two bolts that need to be at a specific spacing.\u003c\/p\u003e\n\u003cp\u003eCaliper work: rotor thickness, axle outer diameter, head tube inner diameter, spacer thickness, anything where 0.01 mm matters. See our \u003ca href=\"\/products\/digital-vernier-0-150mm\"\u003edigital\u003c\/a\u003e or \u003ca href=\"\/products\/vernier-caliper-271\"\u003eanalog vernier caliper\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e3 meters \/ 10 feet length (official: 3 m \/ 10 ft, code 625129)\u003c\/li\u003e\n\u003cli\u003eMetric and imperial scales (official 3 m and 10 ft columns); metal measuring tape; class II precision\u003c\/li\u003e\n\u003cli\u003eStop and clip; plastic double component casing; diameter 16 mm; weight 89 g\u003c\/li\u003e\n\u003cli\u003eArticle number: 710R-US. EAN 3838909251295\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 710R-US is one of the small workshop fundamentals Unior catalogs alongside its bike-specific tools. A metric tape measure is a working-shop staple in any country that runs on metric measurements; it's a niche find in the US, which is why we stock it for US shops working on European-built bikes.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eThe single most-overlooked tape-measure use in a bike shop is calibrating a cyclo-computer's wheel circumference for a specific tire. The published spec for a tire is approximate; the actual rollout (mounted, inflated, with the rider's weight) is what the computer needs. Rolling the wheel one full revolution and measuring the distance traveled with the tape is the right answer. Our \u003ca href=\"\/blogs\/tech-tips\/workshop-hand-tools-every-bike-shop-needs\"\u003eworkshop hand tools guide\u003c\/a\u003e covers measurement tools and the rest of the workshop hand-tool layer: \u003ca href=\"\/blogs\/tech-tips\/workshop-hand-tools-every-bike-shop-needs\"\u003eWorkshop hand tools every bike shop needs →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow long is the 710R-US tape?\u003c\/strong\u003e Official length is 3 m \/ 10 ft. The face label prints 3m\/10ft. Code 625129. Unior's 710R family also has other lengths; this US article is the 3 m \/ 10 ft dual-scale SKU.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it read metric and imperial?\u003c\/strong\u003e Yes. The official 710R-US table publishes both a 3 metre column and a 10 foot column on the same article. The EU 710R page also lists metric-only SKUs (3 m with 0 ft); those are not this product.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does class II mean on this tape?\u003c\/strong\u003e Unior rates the 710R-US 'preciseness to class II' and marks the blade with a circled II, a CE mark, and a 20 °C working-temperature mark. The product page does not publish a millimetre tolerance table for that class.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow big is the case, and what ships in the box?\u003c\/strong\u003e Plastic double component case with a stop and clip, metal tape. Official diameter 16 mm, weight 89 g (tolerances apply). Article 710R-US, EAN 3838909251295. It ships as one tape. Unior lists no spare parts for it.\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":34378796892204,"sku":"625129","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/710r-us.jpg?v=1642713371"},{"product_id":"spoke-tension-meter-17522","title":"Spoke Tension Meter - 1752\/2","description":"\u003cp\u003eThe 1752\/2 is Unior's proven tension meter, the one our mechanics built with for years before the \u003ca href=\"\/products\/spoke-tension-meter-2-0\"\u003eSpoke Tension Meter 2.0\u003c\/a\u003e replaced it. It's still in production because the gauge is still right: press the handle, position the spoke between the two pins, release, read the value on the dial, cross-reference the printed spoke-information table for kilogram-force.\u003c\/p\u003e\n\u003cp\u003eThe tool ships ready to use in a protected carrying case. A calibration spoke marked with its own reference value is included, so the meter can be checked on the bench in your own shop: measure the calibration spoke like a normal spoke, and if the dial doesn't match the marked value, turn the calibration bolt on the back of the tool until it does.\u003c\/p\u003e\n\u003cp\u003eA built-in spoke-diameter gauge on the body of the tool helps identify which line in the conversion table to read. Insert any spoke in one of the upper openings, read the thickness directly, then use that thickness as the index into the printed table that ships with the meter.\u003c\/p\u003e\n\u003cp\u003eThe 1752\/2 versus the 2.0: the 1752\/2 presses the spoke against fixed pins, while the 2.0 added bearings at the spoke contact points to improve accuracy and repeatability. For shops doing high-volume building this matters; for the home mechanic building one or two wheels a season, the difference is academic. The 1752\/2 is the gauge that taught a generation of bike mechanics that tension balance is a measurable thing rather than a feel.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpokes: round and bladed steel spokes, butted profiles included; the conversion table lists end and middle diameters separately.\u003c\/li\u003e\n\u003cli\u003eSizes: round spokes 1.40–2.30 mm and bladed profiles from 0.9 × 1.8 to 1.3 × 2.8 mm per the included conversion table; the on-tool thickness gauge reads 1.0–3.3 mm.\u003c\/li\u003e\n\u003cli\u003eCalibration spoke included for on-bench calibration.\u003c\/li\u003e\n\u003cli\u003eConversion table included for KGF lookup.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFactory-calibrated and ready out of the box.\u003c\/li\u003e\n\u003cli\u003eTwo-pin spoke seat with side spacers to keep the spoke parallel.\u003c\/li\u003e\n\u003cli\u003eBuilt-in spoke-diameter gauge.\u003c\/li\u003e\n\u003cli\u003eProtected carrying case for travel and storage. Tool measures 205 × 130 × 34 mm and weighs 637 g.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 1752\/2 has been the tension meter of choice in many of those team workshops for years; the 2.0 is the redesign that came after the 1752\/2 had taught us what a tension meter needs to do day in and day out. Either gauge will give you accurate per-spoke readings; the 2.0 is the upgrade for shops that need bearing-grade repeatability, the 1752\/2 is the proven design for everyone else.