{"title":"Spare Parts","description":null,"products":[{"product_id":"chain-tool-pins","title":"Replacement Chain Tool Pins - 1647.1\/4A","description":"\u003cp\u003eThe pin is the part of a chain tool that wears. The body lasts, the spindle threads hold up, the handle keeps its grip; the driving pin takes the load of every chain break and eventually mushrooms at the tip or develops a slight bend. When it does, the pin starts to push off-center, the chain plate deforms, and the chain tool stops being precision equipment.\u003c\/p\u003e\n\u003cp\u003eThe Replacement Chain Tool Pins 1647.1\/4A are the fix. Two pins per set, sized and finished to factory spec, and you swap them in instead of replacing the whole tool. Lifetime warranty backs the parts.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThe 1647.1\/4A pins fit two tools in the catalog:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/pro-chain-tool\"\u003ePro Chain Tool 1647\/2ABI\u003c\/a\u003e; the workshop screw-type, primary use case for daily chain-break benches.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/master-chain-tool\"\u003eMaster Chain Tool 1647\/2BBI\u003c\/a\u003e; the modular-insert workshop tool, where the pin sees the most varied work across chain standards.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBuy a set ahead when you start to see the pin tip taking visible deformation under a 10× loupe, or after you've broken a few hundred chains on a busy bench. The replacement is something a shop plans for, not a panic part.\u003c\/p\u003e\n\u003ch2\u003eWhen to swap the pin\u003c\/h2\u003e\n\u003cp\u003eA pin that's still doing its job pushes a chain pin out on-axis through the entire stroke. A worn pin starts to wander: the chain pin enters the outer plate at a slight angle, the plate distorts at the rim of the hole, and the reinstalled link won't pivot cleanly. If you start to see the outer plate showing a faint elongation at the pin hole on a freshly-broken chain, the chain tool's pin is the cause, not the chain. Swap the pin, the problem goes away.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSet of 2 pins\u003c\/li\u003e\n\u003cli\u003ePin diameter: 3.4 mm (with secondary 4 mm stepped section) × 24 mm length\u003c\/li\u003e\n\u003cli\u003e10 g per set\u003c\/li\u003e\n\u003cli\u003eCompatible with Unior 1647\/2ABI (Pro Chain Tool) and 1647\/2BBI (Master Chain Tool)\u003c\/li\u003e\n\u003cli\u003eLifetime warranty\u003c\/li\u003e\n\u003cli\u003eArticle number: 1647.1\/4A\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. Selling replacement parts for a tool that's been in production for years is the half of the catalog people don't see: it's how a workshop tool stays a workshop tool. Buy the chain tool once, replace the pin when it wears, keep using the same body for the next decade.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eIf you're not sure whether the chain plate damage is from the chain or from the chain tool, break one outer plate at a fresh location and inspect: clean push means the chain tool is fine, off-center push means the pin needs replacing. Our chain-replacement guide walks through diagnosing the difference between chain-side and tool-side break problems, plus the routing details that prevent the wrong-plate-deformation issue from happening in the first place: \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\u003eWhich Unior chain tools do the 1647.1\/4A pins fit?\u003c\/strong\u003e The two workshop chain tools Unior lists for this spare: the Pro Chain Tool 1647\/2ABI and the Master Chain Tool 1647\/2BBI. Unior names both tools in the part's official title, and both tools' own spec sheets list 1647.1\/4A as their replacement pin.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the replacement pins?\u003c\/strong\u003e Each pin is 24 mm long with a 3.4 mm working tip and a 4 mm stepped section that seats in the tool body. The set contains two pins and weighs 10 g. The dimension drawing on this page shows where each measurement sits on the pin.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know when the pin in my chain tool needs replacing?\u003c\/strong\u003e Watch the tip. A worn driving pin mushrooms or takes a slight bend, and then it starts pushing chain pins through at an angle instead of on-axis — you'll see the chain's outer plate deform around the pin hole on a fresh break. Swap the pin at the first sign of tip deformation and the tool goes back to pushing straight.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo the pins come singly or as a set, and what warranty applies?\u003c\/strong\u003e The 1647.1\/4A is a set of two pins, so a workshop keeps one in the tool and one in the drawer. Like Unior's tools, the pins carry a lifetime warranty.\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":34378795253804,"sku":"621734","price":2.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/1647.1_4a.jpg?v=1642728416"},{"product_id":"spring-for-nipple-install-tool","title":"Spring for Nipple Insertion Tool - 1751.1\/7T","description":"\u003cp\u003eThe springs that keep the \u003ca href=\"\/products\/nipple-assembly-tool-17512t\"\u003eNipple Insertion Tool 1751\/2T\u003c\/a\u003e's grip mechanism working fail eventually. Workshop tools used through hundreds of build sessions accumulate metal fatigue, and the spring is the wear part. These replacement springs come as a pack of five; enough to keep the insertion tool functional through the rest of its working life.\u003c\/p\u003e\n\u003cp\u003eThe 1751.1\/7T springs are dimensioned specifically for the 1751\/2T insertion tool's grip mechanism. A spring from a different tool won't engage the geometry correctly, and the grip will either be too weak (the nipple drops) or too strong (the tool won't release the nipple after the spoke is threaded in).\u003c\/p\u003e\n\u003cp\u003eReplacement is straightforward: pop the old spring out of the tool body, push the new one in, test the grip on a sample nipple. The tool returns to working order with a few minutes of bench work, no service appointment needed.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTool: \u003ca href=\"\/products\/nipple-assembly-tool-17512t\"\u003eNipple Insertion Tool 1751\/2T\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003ePack: 5 springs per unit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpring: dimensioned for the 1751\/2T grip mechanism.\u003c\/li\u003e\n\u003cli\u003eQuantity: 5 per pack.\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. Selling replacement springs for the 1751\/2T is the kind of accessory decision that reflects how Unior tools are designed: as service-able workshop equipment, not as disposable consumer goods. A spring is a wear part; the rest of the 1751\/2T outlasts many of those springs. Letting the customer keep the tool in service indefinitely (rather than replacing the whole insertion tool) is the workshop-friendly choice.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eWhen the 1751\/2T starts feeling like it's dropping nipples more often, replace the spring before the next build session. The spring degrades gradually; the symptom isn't “it broke,” it's “I'm noticing the nipple slips more than it used to.” Five springs is enough to last most workshops several years of regular use; we keep ours in the same drawer as the insertion tool itself, so the replacement is a two-minute job when the need arises. The full wheel-building 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 tool does the 1751.1\/7T spring fit?\u003c\/strong\u003e It is the official spare for the 1751\/2T nipple insertion tool. Unior's 1751\/2T page states \"the spring is interchangeable, item 1751.1\/7T\" and links this 5-piece set in its spare-parts list. It is not a part for the 1751\/2 slotted driver or the 1751\/2Q square driver; those are one-piece drivers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many springs are in the pack?\u003c\/strong\u003e Five. Unior's official name for article 1751.1\/7T is \"Spring for nipple installation tool, 5 pcs set\", code 623300. The tool takes one spring at a time; the rest are spares for the drawer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know the spring needs replacing?\u003c\/strong\u003e The grip fades gradually. When the 1751\/2T starts dropping nipples more often than it used to, the spring is worn. Pop the old spring out of the tool body, push the new one in, and test the grip on a sample nipple before the next build.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the spring do in the insertion tool?\u003c\/strong\u003e The 1751\/2T's firm spring grips a spoke nipple so you can feed it through a double-wall rim's outer hole and screw it onto the spoke without losing it between the rim walls. It releases once the spoke threads in. The spring does the holding, which is why it is the tool's wear part.\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":34378798727212,"sku":"623300","price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/1751.1_7t.jpg?v=1642730054"},{"product_id":"replacement-clamp-jaw-covers-1693-11","title":"Replacement Clamp Jaw Covers 70mm","description":"\u003cp\u003eReplaceable rubber jaw covers are the wear part on every Unior stand clamp; the rubber takes the daily grip-and-release work, picks up grit and frame cleaner residue, and eventually wears thin or tears at a corner. The 70 mm Replacement Clamp Jaw Covers (Unior 1693.11) are the cover size sized for the \u003cstrong\u003ePro Shop Clamp 1693.1Q\u003c\/strong\u003e and the older 1693.1 \/ 1693.1S cam-style clamps with the 70 mm jaw height.\u003c\/p\u003e\n\u003cp\u003eWhen the rubber wears, you replace the rubber; the clamp itself stays. The covers slip onto the existing jaws without tools and lock into the same retention geometry the original factory covers used. The clamp goes from “showing its age” to “freshly bedded” in the time it takes to swap them in.\u003c\/p\u003e\n\u003ch2\u003eWhy fresh covers matter\u003c\/h2\u003e\n\u003cp\u003eA worn jaw cover doesn't grip the frame tube the way a fresh one does. The rubber compound is the surface that holds the bike under torque; once the rubber is glazed, hardened by frame cleaner, or torn through to the metal beneath, the clamp's hold on the bike is compromised. For carbon frames, an over-tightened clamp on worn covers is the failure mode that ends with a cored seat tube; for aluminum frames, it's the route to a clamp-shaped dent. Fresh covers protect both the bike and the clamp.\u003c\/p\u003e\n\u003ch2\u003eSizing: confirm before you order\u003c\/h2\u003e\n\u003cp\u003eThis is the \u003cstrong\u003e70 mm cover\u003c\/strong\u003e sized for clamps with the 70 mm jaw height. Two other cover sizes are available for different Unior clamp variants:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e96 mm covers\u003c\/strong\u003e fit the older square-style jaws on 1693.1 \/ 1693.1S clamps with the 90 mm jaw height.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e57.2 mm covers\u003c\/strong\u003e fit the Master Shop Clamp (1693.1M) with the shorter round-jaw geometry.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eMeasure your existing covers (or the bare jaw, if your stand is running with a shop rag in place of covers) before ordering; the three sizes are not cross-compatible.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eArticle number: 1693.11 (70 mm variant)\u003c\/li\u003e\n\u003cli\u003eMaterial: rubber\u003c\/li\u003e\n\u003cli\u003eCompatibility: Unior Pro Shop Clamp 1693.1Q (70 mm jaw); older 1693.1 \/ 1693.1S clamps with 70 mm jaws\u003c\/li\u003e\n\u003cli\u003eSold as: a pair (one set covers one clamp head)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e pair of 70 mm replacement rubber jaw covers.\u003c\/p\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 1693.11 covers are the consumable on a Pro Shop Clamp's daily life: every bike that goes on the clamp leaves a small mark on the rubber, and every shop rag wipe of the rubber accelerates the wear. Fresh covers from the same factory the clamp shipped from, sized to the 70 mm jaw the clamp was designed around.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eWe've watched shops use a shop rag as a jaw cover for years past the point a fresh set of covers would have paid back. The rag-on-jaw fix tells the customer everything they need to know about the rest of the shop's tool standards; fresh covers cost less than a single drink-of-bottled-water tab on a takeout order. Buy them when the originals look tired, not when they fail. Shopping for the clamp head itself rather than the covers? The cam-versus-QR decision lives in the buying guide: \u003ca href=\"\/blogs\/tech-tips\/how-to-choose-a-bike-repair-stand\"\u003eHow to choose a bike repair stand →\u003c\/a\u003e\u003c\/p\u003e","brand":"Unior","offers":[{"title":"70mm","offer_id":34378822647852,"sku":"627266","price":10.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/1693.11.jpg?v=1642728454"},{"product_id":"aluminum-threaded-head-for-pedal-genie","title":"Aluminum Threaded Head for 2650BI Pedal Genie - 2650.1\/1","description":"\u003ch2\u003eThe threaded-adapter wear part for your Pedal Genie\u003c\/h2\u003e\n\u003cp\u003eThe Pedal Genie 2650BI is the Unior install-aid tool that mounts onto a crank arm in place of a pedal, letting a mechanic spin the cranks while adjusting derailleurs on a new build or working on a bike that does not yet have pedals fitted. The 2650.1\/1 is the threaded aluminum adapter that screws into the crank's pedal bore on one end of the Genie; it is the working-contact part of the tool and the one that wears.\u003c\/p\u003e\n\u003ch2\u003eHow the Pedal Genie uses this head\u003c\/h2\u003e\n\u003cp\u003eThe Pedal Genie ships with two interchangeable adapters that mount on the same body. The aluminum 2650.1\/1 is the threaded one, sized to the standard 9\/16 inch by 20 TPI pedal-thread spec; it screws securely into the crank bore the same way a pedal would. The second adapter is a plastic conical friction-fit; it presses into the bore without engaging the threads, which is faster but less secure under the load of crank rotation.