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eLay the printed conversion table flat next to the wheel during the tension pass. Reading the dial, then looking up the value on the table, then writing it down is a three-step rhythm; trying to do it from memory adds a fourth step (mental math) that's where errors creep in. We keep the table in a clear plastic sleeve on the bench, and the per-spoke values get written directly on the sleeve with a wax pencil. Wipe clean between builds; nothing to print, nothing to lose. The rest of the truing workflow is in \u003ca href=\"\/blogs\/tech-tips\/how-to-true-a-bike-wheel\"\u003eHow to true a bike wheel →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhich spokes will the 1752\/2 measure?\u003c\/strong\u003e The included v2 conversion table covers round steel spokes with middle diameters from 1.40 to 2.30 mm, butted profiles included (end and middle diameters are listed separately), plus seven bladed profiles from 0.9 × 1.8 mm to 1.3 × 2.8 mm. The thickness gauge on top of the body reads spoke diameters from 1.0 to 3.3 mm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I turn the dial reading into spoke tension?\u003c\/strong\u003e Press the handle fully, seat the spoke between the two pins against the side spacers, release the pressure gently, and read the value on the 0–90 scale. Look that value up in the printed conversion table, or in the Unior Wheel Tension App, against your spoke's size to get tension in kilograms-force; 1 kgf is roughly 10 newtons. Unior recommends measuring at room temperature.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is the 1752\/2 calibrated?\u003c\/strong\u003e Each meter ships with its own calibration spoke marked with a reference value. Measure it like a normal spoke; if the dial doesn't match the marked value, turn the calibration bolt on the back of the tool, counter-clockwise if it reads low or clockwise if it reads high, and re-check until it matches. Keep the calibration spoke in the original box and use it only for this tool.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between the 1752\/2 and the Spoke Tension Meter 2.0?\u003c\/strong\u003e The 2.0 (1752\/6) added bearings at the spoke contact points to improve accuracy and repeatability, a black body, and a QR link to the tension app. The 1752\/2 presses the spoke against fixed pins and uses the same conversion-table system. It measures 205 × 130 × 34 mm, weighs 637 g, and ships with the printed table and usage instructions.\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":34378798759980,"sku":"623302","price":99.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/1752_2.jpg?v=1642729639"},{"product_id":"spoke-bearing-cotter-gauge","title":"Spoke, Cotter and Bearing Gauge - 1629","description":"\u003cp\u003eA small tool that does what its name says, the 1629 reads spoke lengths and diameters, bearing diameters, and cotter-pin sizes from a single body. It's not the most complicated piece in the wheelbuilding catalog, and it's not meant to be; the value is having one tool on the bench that answers three measurement questions a wheel-and-hub builder asks routinely.\u003c\/p\u003e\n\u003cp\u003eThe spoke length scale reads spoke-bed-to-spoke-bed distance on common bicycle spokes; the spoke diameter slots cover the standard 1.4 to 2.6 mm range (in 0.1 mm steps) so you can identify an unmarked spoke before reaching for a \u003ca href=\"\/products\/spoke-tension-meter-2-0\"\u003eSpoke Tension Meter 2.0\u003c\/a\u003e lookup table. The bearing diameter holes cover the common hub-bearing diameters from 1\/8\" through 1\/4\". The cotter-pin sizes are the older specification (cotters are a pre-cassette part on legacy three-piece cranksets; the 1629 reads them because some workshops still see them).\u003c\/p\u003e\n\u003cp\u003eA convenient hanging hole in the corner of the tool lets the 1629 live on a pegboard above the bench rather than getting lost in a parts drawer. Small tool, frequent use, no good reason to hide it from sight.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpokes: 1.4 to 2.6 mm in 0.1 mm increments.\u003c\/li\u003e\n\u003cli\u003eBearings: 1\/8\" to 1\/4\" (covers most cup-and-cone hub bearings).\u003c\/li\u003e\n\u003cli\u003eCotter pins: legacy three-piece-crank cotter sizes (pre-cassette work, mostly vintage).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMeasures spoke lengths, spoke diameters, bearing diameters, and cotter sizes.\u003c\/li\u003e\n\u003cli\u003eHanging hole in the tool body for pegboard storage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 1629 is one of the longest-serving designs in the wheelbuilding catalog; a measurement reference doesn't need to evolve faster than the underlying parts do, and bicycle spoke and bearing sizes haven't fundamentally changed in decades. The tool is on most professional wheelbuilders' benches because it's where it has always been.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eThe most common use we put the 1629 to is identifying an unmarked spoke that came out of a customer's wheel. Slide the spoke through the diameter slots until it fits; that's the diameter. Cross-reference that to the \u003ca href=\"\/products\/spoke-tension-meter-2-0\"\u003eSpoke Tension Meter\u003c\/a\u003e lookup table and you have a working KGF target for the rebuild. The rest of the truing workflow is in \u003ca href=\"\/blogs\/tech-tips\/how-to-true-a-bike-wheel\"\u003eHow to true a bike wheel →\u003c\/a\u003e\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":34378798923820,"sku":"620561","price":17.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/1629.jpg?v=1642730018"},{"product_id":"measuring-gauge-for-cutting-guide","title":"Gauge for Steerer Tube Cutting Guide - 1604.1\/2PLUS","description":"\u003cp\u003eA new fork's steerer comes long. The mechanic decides where the cut goes based on the stack height of stem, headset, and any spacers above and below the stem, and the cut has to land square because a steerer cut off-axis means the stem clamps unevenly and the bar twists under load. Getting the cut square is what the saw cutting guide does; getting the cut to the exact right length is what the gauge does. The 1604.1\/2PLUS is the measurement piece that pairs with the saw cutting guide to remove the eyeballing from steerer cuts.\u003c\/p\u003e\n\u003ch2\u003eHow it works\u003c\/h2\u003e\n\u003cp\u003eThe 1604.1\/2PLUS slides onto the Unior steerer-tube saw cutting guide. The cutting guide has a series of saw slots at fixed positions along its length; the gauge attaches to the guide and shows the steerer length corresponding to each slot through measurement windows.\u003c\/p\u003e\n\u003cp\u003eThe mechanic's workflow:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eMount the cutting guide onto the steerer at roughly the target cut height.\u003c\/li\u003e\n\u003cli\u003eSlide the gauge onto the guide.\u003c\/li\u003e\n\u003cli\u003eRead the steerer length through the gauge windows; align the desired length to the corresponding saw slot.\u003c\/li\u003e\n\u003cli\u003eCut through the slot. The blade lands exactly where the gauge said it would.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThe gauge converts the cutting guide from “cut here, somewhere in this slot” to “cut here, at this precise length.” On a new fork install where the stack-height math has been done in advance, that precision is the difference between a clean re-install and a fork that has to come back out for a second cut.\u003c\/p\u003e\n\u003ch2\u003eSpec\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePairing:\u003c\/strong\u003e designed to work with the Unior saw cutting guide for steerer tubes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e measurement reference at each cutting slot\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeometry:\u003c\/strong\u003e windows align with the cutting guide's saw slots\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThe 1604.1\/2PLUS pairs with the Unior saw cutting guide for steerer tubes. The gauge is not a standalone tool; the cutting guide provides the saw blade's working slot, and the gauge provides the measurement reference. Together they make the cut accurate; the gauge alone doesn't cut anything.\u003c\/p\u003e\n\u003ch2\u003eWhen to use it\u003c\/h2\u003e\n\u003cp\u003eThree workflows land a mechanic on this product:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew fork install on a build.\u003c\/strong\u003e The steerer comes long and has to be cut to match the planned stack height.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRe-cut on a refurbished fork.\u003c\/strong\u003e A fork that's lived under one rider and is now going under another may need a longer-or-shorter steerer for the new stack.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame change with a re-used fork.\u003c\/strong\u003e A frame swap that changes the head-tube length changes the required steerer length; the gauge sets the new cut.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 1604.1\/2PLUS is a complement to the cutting guide rather than a competitor with it; the gauge does the measurement work that the cutting guide on its own can't, and the two together cover the full steerer-cut workflow.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eAlways cut the steerer \u003cstrong\u003eafter\u003c\/strong\u003e test-fitting the full stack. The stack-height math should give you the right answer, but spacer compression under bar clamping and stem-internal-clearance assumptions sometimes shift things by a millimeter or two. We test-fit the stem, headset, and spacers without cutting, mark the actual cut line with the gauge, then take everything apart for the cut. A second cut is faster than a steerer that's been cut too short. Where this fits in the headset workflow: \u003ca href=\"\/blogs\/tech-tips\/bearing-and-headset-service\"\u003eBearing and headset service: a workshop guide →\u003c\/a\u003e\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":34378800234540,"sku":"623418","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/1604.1_2plus.jpg?v=1642724991"},{"product_id":"frame-and-fork-end-alignment-gauge-tool","title":"Dropout Alignment Gauges - 1692\/4","description":"\u003cp\u003eThe dropouts are the parts of the frame and fork that the wheel axles seat against. They have to be parallel to each other, perpendicular to the bike's centerline, and free of any twist or splay that would force the wheel to sit cocked in the frame. Misaligned dropouts cause every problem a misaligned wheel causes: poor tracking, brake rub that won't dial out, shifting that goes sloppy as the chain works against an off-axis cassette, and excessive wear at the hub bearings as the cones load unevenly. The Dropout Alignment Gauges 1692\/4 are the bench tools that catch the problem and (within reason) correct it.\u003c\/p\u003e\n\u003ch2\u003eWhat the tools do\u003c\/h2\u003e\n\u003cp\u003eThe 1692\/4 is a paired set of gauges that install into both the rear-frame dropouts and the front-fork dropouts. Each gauge threads or clamps into the dropout the same way an axle would, and presents a precisely-machined flat face. Bring the two faces together and the gap between them shows you exactly how the dropouts relate: parallel and square if the faces meet flush, splayed or twisted if they don't.\u003c\/p\u003e\n\u003cp\u003eFor minor misalignment on steel frames, the gauges themselves provide the leverage to correct the bend. Apply pressure to the gauge handles in the direction the dropout needs to move; the gauge's seat distributes the bend evenly along the dropout's length. Re-measure after correction; iterate if needed.\u003c\/p\u003e\n\u003ch2\u003eWhere you can use them, where you can't\u003c\/h2\u003e\n\u003cp\u003eSteel frames respond well to dropout correction; the material yields cleanly under controlled bending force, and the correction holds. Aluminum is riskier (consult the frame maker; cold-set bending can stress the alloy past its yield point). Carbon doesn't bend at all; carbon dropouts break, and a misaligned carbon dropout means a frame return, not a correction. Titanium responds to bending but its elastic recovery is high enough that correction usually wants specialist work. The 1692\/4 are diagnostic tools first, correction tools second; the diagnostic value applies to every frame material.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eOperation: paired gauges, installed into front and rear dropouts\u003c\/li\u003e\n\u003cli\u003eCompatibility: most modern frame and fork dropouts (verify with your frame for thru-axle vs. QR fitments)\u003c\/li\u003e\n\u003cli\u003eFrame material correction: steel yes, aluminum sometimes, carbon no, titanium consult manufacturer\u003c\/li\u003e\n\u003cli\u003ePairs with the \u003ca href=\"\/products\/hanger-genie\"\u003eHanger Genie 1602\/2\u003c\/a\u003e and \u003ca href=\"\/products\/hanger-genie-2-0-hanger-alignment-tool\"\u003eHanger Genie 2.0\u003c\/a\u003e for full rear-end-true workflow\u003c\/li\u003e\n\u003cli\u003eMade in Slovenia by Unior\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e Paired dropout alignment gauges.\u003c\/p\u003e\n\u003ch2\u003eMade in Slovenia, since 1919\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 1692\/4 is the tool the workshop reaches for when a bike's shift quality, brake feel, or tracking can't be explained by the obvious adjustments. The pairing with the Hanger Genie is the canonical Unior workshop completeness: dropouts first, hanger second, drivetrain third. The 1692\/4 lives on the bench between those steps.