\u003c\/p\u003e\n\u003cp\u003eMechanics reach for the threaded adapter on longer jobs: drive-side mounting for a new-build assembly, repeated derailleur-trim cycles, anything where the Genie needs to stay seated through full revolutions. The conical adapter is for quick alignment checks. Replacing the threaded head when it wears keeps the secure-mount workflow in service across the life of the parent tool.\u003c\/p\u003e\n\u003ch2\u003eWhen to replace\u003c\/h2\u003e\n\u003cp\u003eThree signs the 2650.1\/1 is at the end of its useful window:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlack or wobble\u003c\/strong\u003e when the adapter is threaded into a known-good crank-arm bore. A fresh head seats firmly with no play; a worn one rocks in the bore under the load of crank rotation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisible aluminum wear\u003c\/strong\u003e on the engagement profile. The head wears from friction and thermal cycling in the crank bore over thousands of mount-and-spin cycles, not from a cutting action.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStripped or lost.\u003c\/strong\u003e A pedal-thread overload or a Genie that has gone missing from a service van means the head needs a replacement before the next new-build job.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eFits the \u003cstrong\u003eUnior Pedal Genie 2650BI\u003c\/strong\u003e parent tool only. Threaded to \u003cstrong\u003e9\/16 inch x 20 TPI\u003c\/strong\u003e, the universal pedal thread the Genie engages on the crank arm of any modern bike.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread spec:\u003c\/strong\u003e 9\/16 inch x 20 TPI (pedal-standard)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Replacement threaded adapter for Unior Pedal Genie 2650BI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 2650.1\/1\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 2650.1\/1 is sold as a separate spare because the Pedal Genie body is built to outlast many head-changes; only the working-contact adapter sees the cycle of friction and thermal load that calls for periodic replacement. Selling the wear part on its own is the difference between an install-aid that gets re-bought and one that stays in the toolbox through several head replacements.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eThe Pedal Genie earns its keep on new-build assembly day: cranks installed, chain on, derailleurs to be set, but no pedals fitted yet. Thread the 2650.1\/1 into the crank, spin the cranks under load, and run the derailleur-trim cycles without waiting on the pedal install. Our pedal-install guide covers the pedal-fitting procedure that follows the build sequence, including the thread-prep step we run before every pedal install: \u003ca href=\"\/blogs\/tech-tips\/how-to-install-and-remove-bike-pedals\"\u003eHow to install and remove bike pedals →\u003c\/a\u003e\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":39647473106988,"sku":"627824","price":13.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/2650.1_1_627824.jpg?v=1635345016"},{"product_id":"bearing-press-handle-and-shaft-1721-4","title":"Bearing Press Handle and Shaft - 1721.4","description":"\u003cp\u003eThe handle and shaft are the rebuildable spine of the Unior Bearing Press 1721 family. Everything else in the press kit (drifts, protection plates, quick-release handles) lives on the bench in a tray or in a parts drawer; the handle and shaft is the part that takes every load stroke and the part that, over enough years of bench use, eventually needs replacing. The 1721.4 brings a press back to factory-spec working life without forcing a new press purchase.\u003c\/p\u003e\n\u003ch2\u003eWhat this is for\u003c\/h2\u003e\n\u003cp\u003eThe 1721.4 is the threaded shaft and load-bearing handle that drives the press's mechanical advantage. The shaft threads through the press body, the drift sits on the working end, and the handle turns the shaft to drive the drift into the bearing. Three failure modes send a mechanic looking for the 1721.4:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe shaft's threads are damaged.\u003c\/strong\u003e Cross-threading at the start of a press stroke (usually on a bearing that wasn't seated square in the bore before pressing started) deforms the shaft thread and the press starts binding mid-stroke.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe handle bar has bent.\u003c\/strong\u003e Long handles on heavy presses see substantial cantilever load; a handle that's been used to break a stuck BB cup before transitioning back to bearing-press work occasionally takes a permanent set.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe press is being rebuilt.\u003c\/strong\u003e A press body that's still sound but has worn drift sockets, sticky threads, or a tired QR mechanism can be brought back to factory feel by replacing the wearable parts. The handle and shaft is the largest of those.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eMaterial and construction\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft:\u003c\/strong\u003e premium flex plus carbon steel; hardened and tempered for fatigue resistance under repeated thread engagement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHandle:\u003c\/strong\u003e chrome-plated steel bar with bonded grip; sized for hand torque without slipping under load\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread spec:\u003c\/strong\u003e matches the 1721 press body original spec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThe 1721.4 fits all current 1721-family press bodies. The thread spec has not changed across the press's production history, so a replacement handle and shaft retrofits a press that's been on the bench for years. The \u003ca href=\"\/products\/bearing-press-quick-release-handle-1721-3\"\u003eQuick-release Handle 1721.3\u003c\/a\u003e lives on the opposite end and is the faster-engagement alternative for shops that change bearings daily.\u003c\/p\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 handle and shaft is the part of the 1721 press we don't usually expect to wear out, which is what makes it worth replacing when it does. A press body that's still in spec earns another decade of service when the part that does the work gets renewed.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eA bearing press that starts feeling sticky mid-stroke usually has crud in the shaft threads, not a worn shaft itself. Wipe the threads down with a clean rag and a drop of light oil before you assume the shaft needs replacement. If the stick persists after a thread clean, then the shaft is genuinely tired and the 1721.4 is the right call. For where this fits in the bigger press workflow, see \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","offer_id":39670905143340,"sku":"627264","price":21.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/1721.4_627264.png?v=1642720309"},{"product_id":"set-of-spare-parts-for-1693-1q-1693-1q-sp-1","title":"Rebuild Kit for 1693.1Q Pro Shop Clamp - 1693.1Q-SP.1","description":"\u003cp\u003eThe Pro Shop Clamp 1693.1Q lives the same daily life as a shop's most-used tool: thousands of bike-to-bike cycles, hundreds of lever-actuated open-and-closes, and the slow accumulation of grit and dried-frame-cleaner residue in the ratchet mechanism. The Rebuild Kit for the 1693.1Q is the service item that resets the clamp's ratchet to like-new without replacing the entire clamp head.\u003c\/p\u003e\n\u003cp\u003eIf the QR ratchet has started to slip, ghost-grip, or feel notchy as it engages, the spares kit is usually the right answer before the next step (replacing the clamp head outright). The kit ships with the wear-prone internals of the ratchet mechanism: the parts that take the cyclic load every time a mechanic works the QR.\u003c\/p\u003e\n\u003ch2\u003eWhen to use it\u003c\/h2\u003e\n\u003cp\u003eTwo signs the clamp is asking for the rebuild kit rather than a full replacement:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe QR release feels notchy or grabbing rather than smooth.\u003c\/strong\u003e The ratchet pawl spring or pawl face is worn; the rebuild kit's spring and pawl restore the smooth release.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe clamp doesn't hold pressure between bikes.\u003c\/strong\u003e The pressure-set mechanism has drifted; the rebuild kit's internals reset the mechanism to its factory tolerance.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eIf the clamp jaws themselves are cracked, the body is bent, or the QR button stem is stripped, the issue is past the rebuild kit's scope; replace the clamp head with a new 1693.1Q.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eFits the Unior Pro Shop Clamp 1693.1Q on Single Arm Pro Stands, Double Arm Pro Stands, and BikeGator+ Pro Shop QR portable stands. The rebuild kit is specific to the 1693.1Q quick-release mechanism; cam-style clamps (1693.1S, 1693.1) use a different mechanism and aren't covered.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eArticle number: 1693.1Q-SP.1\u003c\/li\u003e\n\u003cli\u003eCompatibility: Unior Pro Shop Clamp 1693.1Q (all stands)\u003c\/li\u003e\n\u003cli\u003eScope: ratchet mechanism internal wear parts\u003c\/li\u003e\n\u003cli\u003eService interval: as needed, when the QR mechanism shows wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e rebuild-kit parts set for the 1693.1Q QR mechanism.\u003c\/p\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 1693.1Q rebuild kit reflects the same long-service-life design assumption that runs through the rest of Unior's catalog: parts wear, the wear-prone parts are user-serviceable, and the rebuild kit costs a fraction of the clamp head replacement. The clamp is designed to outlive a workshop's first decade; the rebuild kit is what makes that outcome the typical one rather than the exception.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eA QR clamp that's slipping under a heavy bike is the clamp asking for service, not the clamp asking to be retired. The rebuild kit is a fifteen-minute swap that restores the original feel. Shops running the 1693.1Q in daily service usually go through one rebuild kit every five to seven years of heavy use; lighter use, more like a decade. If you're shopping the QR clamp for a new stand rather than rebuilding an existing one, the buying guide compares the Pro Shop QR against the cam-style alternative directly: \u003ca href=\"\/blogs\/tech-tips\/how-to-choose-a-bike-repair-stand\"\u003eHow to choose a bike repair stand →\u003c\/a\u003e\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default","offer_id":40173035618348,"sku":"628969","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/1693.1q-sp.1.png?v=1648670476"},{"product_id":"replacement-tip-for-truing-stand-caliper-arm-1689-5","title":"Spare tip for Truing Stand Caliper - 1689.5","description":"\u003cp\u003eLost the tips on your arms? Don't want them scratching up those carbon rims? We've got you covered.\u003c\/p\u003e\n\u003cp\u003eSold as single tips. Not pairs.\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":40514639233068,"sku":"623256","price":2.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/1689.5_623256_image_1024.jpg?v=1658263377"},{"product_id":"axle-adaptor-1689-3","title":"Axle Adaptor - 1689.3","description":"\u003cp\u003eA thru-axle hub will not rest in a Unior truing stand the way a quick-release or solid axle does. Axle Adaptor 1689.3 is the official magnetic pair that locates 12, 15 and 20 mm thru-axles on the stand uprights.\u003c\/p\u003e\n\u003cp\u003eEach adaptor is a short cone with a magnet on the back. Drop one into the top of each upright, snug the bolt so it cannot walk, then set the wheel so the axle ends sit in the cones. Take the wheel off and the magnets hold the pair anywhere on the stand until the next job.\u003c\/p\u003e\n\u003cp\u003eThe current Pro Truing Stand 1689 already ships with this pair. Buy this listing as a spare: a lost cone, a second bench, or a Portable Truing Stand 1688, whose official instruction manual names 1689.3 as the extra for 12, 15 or 20 mm axles. The 1688 product page and datasheet do not repeat that list; the manual is the source.\u003c\/p\u003e\n\u003cp\u003eThis is not the Cannondale Lefty adaptor. Lefty front hubs are asymmetric and need article 1689.6. 1689.3 is the standard thru-axle pair.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e12, 15 and 20 mm thru-axle standards. One pair covers all three.\u003c\/li\u003e\n\u003cli\u003ePro Truing Stand 1689. Unior lists 1689.3 as an accessory; the current stand includes the pair.\u003c\/li\u003e\n\u003cli\u003ePortable Truing Stand 1688. The official 1688 instruction manual names 1689.3 as a spare for 12, 15 or 20 mm axles.\u003c\/li\u003e\n\u003cli\u003eNot for Cannondale Lefty hubs. Those use adaptor 1689.6.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eArticle 1689.3, code 629321\u003c\/li\u003e\n\u003cli\u003eTwo pieces in the set\u003c\/li\u003e\n\u003cli\u003eDiameter (D) 22 mm\u003c\/li\u003e\n\u003cli\u003eLength (L) 20 mm\u003c\/li\u003e\n\u003cli\u003eWeight 57 g\u003c\/li\u003e\n\u003cli\u003eMagnetic so they park on the stand when not in use\u003c\/li\u003e\n\u003cli\u003eBolts hold them on the uprights in use\u003c\/li\u003e\n\u003cli\u003eOfficial page carries Unior's lifetime-warranty and trivalent-chrome profile badges\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAll listed dimensions are in millimetres and may vary in tolerance. Weight is in grams.\u003c\/p\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 1689.3 pair is the small part that lets a modern thru-axle wheel use the same stand as a quick-release wheel.\u003c\/p\u003e\n\u003ch2\u003ePro Tip\u003c\/h2\u003e\n\u003cp\u003eSeat the axle fully in both cones and keep the bolts snug before you read the rim. A cone that can tilt is a wheel that reads false. The stand procedure 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 axle sizes does the 1689.3 fit?\u003c\/strong\u003e Unior publishes three: 12, 15 and 20 mm thru-axle standards. The official table is a two-piece set, so one pair covers all three sizes. It is not a per-diameter kit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich truing stands does it fit?