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eRun the dropout gauges on every shop-built wheel before you ship a wheelbuild. A wheel that's perfect in the truing stand and then gets installed in a frame with splayed dropouts arrives at the customer behaving as if the wheel itself was the problem. The gauge takes five minutes; the recovery from a wrong-diagnosis warranty claim takes longer.\u003c\/p\u003e\n\u003cp\u003eIf you're chasing the why behind a bent hanger that keeps coming back bent, the gauges are also where to start; sometimes the hanger isn't the issue, the dropout the hanger threads into is. The full diagnostic-and-correction context for rear-end alignment is in our Tech Tips: \u003ca href=\"\/blogs\/tech-tips\/how-to-save-a-bent-mech-hanger\"\u003eHow to save a bent mech hanger →\u003c\/a\u003e\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":34378801381420,"sku":"618412","price":101.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/files\/Dropout-Alignment-Gauges.jpg?v=1732111612"},{"product_id":"vernier-caliper-271","title":"Vernier Caliper, 0-150mm - 271","description":"\u003cp\u003eA precision instrument that doesn't depend on electronics has a specific role in a working shop: the kind of measurement that has to happen anywhere on the bike, at any time of day, after the digital caliper's battery has died or the digital has been dropped on the concrete floor. The 271 Vernier Caliper is that instrument. Made to DIN 862 with 0.02 mm \/ 0.001 in accuracy on a dual millimeter-and-inch vernier scale; trivalent chrome plated, and immune to the battery and drop-failure modes of a digital instrument.\u003c\/p\u003e\n\u003cp\u003eThe 271 reads 0–150 mm (0–6 in) with the standard vernier scale: a main scale on the body and a secondary scale on the sliding jaw. Official accuracy is 0.02 mm \/ 0.001 in. Once you've learned to read a vernier (30 seconds the first time), the reading is faster than a digital; your eye registers the alignment, not a digital readout that has to update.\u003c\/p\u003e\n\u003cp\u003eThe beam is marked STAINLESS HARDENED and the finish is trivalent chrome. There is no battery. Drop it on the bench and the analog scale is still there; a digital caliper dropped the same way often is not.\u003c\/p\u003e\n\u003ch2\u003eWhen you'll reach for the analog instead of the digital\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFor road kit and bike-fitting work where the caliper has to travel and survive\u003c\/li\u003e\n\u003cli\u003eWhen the digital's battery is dead and you don't have a spare nearby\u003c\/li\u003e\n\u003cli\u003eFor students or new mechanics learning to use a caliper; the analog teaches the underlying measurement, the digital lets you skip past it\u003c\/li\u003e\n\u003cli\u003eFor long-life kit assembly where one instrument has to last decades\u003c\/li\u003e\n\u003cli\u003eWhen you need official DIN 862 accuracy of 0.02 mm \/ 0.001 in with no battery in the circuit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBoth the 271 and the \u003ca href=\"\/products\/digital-vernier-0-150mm\"\u003eDigital Vernier Caliper 270A\u003c\/a\u003e cover the same measurements; they live in different parts of the working day. Most working shops own both. The analog's quiet reliability is the reason it stays in the toolkit even after the digital becomes the everyday default.\u003c\/p\u003e\n\u003ch2\u003eWhat it measures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRotor thickness against manufacturer's published minimum\u003c\/li\u003e\n\u003cli\u003eAxle outer diameter when sourcing matching seals\u003c\/li\u003e\n\u003cli\u003eHead-tube ID at two perpendicular axes (ovalization check)\u003c\/li\u003e\n\u003cli\u003eSteerer outer diameter at sleeved vs. unsleeved sections\u003c\/li\u003e\n\u003cli\u003eCassette spacer thickness during axle-spacing conversions\u003c\/li\u003e\n\u003cli\u003eSpoke length verification (with depth jaw extended)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSame measurement use cases as the digital, with a slower workflow but a more durable instrument.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e0–150 mm \/ 0–6 in range\u003c\/li\u003e\n\u003cli\u003e0.02 mm \/ 0.001 in accuracy (DIN 862)\u003c\/li\u003e\n\u003cli\u003eDual scale: millimeters and inches\u003c\/li\u003e\n\u003cli\u003eTrivalent chrome plated; beam marked STAINLESS HARDENED\u003c\/li\u003e\n\u003cli\u003eInternal, external, depth, and step measurement\u003c\/li\u003e\n\u003cli\u003eArticle 271 · SKU 612035 · length 235 mm · jaw height 40 mm · 240 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 271 is part of Unior's broader precision-measurement catalog. The 270A digital sibling publishes the same 0.02 mm \/ 0.001 in accuracy and DIN 862 standard; the 271 is the analog, battery-free member of that pair.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eA working shop that hands a new mechanic the analog 271 before the digital 270A is doing the new mechanic a favor. Once the analog reading is second-nature, the digital is faster but not more accurate; once the digital is the only instrument the new mechanic has used, the analog feels like a barrier. Start analog, add digital later. Our \u003ca href=\"\/blogs\/tech-tips\/workshop-hand-tools-every-bike-shop-needs\"\u003eworkshop hand tools guide\u003c\/a\u003e covers measurement tools and the rest of the workshop hand-tool layer: \u003ca href=\"\/blogs\/tech-tips\/workshop-hand-tools-every-bike-shop-needs\"\u003eWorkshop hand tools every bike shop needs →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat range and accuracy does the 271 vernier caliper have?\u003c\/strong\u003e Official range is 0–150 mm and 0–6 in on a dual millimeter-and-inch scale. Unior publishes accuracy of 0.02 mm \/ 0.001 in, and the 271 is made to DIN 862.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat can the 271 measure on a bike?\u003c\/strong\u003e Official functions are internal dimensions, external dimensions, depth, and steps. That covers rotor thickness, axle and steerer OD, head-tube ID, spacer stacks, and spoke length with the depth rod.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is the analog 271 different from the digital 270A?\u003c\/strong\u003e Both publish the same 0.02 mm \/ 0.001 in accuracy, DIN 862, 0–150 mm \/ 0–6 in range, and the same four measuring functions. The 271 is analog (no battery, 240 g). The 270A is the digital sibling (460 g, 1-year official warranty). They are separate instruments, not a spare for each other.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the official size, finish, and markings?\u003c\/strong\u003e Length 235 mm, jaw height (B) 40 mm, 240 g. Finish is trivalent chrome plated. The beam on the official product photo is marked STAINLESS HARDENED. Article 271, SKU 612035.\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":34378813931564,"sku":"612035","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/271_612035.png?v=1667851590"},{"product_id":"701-feeler-gauges","title":"Feeler Gauges - 701","description":"\u003cp\u003eA feeler gauge set lives in the toolbox until the day you need it, and then it's the only tool that does the job. Setting a SRAM front derailleur to manufacturer-spec gap requires a feeler gauge. Verifying that a brake-caliper-to-rotor gap matches Shimano's spec requires a feeler gauge. Measuring the gap in a stuck bearing race before you commit to the puller requires a feeler gauge.\u003c\/p\u003e\n\u003cp\u003eThe set is 13 gauges from 0.05 mm to 1 mm. That range covers every measurement spec you'll see in a modern bike service manual. SRAM's front-derailleur outer-cage gap is 1.0 mm. Shimano's pad-to-rotor minimum is around 0.3 mm. Bearing-race wear shows up as gaps in the 0.05–0.15 mm range. Each gauge is a steel blade with the size etched into the handle, hinged at one end so the whole set fans out from a single hub.\u003c\/p\u003e\n\u003cp\u003eThe gauges are flat-ground steel, not stamped. Stamped gauges deflect under finger pressure and read shorter than nominal; ground gauges hold the etched dimension. The pressure on the gauge matters: a gauge that pushes in with light resistance is the right size. A gauge that snags is too thick. A gauge that drops through is too thin.\u003c\/p\u003e\n\u003ch2\u003eWhen you'll reach for them\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSetting SRAM front-derailleur outer-cage gap (per the manual's spec for the specific derailleur)\u003c\/li\u003e\n\u003cli\u003eChecking brake-pad-to-rotor clearance against the brake manufacturer's published minimum\u003c\/li\u003e\n\u003cli\u003eMeasuring bearing race wear before deciding whether to re-grease or replace\u003c\/li\u003e\n\u003cli\u003eSetting valve clearances on internal-combustion engines (the gauges aren't bike-specific; they cover any feeler-gauge work)\u003c\/li\u003e\n\u003cli\u003eQuickly checking whether a stuck rotor bolt has any clearance to a backing plate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e13 gauges, 0.05 mm to 1 mm\u003c\/li\u003e\n\u003cli\u003eFlat-ground steel blades\u003c\/li\u003e\n\u003cli\u003eArticle number: 701\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. Feeler gauges are a general workshop tool, not bike-specific, but the manufacturing quality matters: gauges that read true the first time save the trial-and-error of trying three blades to find the right one. The 701 set is part of the same hand-tools line that the cycling catalog draws from.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eA SRAM front derailleur with the wrong outer-cage gap will ghost-shift under load even when the indexing is perfect. The clearance spec is in the manual; the feeler gauge is what makes the spec usable. Our \u003ca href=\"\/blogs\/tech-tips\/workshop-hand-tools-every-bike-shop-needs\"\u003eworkshop hand tools guide\u003c\/a\u003e covers the measurement tools and other workshop fundamentals that quietly carry half the daily work: \u003ca href=\"\/blogs\/tech-tips\/workshop-hand-tools-every-bike-shop-needs\"\u003eWorkshop hand tools every bike shop needs →\u003c\/a\u003e\u003c\/p\u003e","brand":"Unior","offers":[{"title":"0.05 - 1mm, 13pcs","offer_id":39563816828972,"sku":"601897","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/701.png?v=1642713765"},{"product_id":"sprocket-wear-indicator-1658-2p-us","title":"Sprocket Wear Indicator - 1658\/2P","description":"\u003cp\u003eA cassette can wear out without any single cog looking obviously bad. The teeth don't break or visibly bend; they get reshaped; under-cut on the trailing edge, hooked on the leading edge; by a chain that's been ridden past its replacement point. The chain gets replaced, the new chain doesn't fit the reshaped teeth, and the bike skips under load on the cogs the rider uses most. The Sprocket Wear Indicator 1658\/2P is the gauge that catches the cassette before the next chain.\u003c\/p\u003e\n\u003cp\u003eThe tool is a chrome-plated steel bar with a calibrated length of chain attached to it. The chain drapes over a cog; the tip of the steel bar plants in the next tooth valley; you apply about 100 N of force (10 kg \/ 22 lb) to the end of the bar and try to press the last link down into a third tooth valley. If the link drops in easily, the cog still has the geometry a new chain expects; the cassette is in its service window. If the link sits high and resists pressing into the valley, the cog teeth have been reshaped enough that fresh chain won't seat properly; the cassette is done.\u003c\/p\u003e\n\u003cp\u003eIt's a 30-second check per cog. We typically read the middle three or four cogs on a road cassette and the climbing cogs on an MTB cassette; the ones the rider actually loads under power. The first cog to fail is the first one they've been hammering.\u003c\/p\u003e\n\u003ch2\u003eHow to read it\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eRemove the chain from the cassette (or just shift the bike's chain off the cassette onto the chainstay clip).\u003c\/li\u003e\n\u003cli\u003eDrape the gauge's chain segment over the cog you want to read. Land the chrome bar's tip in the tooth valley directly next to the chain's last link.\u003c\/li\u003e\n\u003cli\u003eMake sure the very last link of the gauge chain is \u003cem\u003enot\u003c\/em\u003e yet touching the cog; that's the link you're going to press down.\u003c\/li\u003e\n\u003cli\u003ePress the last link down toward the third tooth valley with about 100 N (10 kg) of force at the end of the bar.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eIf the link drops in: the cog is still good. If it resists and sits high: the cog is past its window. Repeat on the next cog. Any cog that fails the read (the link can't reach the valley) is worn past Unior's replace point; plan a cassette replacement.\u003c\/p\u003e\n\u003cp\u003eThe 1658\/2P is paired with the \u003ca href=\"\/products\/chain-wear-indicator-1644-6\"\u003eChain Wear Indicator 1644\/6\u003c\/a\u003e as a complete drivetrain-wear toolkit. The chain indicator catches the chain at 0.5% or 0.75% elongation depending on speed; the 1658\/2P catches the cassette wear that resulted from running the chain too long.