\u003c\/strong\u003e Unior lists 1689.3 as an accessory of the Pro Truing Stand 1689. The official 1688 instruction manual names 1689.3 as the spare for 12, 15 or 20 mm axles. The 1688 product page and datasheet do not repeat that list.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the Pro Truing Stand 1689 already include these?\u003c\/strong\u003e The current 1689 (code 629297) ships with the conical magnetic pair. This listing is the spare pair, code 629321, for a lost cone, a second bench, or a 1688 that never included adapters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the official dimensions, and is this the Lefty adaptor?\u003c\/strong\u003e Diameter 22 mm, length 20 mm, weight 57 g, two pieces. Cannondale Lefty front hubs need article 1689.6, not 1689.3. Unior says Lefty wheels cannot sit on the stand with the usual adaptors.\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":41189165531180,"sku":"629321","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/files\/Axle-Adaptor---1689.3.jpg?v=1732186957"},{"product_id":"1693-25-stand-body-for-1693-2","title":"Stand body for 623251","description":"\u003cp\u003eThe Stand Body 1693.25 is the bare structural arm of the wall- or bench-mounted 1693.2 repair stand line: the steel post, the column geometry, and the mount surfaces that take the clamp head, sold as a standalone replacement part. Two cases bring shops to the bare body: a stand that's been damaged at the mount (a heavy impact, a service-truck-induced bend) and a shop swapping clamp heads on a long-lived wall-mount install without replacing the whole stand.\u003c\/p\u003e\n\u003cp\u003eFor shops running the 1693.2 cam-style or the 1693.2S quick-release wall-mount line in daily service, the stand body is the long-lived part of the install; the clamp head sees the bike-to-bike wear and is the typical service-replacement item, but the stand body itself can be the load-bearing replacement if the mount has been impacted or worked past its working tolerance.\u003c\/p\u003e\n\u003ch2\u003eWhat it replaces\u003c\/h2\u003e\n\u003cp\u003eThe 1693.25 replaces the structural arm only; it does not include the clamp head, the mount hardware to the wall or bench, or the rubber jaw covers. The intended use is as a replacement body to receive an existing or new clamp head (1693.1 cam-style, 1693.1S manually adjustable, or 1693.1Q Pro Shop QR) on a wall or bench install where the previous body has been retired.\u003c\/p\u003e\n\u003cp\u003eFor shops fitting a new clamp head to a working stand body, the clamp heads are sold separately and listed on their own product pages.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eFits the Unior 1693.2 family of wall- or bench-mounted repair stand installs. The clamp-head mount geometry is shared across the 1693.2 (cam-style) and 1693.2S (QR) configurations; the stand body is compatible with either clamp head choice. Mount hardware to the wall stud or benchtop is install-side and not included with the body itself.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eArticle number: 1693.25 (replacement stand body for 1693.2 series)\u003c\/li\u003e\n\u003cli\u003eConstruction: steel, finished for workshop service life\u003c\/li\u003e\n\u003cli\u003eCompatibility: Unior 1693.2 wall- or bench-mount stand family\u003c\/li\u003e\n\u003cli\u003eReplaces: stand body only; clamp head and mount hardware sold separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e stand body arm with clamp-head mount interface.\u003c\/p\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. A wall-mount install in a working shop sees occasional impacts; the 1693.25 is the catalog answer for the morning after one. Steel post, finished to the same workshop spec as the rest of the 1693.2 family, sized to take a clamp head and the loads a wall-mount sees from below.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eMost shops never order the 1693.25; the stand body outlives the rest of the install. The two situations where it's the right buy are damage repair (a forklift, a falling shelf, a service-truck door catching the stand on the way out) and a clamp-head upgrade where the existing body is fine but the clamp head needs swapping. For most other cases, the clamp head is the part to swap; the body stays. If you're not sure whether the stand body or the clamp head is the right replacement, the buying guide walks through the cam-versus-QR decision the body is built to carry either way: \u003ca href=\"\/blogs\/tech-tips\/how-to-choose-a-bike-repair-stand\"\u003eHow to choose a bike repair stand →\u003c\/a\u003e\u003c\/p\u003e","brand":"Unior USA","offers":[{"title":"Default Title","offer_id":43445522694188,"sku":"623251","price":147.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/files\/1693.25_623251_image_1024.jpg?v=1737544314"},{"product_id":"adjustable-screw-for-clamp-1693-1-and-1693-1s-1693-21","title":"Adjustable screw for clamp 1693.1 and 1693.1S","description":"\u003cp\u003eThe Adjustable Screw 1693.21 is the threaded handle and screw shaft that dials in the jaw pressure on Unior's cam-style clamp heads: the 1693.1 and 1693.1S, in the older square-style jaw geometry with the 90 mm or 70 mm jaw height. Two cases bring shops to this part: a screw that's threaded out of tolerance after years of bike-to-bike pressure setting, and a clamp where the handle has been overtorqued and the screw has bent.\u003c\/p\u003e\n\u003cp\u003eThe cam-style clamp's pressure adjustment is a wear part by design. The lever closes the jaws against the pressure dialed in by the adjustable screw; over thousands of clamping cycles, the screw threads see the load and the wear shows up as a screw that doesn't seat at the same pressure for a given handle position. The 1693.21 replacement screw restores the clamp's pressure-setting precision without requiring a full clamp head replacement.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThe 1693.21 fits the \u003cstrong\u003eolder square-style jaw clamp geometry\u003c\/strong\u003e on these clamp heads:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePro Repair Clamp 1693.1S\u003c\/strong\u003e (manually adjustable cam-style)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEarlier 1693.1 cam-style clamps\u003c\/strong\u003e with 70 mm or 90 mm jaw height\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf your clamp is the round-jaw Master Shop Clamp (1693.1M) or the quick-release Pro Shop Clamp (1693.1Q), this screw is not the right part. The Master Shop and Pro Shop use different pressure-setting mechanisms; the 1693.1Q has its own rebuild kit (1693.1Q-SP.1), and the 1693.1M's clamp pressure is dialed via a different threaded interface. One more check before ordering: from mid-2022 the 1693.1 and 1693.1S themselves moved to round-profile jaws (50 mm tall), and that generation takes the newer \u003ca href=\"\/products\/adjustable-screw-for-new-2022-clamp-1693-1-and-1693-1s-round-clamp-profile\"\u003e1693.23 adjustable screw\u003c\/a\u003e, not this one.