\u003c\/p\u003e\n\u003ch2\u003eWhen to read your cassette\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAfter every chain replacement, before installing the fresh chain\u003c\/li\u003e\n\u003cli\u003eBefore a planned cassette change, to confirm the cassette is actually due\u003c\/li\u003e\n\u003cli\u003eAny time the bike skips under load on specific cogs with a new chain\u003c\/li\u003e\n\u003cli\u003eDuring seasonal service or whenever the rider reports drivetrain feel changing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for HG and IG sprockets (standard derailleur-cassette tooth geometry)\u003c\/li\u003e\n\u003cli\u003eReads 12- through 21-tooth sprockets (the calibrated range)\u003c\/li\u003e\n\u003cli\u003eReads with the cassette mounted on the wheel\u003c\/li\u003e\n\u003cli\u003eThe read force is hand pressure — about 100 N (10 kg); no torque wrench needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eChrome-plated steel bar with calibrated chain segment; 270 mm long, 77 g\u003c\/li\u003e\n\u003cli\u003e~100 N (10 kg) reference force for the gauge read\u003c\/li\u003e\n\u003cli\u003ePairs with chain-wear gauge for full drivetrain monitoring\u003c\/li\u003e\n\u003cli\u003eArticle number: 1658\/2P\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 1658\/2P is the diagnostic tool that closes the drivetrain-wear loop. Chain-wear gauges have become standard in workshops over the last decade; the cassette equivalent is less common, partly because the visual check (look at the teeth) is misleadingly easy to fall back on. The 1658\/2P gives you a yes-or-no answer in less time than the visual check takes, and the answer is right.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eMost home mechanics replace the chain on time and skip the cassette read; the bike skips under load with the new chain, and the cassette gets replaced anyway, but with a frustrated trip back to the shop. Reading the cassette before installing the fresh chain; 90 seconds across the loaded cogs; saves that second trip. The cassette-replacement workflow has more on when each tool reads what: \u003ca href=\"\/blogs\/tech-tips\/when-and-how-to-replace-your-cassette\"\u003eWhen and how to replace your cassette →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhich cassettes does the 1658\/2P work with?\u003c\/strong\u003e Unior specifies HG and IG sprockets from 12 to 21 teeth — the standard tooth geometry on derailleur cassettes. The check is per-cog, so you read each sprocket individually with the cassette still mounted on the wheel.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow much force do I apply during the check?\u003c\/strong\u003e About 100 N — roughly 10 kg or 22 lb of hand pressure — applied to the tool in the direction of sprocket rotation. It's a by-feel push, not a torque setting, so no torque wrench is involved.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I tell a good cog from a worn one?\u003c\/strong\u003e If the last chain link skips easily down onto the cog, the sprocket is in good condition and will run flawlessly even with a new chain. If the link sticks on the tip of the neighbouring tooth or has to be forced, the sprocket is worn out and should be replaced. If the chain falls off the cog while you apply force, the sprocket is heavily worn and replacement is overdue.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the tool made of?\u003c\/strong\u003e A premium flex plus carbon steel bar, trivalent chrome plated to ISO 1456:2009, with a calibrated chain segment attached. The tool is 270 mm long, weighs 77 g, and carries Unior's lifetime warranty.\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":41189169463340,"sku":"629230","price":24.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/files\/Sprocket-Wear-Indicator.jpg?v=1732110491"},{"product_id":"chain-wear-indicator-1644-6","title":"Chain Wear Indicator - 1644\/6","description":"\u003cp\u003eA chain doesn't tell you it's worn. It elongates a few thousandths of a millimeter at every pin, and by the time the cassette starts skipping under load the damage is already done. The Chain Wear Indicator 1644\/6 is the small tool that catches the moment before that happens. Drop it into the chain, push down gently, and the gauge gives you a yes-or-no answer in about three seconds.\u003c\/p\u003e\n\u003cp\u003eThe reason this one reads the chain honestly is the three-point geometry. Most wear gauges register pin-to-pin distance and call it elongation, but a chain with worn-out rollers and tight pins reads false-positive on a two-point tool: the rollers sit loose against the gauge, and the gauge drops in. The 1644\/6 uses a three-point design that isolates pin elongation from roller wear, so the reading reflects the actual chain-stretch number rather than the sloppier proxy.\u003c\/p\u003e\n\u003ch2\u003eHow to read it\u003c\/h2\u003e\n\u003cp\u003eTwo thresholds are stamped on the tool, one at each end:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.5% side\u003c\/strong\u003e for \u003cstrong\u003e11-, 12-, and 13-speed\u003c\/strong\u003e chains. Modern narrow-spaced chains start damaging the cassette before they hit 0.75%, so the replacement trigger moves earlier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.75% side\u003c\/strong\u003e for \u003cstrong\u003e6- through 10-speed\u003c\/strong\u003e chains. The wider cog spacing gives the chain a little more room before the deformation cascade starts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf the 0.5% side drops in on an 11-speed chain, the chain goes. If the 0.75% side drops in on a 9-speed chain, same call. If neither drops in, the chain is still inside its service window. A QR code on the body links to a usage video for the moments when the answer feels closer than that.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eEvery 6- to 13-speed derailleur chain in current production, including SRAM AXS flat-top chains. The three-point design is geometry-agnostic; what differs across speeds is the threshold to read against, not the way the tool sits in the chain.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e6-13 speed derailleur chains; SRAM flat-top\u003c\/li\u003e\n\u003cli\u003ePrecision laser-cut steel\u003c\/li\u003e\n\u003cli\u003e178 × 45 × 29.4 mm\u003c\/li\u003e\n\u003cli\u003e20 g\u003c\/li\u003e\n\u003cli\u003eArticle number: 1644\/6\u003c\/li\u003e\n\u003cli\u003eQR code with video usage instructions printed on the body\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The dual-threshold pair stamped on the 1644\/6 matches what current chain manufacturers publish for narrow-spaced and legacy drivetrains; the three-point geometry is the design call that makes the tool useful at both ends. It's a small piece of laser-cut steel that does one job, and it does it more accurately than the gauge in the bottom of your toolbox.