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eArticle number: 1693.21\u003c\/li\u003e\n\u003cli\u003eCompatibility: Unior cam-style clamp heads 1693.1 and 1693.1S with old square-style jaws (70 mm or 90 mm jaw height)\u003c\/li\u003e\n\u003cli\u003eFunction: adjustable pressure-setting screw for cam-style clamp mechanism\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e replacement adjustable screw with handle.\u003c\/p\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 1693.21 is a small part for a precise problem: the cam-clamp's pressure setting drifts over years of thumb-and-handle use, and the screw is the part that carries that drift. Replace the screw, the pressure precision comes back; the rest of the clamp stays in service.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eBefore you order the 1693.21, confirm your clamp's jaw geometry. The older square jaws are flat-faced and 70 mm or 90 mm tall; the newer round jaws (Master Shop, Pro Shop, and the mid-2022-onward 1693.1 and 1693.1S) are visibly cylindrical and shorter (50 mm to 70 mm). If your clamp has round jaws, the 1693.21 is the wrong part. For shops running multiple stand vintages, this is one of the small SKU-fitment calls that's worth getting right the first time. Replacing the screw on a working stand is one thing; upgrading the whole clamp head is another. The buying guide covers when each path makes sense: \u003ca href=\"\/blogs\/tech-tips\/how-to-choose-a-bike-repair-stand\"\u003eHow to choose a bike repair stand →\u003c\/a\u003e\u003c\/p\u003e","brand":"Unior USA","offers":[{"title":"Default Title","offer_id":43526782320684,"sku":"629251","price":27.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/files\/1693.21_629251_image_1024.jpg?v=1737544950"},{"product_id":"replacement-clamp-jaw-covers-96mm","title":"Replacement Clamp Jaw Covers 96mm","description":"\u003cp\u003eReplaceable rubber jaw covers are the wear part on every Unior stand clamp; the rubber takes the daily grip-and-release work, picks up grit and frame cleaner residue, and eventually wears thin or tears at a corner. The 96 mm Replacement Clamp Jaw Covers (Unior 1693.11) are the cover size sized for the older \u003cstrong\u003esquare-style jaw geometry on cam-style 1693.1 \/ 1693.1S clamps with the 90 mm jaw height\u003c\/strong\u003e; the wider taller jaws found on long-serving cam clamps from the 1693 family's earlier production runs.\u003c\/p\u003e\n\u003cp\u003eWhen the rubber wears, you replace the rubber; the clamp itself stays. The covers slip onto the existing jaws without tools and lock into the same retention geometry the original factory covers used. The clamp goes from “showing its age” to “freshly bedded” in the time it takes to swap them in.\u003c\/p\u003e\n\u003ch2\u003eWhy fresh covers matter\u003c\/h2\u003e\n\u003cp\u003eA worn jaw cover doesn't grip the frame tube the way a fresh one does. The rubber compound is the surface that holds the bike under torque; once the rubber is glazed, hardened by frame cleaner, or torn through to the metal beneath, the clamp's hold on the bike is compromised. For carbon frames, an over-tightened clamp on worn covers is the failure mode that ends with a cored seat tube; for aluminum frames, it's the route to a clamp-shaped dent. Fresh covers protect both the bike and the clamp.\u003c\/p\u003e\n\u003ch2\u003eSizing: confirm before you order\u003c\/h2\u003e\n\u003cp\u003eThis is the \u003cstrong\u003e96 mm cover\u003c\/strong\u003e for the older square-style cam-clamp jaw geometry. Two other cover sizes are available for different Unior clamp variants:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e70 mm covers\u003c\/strong\u003e fit the Pro Shop Clamp (1693.1Q) and the 70 mm-jaw variants of the 1693.1 \/ 1693.1S cam-style clamps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e57.2 mm covers\u003c\/strong\u003e fit the Master Shop Clamp (1693.1M) with the shorter round-jaw geometry.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eMeasure your existing covers (or the bare jaw, if your stand is running with a shop rag in place of covers) before ordering; the three sizes are not cross-compatible. The 96 mm cover is the right buy if your clamp has flat-faced square jaws that measure 90 mm tall.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eArticle number: 1693.11 (96 mm variant)\u003c\/li\u003e\n\u003cli\u003eMaterial: rubber\u003c\/li\u003e\n\u003cli\u003eCompatibility: Unior cam-style 1693.1 \/ 1693.1S clamps with old square-style 90 mm jaws\u003c\/li\u003e\n\u003cli\u003eSold as: a pair (one set covers one clamp head)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e pair of 96 mm replacement rubber jaw covers.\u003c\/p\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 continued availability of the 96 mm cover for older cam-clamp jaws reflects Unior's long-service-life design assumption; cam-style clamps on shop walls from a decade ago still get rubber-cover service from the same SKU family. A stand bought in 2014 still gets its consumable parts in 2026.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eIf you're not sure whether your clamp uses the 96 mm cover or the 70 mm cover, the visual test is the jaw face: square-jaw clamps with a flat-faced rectangular profile and 90 mm jaw height use the 96 mm cover. Round-jaw or shorter-jaw clamps use a different cover. For shops running multiple clamp generations on the bench, keeping a small inventory of all three covers (70 mm, 96 mm, 57.2 mm) is the practical way to never get caught mid-job with a torn cover and the wrong size in stock. If you're choosing a new clamp head rather than recovering an old one, the buying guide compares the cam-style 1693.1S, the QR 1693.1Q, and the Master Shop 1693.1M directly: \u003ca href=\"\/blogs\/tech-tips\/how-to-choose-a-bike-repair-stand\"\u003eHow to choose a bike repair stand →\u003c\/a\u003e\u003c\/p\u003e","brand":"Unior","offers":[{"title":"Default Title","offer_id":44140742082604,"sku":"621961","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/1693.11.jpg?v=1642728454"},{"product_id":"replacement-clamp-jaw-covers-57-2mm-for-master-shop-clamp","title":"Replacement Clamp Jaw Covers 57.2mm for Master Shop Clamp","description":"\u003cp\u003eReplaceable rubber jaw covers are the wear part on every Unior stand clamp; the rubber takes the daily grip-and-release work, picks up grit and frame cleaner residue, and eventually wears thin or tears at a corner. The 57.2 mm Replacement Clamp Jaw Covers are the cover size sized for the \u003cstrong\u003eMaster Shop Clamp 1693.1M\u003c\/strong\u003e with the shorter round-jaw geometry; the e-bike-era clamp head Unior redesigned in 2021 around heavy-bike workshop reality.\u003c\/p\u003e\n\u003cp\u003eWhen the rubber wears, you replace the rubber; the clamp itself stays. The covers slip onto the existing round jaws without tools and lock into the retention geometry the Master Shop Clamp uses.\u003c\/p\u003e\n\u003ch2\u003eWhy this size fits the Master Shop Clamp\u003c\/h2\u003e\n\u003cp\u003eBikerumor's 2021 coverage of the Master Shop Clamp launch framed the design move directly: \u003cem\u003e“Unior has updated their premium repair clamp with a more rugged, more rigid design to work with modern bikes and heavy e-bikes. The narrow 5 cm round jaws with replaceable rubber covers should fit just about any bike, while clamping it securely.”