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eThe 0.5% vs. 0.75% split is where most home mechanics get the call wrong; the older single-threshold gauges are calibrated to swap a chain \u003cem\u003elater\u003c\/em\u003e than a modern 11- or 12-speed drivetrain wants. The 1644\/6 reads the right threshold for the right chain, but knowing which threshold applies to which bike is the part that's not on the tool. Our chain-replacement guide covers when each threshold applies, what's happening to the cassette teeth in the gap between them, and how to break and reinstall cleanly once the call is made: \u003ca href=\"\/blogs\/tech-tips\/when-and-how-to-replace-your-chain\"\u003eWhen and how to replace your chain →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAt what wear point should a SRAM 12-speed chain be replaced?\u003c\/strong\u003e Like all 11-, 12-, and 13-speed chains, SRAM 12-speed chains (flat-top included) are read against the 1644\/6's 0.5% end; the moment that side drops into the chain, the chain is due. The 0.75% end is for 6- to 10-speed drivetrains only.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the 1644\/6 carry both a 0.5% and a 0.75% threshold?\u003c\/strong\u003e Each end matches a drivetrain generation. Narrow-spaced 11- to 13-speed chains begin damaging the cassette before 0.75%, so their replacement trigger moves up to 0.5%, while 6- to 10-speed chains get enough room from their wider cog spacing to run to 0.75%.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does a three-point chain checker measure that a two-point gauge misses?\u003c\/strong\u003e The difference is what the gauge touches. Resting on two points, a checker can be fooled by loose rollers into condemning a chain whose pins are still tight; the third contact point takes the rollers out of the reading, so what's left is genuine elongation at the pins.\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":41522029854764,"sku":"629344","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/files\/Chain-wear-indicator-Square.jpg?v=1723632449"},{"product_id":"rotor-wear-indicator","title":"Rotor Wear Indicator","description":"\u003cp\u003eA disc rotor wears thinner over service life. The brake pad slowly removes metal at the wear track, and the rotor crosses its manufacturer-published minimum thickness somewhere between two and four years of regular use (depending on rider weight, terrain, pad compound, and how much the brakes get dragged). Past that minimum, the rotor is below safe service spec and needs replacement. The Rotor Wear Indicator is the laser-cut gauge that tells you whether a rotor is still inside the safe window or has crossed it.\u003c\/p\u003e\n\u003cp\u003eThe gauge has six precision laser-cut slots: 1.5 mm, 1.55 mm, 1.7 mm, 1.8 mm, 2.0 mm, and 2.3 mm. Each slot is sized to the published minimum thickness used by the most common disc-brake rotor manufacturers for that rotor's class. The etched labels pair each slot with its rotor family: 1.5 mm for Shimano and Hope, 1.55 mm for SRAM CL, 1.7 mm for SRAM HS2, 1.8 mm for Magura, 2.0 mm for TRP and Tektro, and 2.3 mm for Magura MDR-S 2.5. Fit a slot over the rotor's wear track. If the rotor does not pass into the slot, the rotor is still above that minimum and within service. If the rotor does pass into the slot, the rotor has reached or fallen below that minimum and should be replaced. Always check the minimum thickness specification stamped on the rotor or printed in the manufacturer's service documentation; the gauge's slots cover the range of common minimums, but the specific rotor's spec is the authoritative number.\u003c\/p\u003e\n\u003cp\u003eThe gauge is a go\/no-go reading rather than a thickness measurement. You don't need a digital number to know whether a rotor is past spec; you need a fast yes-or-no at intake. The QR code on the gauge body links to a video walkthrough that covers the wear-track-versus-edge distinction (only the rotor face the pads actually contact is the right place to measure).\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFunction: go\/no-go gauge for disc-brake rotor thickness\u003c\/li\u003e\n\u003cli\u003eSix laser-cut measuring slots: 1.5 mm, 1.55 mm, 1.7 mm, 1.8 mm, 2.0 mm, 2.3 mm\u003c\/li\u003e\n\u003cli\u003eSlot logic: if the rotor passes into the slot, it's at or below that minimum thickness\u003c\/li\u003e\n\u003cli\u003eQR code linking to step-by-step video guide\u003c\/li\u003e\n\u003cli\u003eIntegrated hanging hole\u003c\/li\u003e\n\u003cli\u003eWeight: 55 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. Laser-cut gauges are the construction-process where the cut surface itself is the working face of the tool, which is why this gauge holds the published minimums as a reference dimension rather than a printed marking that wears off. The same construction approach is used on the chain-wear gauges in the Unior catalog; the geometry differs but the precision principle is the same.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eMeasure the rotor before you decide to true it. A rotor that's already below the manufacturer's wear limit is past saving by truing; pulling on a fatigued rotor with a fork bends grain that's no longer uniform and risks a fatigue crack at the next big braking input. The wear check is also worth doing on every brake service intake, because thickness wear is silent until it isn't, and a customer who's about to leave with a rotor at 1.45 mm doesn't know it. Our disc-brake-rub guide walks the diagnostic order that puts measurement before action, so the truing fork comes out only when the rotor is worth truing: \u003ca href=\"\/blogs\/tech-tips\/fix-disc-brake-rub\"\u003eFix disc brake rub →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow do you measure disc rotor wear?\u003c\/strong\u003e Check the wear track (the band the pads actually touch), never the rotor's outer edge. Fit the matching gauge slot over the track: a rotor that enters the slot is at or under that minimum thickness and needs replacing, and the spec stamped on your rotor is the authoritative number.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich minimum thicknesses do the six slots cover?\u003c\/strong\u003e The slots are laser-cut at 1.5, 1.55, 1.7, 1.8, 2.0, and 2.3 mm, matching the published minimums the most common disc rotor manufacturers use for each rotor class.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this a thickness measurement tool or a go\/no-go gauge?\u003c\/strong\u003e It's a go\/no-go gauge: each slot gives a yes-or-no answer against one published minimum rather than a numeric reading, which is the fast check a service intake needs. A QR code on the body opens a video showing the technique, including why you measure at the wear track rather than the rotor edge.