\u003c\/em\u003e The 57.2 mm cover sits on those 5 cm round jaws; the older square-jaw clamps in the 1693.1 \/ 1693.1S family use the 96 mm cover, and the Pro Shop QR (1693.1Q) uses the 70 mm cover.\u003c\/p\u003e\n\u003ch2\u003eWhy fresh covers matter\u003c\/h2\u003e\n\u003cp\u003eA worn jaw cover doesn't grip the frame tube the way a fresh one does. On heavy e-bikes (the use case the Master Shop Clamp was redesigned for), this matters more: clamping pressure is higher, and a glazed or torn cover fails earlier under that load. For carbon frames, the failure mode is a cored seat tube; for aluminum, a clamp-shaped dent.\u003c\/p\u003e\n\u003ch2\u003eSizing: confirm before you order\u003c\/h2\u003e\n\u003cp\u003eThis is the \u003cstrong\u003e57.2 mm cover\u003c\/strong\u003e for the Master Shop Clamp 1693.1M. Two other cover sizes exist for different Unior clamp variants:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e70 mm covers\u003c\/strong\u003e fit the Pro Shop Clamp (1693.1Q) and the 70 mm-jaw variants of the 1693.1 \/ 1693.1S cam-style clamps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e96 mm covers\u003c\/strong\u003e fit the older square-style cam-clamp jaws on the 1693.1 \/ 1693.1S with the 90 mm jaw height.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 57.2 mm cover is the right buy if your clamp is the Master Shop Clamp (round jaws, ~5 cm tall, fitted to the 1693EL Electric Repair Stand and sold standalone as the 1693.1M).\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eArticle number: 1693.11 (57.2 mm variant for Master Shop Clamp)\u003c\/li\u003e\n\u003cli\u003eMaterial: rubber\u003c\/li\u003e\n\u003cli\u003eCompatibility: Unior Master Shop Clamp 1693.1M (also fitted to 1693EL Electric Repair Stand)\u003c\/li\u003e\n\u003cli\u003eSold as: a pair (one set covers one clamp head)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e pair of 57.2 mm replacement rubber jaw covers.\u003c\/p\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 Master Shop Clamp's round jaws and replaceable covers were part of the 2021 redesign that took the clamp from “shop floor general purpose” to “e-bike-era workshop standard”; the 57.2 mm cover is the sizing match for that design.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eThe Master Shop Clamp's covers see more load per clamping cycle than the older square-jaw covers because e-bikes are heavier and demand more pressure to hold. The service interval is faster on a Master Shop-equipped stand running heavy bikes than on a 1693.1S running road bikes; shops typically replace these every twelve to eighteen months in heavy e-bike service, versus every three to five years for a road-bike-only cam clamp. Shopping for the clamp head itself or the stand that carries it? The buying guide makes the e-bike-stand decision concrete: \u003ca href=\"\/blogs\/tech-tips\/how-to-choose-a-bike-repair-stand\"\u003eHow to choose a bike repair stand →\u003c\/a\u003e\u003c\/p\u003e","brand":"Unior","offers":[{"title":"57.2mm for Master Shop Clamp","offer_id":44140742443052,"sku":"626337","price":13.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/products\/1693.11.jpg?v=1642728454"},{"product_id":"plastic-ring-for-1625-2bb90-1625-2-2bb90","title":"Plastic ring for 1625\/2BB90 - 1625.2\/2BB90","description":"\u003cp\u003ePress-fit bottom bracket tools work by staying square. The moment the tool can tilt inside the shell, it stops pushing the bearing straight out and starts pushing it into the frame. The plastic ring on the Unior 1625\/2BB90 is the part that prevents that, and because it is the softest component in the assembly, it is also the part that wears first.\u003c\/p\u003e\n\u003ch2\u003eWhat this is\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003e1625.2\/2BB90\u003c\/strong\u003e is the genuine replacement plastic ring for the \u003ca href=\"\/products\/tool-for-removing-bottom-bracket-bb90\"\u003eUnior 1625\/2BB90 BB90 removal tool\u003c\/a\u003e. It is a service part, sold on its own so a worn ring does not mean replacing the whole tool.\u003c\/p\u003e\n\u003ch2\u003eWhen to replace it\u003c\/h2\u003e\n\u003cp\u003eReplace the ring when it is visibly scored, deformed, or no longer holds the tool centred in the shell. A worn ring shows up as a tool that feels like it wants to cock over as pressure comes on; the ring is doing its job right up until it isn't, and the failure mode is the tool going crooked rather than the ring falling apart.\u003c\/p\u003e\n\u003cp\u003eIn a high-volume shop that services a lot of Trek frames, this is a consumable. In a home workshop it may well outlast the bikes.\u003c\/p\u003e\n\u003ch2\u003eWhy the ring is plastic\u003c\/h2\u003e\n\u003cp\u003eBecause the alternative is metal, and metal against a bearing bore leaves marks in the frame. The ring is deliberately the sacrificial component in the assembly: it is softer than both the tool and the frame, so wear lands on the cheap replaceable part rather than on the shell of somebody's frame. That is a design decision, not a cost saving.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eFits the Unior 1625\/2BB90 BB90 removal tool. It is not a universal press-fit tool part; check your tool's part number before ordering.\u003c\/p\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. Stocking individual service parts for a tool this specific is the part of the catalog that does not pay for itself directly; it exists so a workshop tool stays a repairable object rather than a disposable one.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eCheck the ring before the job, not during it. A press-fit removal is one of the few procedures where discovering a worn tool halfway through leaves you with a partially extracted bearing and no good options. Ten seconds of inspection up front. Our press-fit guidance and broader workshop setup notes: \u003ca href=\"\/blogs\/tech-tips\/how-to-set-up-a-professional-bike-workshop\"\u003eHow to set up a professional bike workshop →\u003c\/a\u003e\u003c\/p\u003e","brand":"Unior USA","offers":[{"title":"Default Title","offer_id":44209426006060,"sku":"627229","price":3.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/files\/1625.2_2bb90_627229_image_1024.jpg?v=1783533904"},{"product_id":"clamping-bracket-with-handle-for-clamp-for-1693el","title":"Clamping bracket with handle for clamp for 1693EL","description":"\u003cp\u003eA repair stand is only as good as its clamp, and the clamp is the part of the stand that absorbs every bike that has ever been mounted in it. On the Unior 1693EL Electric Repair Stand, the clamping bracket with handle is the assembly that carries that load and sets the clamp's position. This is the genuine replacement part, sold on its own.\u003c\/p\u003e\n\u003ch2\u003eWhat this is\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003e1693EL.12\u003c\/strong\u003e clamping bracket with handle, for the clamp on the Unior 1693EL Electric Repair Stand. A slotted body with flanged mounting holes and an integral handle, supplied as a service part so a damaged or worn bracket does not put the whole stand out of service.