\u003c\/p\u003e","brand":"Unior USA","offers":[{"title":"Default Title","offer_id":44804662034476,"sku":"629994","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/files\/Rotor-Wear-Indicator.jpg?v=1769079491"},{"product_id":"spoke-tension-meter-2-0","title":"Spoke Tension Meter 2.0","description":"\u003cp\u003eA wheel that's true on the stand but unevenly tensioned will go right back out of true under the first hard ride. The Spoke Tension Meter 2.0 is the gauge that closes the gap, reading the working tension in every spoke so the side-to-side balance can be set before the wheel leaves the bench.\u003c\/p\u003e\n\u003cp\u003eThe 2.0 is a redesign of the proven \u003ca href=\"\/products\/spoke-tension-meter-17522\"\u003eSpoke Tension Meter 1752\/2\u003c\/a\u003e with three changes that matter on the bench:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003eBearing contact points\u003c\/em\u003e at the spoke. The 2.0's redesigned head replaces the previous-generation sliding contact with bearings at each spoke-contact area, which improves measurement accuracy and lets the same wheel read the same value pass after pass. Repeatability is what separates a meter that informs the build from one that's a check.\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eCalibration stick included with the tool.\u003c\/em\u003e Each Spoke Tension Meter 2.0 ships with its own calibration stick; the same stick used during the meter's factory calibration. Press the handle, insert the stick, adjust the spring until the reading matches the value marked on the stick. The recalibration takes seconds and can be done on the bench any time the meter feels like it's drifting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eBlack surface finish\u003c\/em\u003e on the body. The black-body update reads more cleanly under workshop lighting than the previous silver finish.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA built-in spoke-diameter gauge sits on the body of the tool; insert any spoke in the top openings to identify its thickness, which is the value you use to look up the kilogram-force in the Unior Wheel Tension App and printable tension sheet. The app converts the dial reading to KGF, lets you record per-spoke values for the build, and prints a one-page tension sheet you can hand to a customer at the end of a build.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpokes: round and bladed spokes; identify the diameter with the built-in gauge, then read tension against the app's conversion tables.\u003c\/li\u003e\n\u003cli\u003eSizes: the Wheel Tension App tables cover round spokes from 1.4 to 2.34 mm and bladed spokes from 0.9 x 1.8 mm to 1.3 x 2.8 mm.\u003c\/li\u003e\n\u003cli\u003eThe Unior Wheel Tension App at \u003ca href=\"https:\/\/spoketension.uniortools.com\"\u003espoketension.uniortools.com\u003c\/a\u003e converts dial readings to KGF.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFactory-calibrated and ready out of the box; calibration stick included for recalibration.\u003c\/li\u003e\n\u003cli\u003eBearing contact points at the spoke for accuracy and repeatability.\u003c\/li\u003e\n\u003cli\u003eBuilt-in spoke-diameter gauge for sizing.\u003c\/li\u003e\n\u003cli\u003eQR-code on the body linking to the Unior Wheel Tension App.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuilt in Zreče, Slovenia\u003c\/h2\u003e\n\u003cp\u003eUnior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 2.0 reflects a workshop-driven set of choices: bearings instead of sliding contact, a calibration stick individually matched to the tool during its factory calibration, an app that lets the mechanic build a record per wheel. Each is a small improvement; together they're the difference between a tension meter that's a once-a-year tool and one that's on the bench every build.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eRead tension at the same handle-pressure on every spoke. The meter's spring is the reference, and applying it consistently is the difference between a tension band that's actually 10–15% and one that's 20% but reads as 10%. We press the handle to a stop, take the reading, release; the rhythm becomes muscle memory after a hundred spokes and the per-spoke variability collapses to the wheel's real tension distribution rather than the operator's. The rest of the wheel-truing workflow is in \u003ca href=\"\/blogs\/tech-tips\/how-to-true-a-bike-wheel\"\u003eHow to true a bike wheel →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat spoke sizes and shapes can the Spoke Tension Meter 2.0 measure?\u003c\/strong\u003e It reads round and bladed spokes. The Unior Wheel Tension App's conversion tables cover round spokes from 1.4 to 2.34 mm and bladed spokes from 0.9 x 1.8 mm to 1.3 x 2.8 mm. If you are unsure of a spoke's diameter, the gauge built into the top of the body identifies it before you look up the tension.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I calibrate the Spoke Tension Meter 2.0?\u003c\/strong\u003e It arrives factory-calibrated and ready to use. Every meter also ships with its own calibration stick — the exact stick used during that meter's factory calibration. To recalibrate, press the handle, insert the stick, and adjust the spring until the reading matches the value marked on the stick; the process takes seconds. Keep the stick in the case and use it only with this meter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between the Spoke Tension Meter 2.0 and the original 1752\/2?\u003c\/strong\u003e Three changes: bearing contact points at the spoke improve measurement accuracy and repeatability, the black body finish makes the etched scale easier to read, and a QR code on the tool links straight to the Unior Wheel Tension App for kilogram-force conversion. Both generations ship with a calibration reference and a built-in spoke-diameter gauge.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Spoke Tension Meter 2.0 and are spare parts available?\u003c\/strong\u003e The tool measures 205 x 135 x 37 mm and weighs 682 g, and it arrives seated in a foam-lined case alongside its calibration stick. Unior lists a replacement spring (model 1752.1) as the serviceable spare part for the meter.\u003c\/p\u003e","brand":"Unior USA","offers":[{"title":"Default Title","offer_id":45406585880620,"sku":"629939","price":119.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/files\/1752_6_629939_image_1024.jpg?v=1775053725"}],"url":"https:\/\/uniorusa.com\/collections\/measuring-tools.oembed","provider":"Unior USA","version":"1.0","type":"link"}