\u003c\/p\u003e\n\u003ch2\u003eWhen you need one\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThe bracket is bent, cracked or has been over-torqued.\u003c\/li\u003e\n\u003cli\u003eThe handle no longer holds its setting under load.\u003c\/li\u003e\n\u003cli\u003eThe stand came to you second-hand with parts missing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA repair stand that has been in a busy shop for a few seasons has usually had at least one bike dropped into it harder than the clamp was expecting. This is the part that takes it.\u003c\/p\u003e\n\u003ch2\u003eWhy buy the genuine part\u003c\/h2\u003e\n\u003cp\u003eThe clamp assembly is a load path with a bike on the end of it, mounted at chest height, frequently over somebody's hands. A substitute bracket that is dimensionally close but not the same material specification is not a saving; it is the one component in the workshop where the failure mode is a frame hitting the floor. Order by part number.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eFits the clamp on the Unior 1693EL Electric Repair Stand. Confirm your stand model before ordering; this bracket is specific to the 1693EL and is not shared with the mechanical stand range.\u003c\/p\u003e\n\u003ch2\u003eOther 1693EL parts and accessories\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/1693el-11-height-extension-kit-for-1693el\"\u003eHeight Extension Kit for 1693EL (1693EL.11)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/fixed-tool-tray-for-1693el-1693el-7\"\u003eFrame mount tool tray for 1693EL (1693EL.7)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/folding-tool-tray-for-1693el-1693el-5\"\u003eFolding Tool Tray for 1693EL (1693EL.5)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/folding-small-parts-bin-holder-for-1693el-1693el-3\"\u003eFolding Small Parts Organizer for 1693EL (1693EL.3)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/remote-control-for-1693el-1693el-20\"\u003eRemote Control for 1693EL (1693EL.20)\u003c\/a\u003e\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. Keeping individual stand components on the parts list is what makes a capital purchase like an electric repair stand a ten-year asset rather than a five-year one.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eIf the clamp has taken a hit hard enough to need this bracket, inspect the clamp jaws and the mounting hardware at the same time. Impact damage rarely lands on one component in isolation, and the second failure always arrives at the least convenient moment. Our workshop guide covers stand selection and maintenance: \u003ca href=\"\/blogs\/tech-tips\/how-to-set-up-a-professional-bike-workshop\"\u003eHow to set up a professional bike workshop →\u003c\/a\u003e\u003c\/p\u003e","brand":"Unior USA","offers":[{"title":"Default Title","offer_id":44671302402092,"sku":"629166","price":77.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/files\/1693el.12_629166_image_1024.jpg?v=1761849226"},{"product_id":"1640-1-4-replaceable-pin-for-chain-rivet-pliers","title":"1640.1\/4 - Replaceable pin for chain rivet pliers","description":"\u003cp\u003e1640.1\/4 - Replaceable pin for chain rivet pliers\u003c\/p\u003e","brand":"Unior USA","offers":[{"title":"Default Title","offer_id":44862233149484,"sku":"605956","price":3.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/files\/1640.1_4_605956_image_1024.jpg?v=1783533904"},{"product_id":"adjustable-screw-for-new-2022-clamp-1693-1-and-1693-1s-round-clamp-profile","title":"Adjustable screw for NEW (2022) clamp 1693.1 and 1693.1S (round clamp profile)","description":"\u003cp\u003eThe 1693.23 is the adjustable screw for Unior's Pro repair clamps: the threaded spindle assembly that sets how far the jaws open and how hard they close on a frame tube. Unior lists it as the replacement adjuster for both current clamp heads, the auto-adjustable 1693.1 and the manually adjustable 1693.1S. On the manual clamp it is the screw you turn at every tube-diameter change, so when the threads stop holding a setting, or the spindle picks up a bend from an overtorqued handle, a new screw puts the clamp back to spec without replacing the whole head.\u003c\/p\u003e\n\u003cp\u003eThis is the newer of the two adjustable screws Unior makes for these clamps. From mid-2022 the 1693.1 and 1693.1S moved to round-style clamping jaws, 50 mm tall, and the adjustable screw changed with the jaws. Unior lists this version, code 629253, for the round-jaw clamps only.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThe 1693.23 fits the round-jaw generation of both Pro repair clamp heads:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/pro-repair-clamp-auto-adjustable\"\u003ePro Repair Clamp, Auto Adjustable 1693.1\u003c\/a\u003e, round-style jaws, mid-2022 onward\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/pro-repair-clamp-manually-adjustable\"\u003ePro Repair Clamp, Manually Adjustable 1693.1S\u003c\/a\u003e, round-style jaws, mid-2022 onward\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf your clamp has the older square-style jaws, 70 mm or 90 mm tall, it takes the \u003ca href=\"\/products\/adjustable-screw-for-clamp-1693-1-and-1693-1s-1693-21\"\u003e1693.21 adjustable screw\u003c\/a\u003e instead. And if the clamp on your stand is the Master Shop 1693.1M or the quick-release Pro Shop 1693.1Q, neither screw applies: those clamps use different pressure mechanisms, and the 1693.1Q has its own \u003ca href=\"\/products\/set-of-spare-parts-for-1693-1q-1693-1q-sp-1\"\u003erebuild kit\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eHow to tell which screw you need\u003c\/h2\u003e\n\u003cp\u003eLook at the jaws, not the stand. Round-profile jaws 50 mm tall mean a mid-2022-or-later clamp and this screw, the 1693.23. Flat-faced square-style jaws at 70 mm or 90 mm mean the earlier clamp and the 1693.21. The two generations of clamp look close to identical from across a workshop, and so do the two screws, so a quick ruler check against the jaw height settles it before you order.\u003c\/p\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eArticle number: 1693.23\u003c\/li\u003e\n\u003cli\u003eUnior code: 629253\u003c\/li\u003e\n\u003cli\u003eFits: 1693.1 and 1693.1S Pro repair clamps with round-style clamping jaws (50 mm, mid-2022 onward)\u003c\/li\u003e\n\u003cli\u003eNot for: square-style jaws (70 mm or 90 mm tall; use the 1693.21) or the 1693.1M and 1693.1Q clamps\u003c\/li\u003e\n\u003cli\u003eWeight: 150 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 1693.23 is that thinking applied to a wear point: the adjuster that carries the clamp's daily use is available on its own, so a hard-working clamp head stays in service instead of being replaced.\u003c\/p\u003e\n\u003ch2\u003ePro tip from our mechanics\u003c\/h2\u003e\n\u003cp\u003eCheck the jaw height before you order, even if you know when you bought the stand. Clamp heads get swapped between stands in busy workshops, and the mid-2022 changeover means two stands bought months apart can take different screws. Round jaws at 50 mm: this screw. Square jaws at 70 or 90 mm: the 1693.21. And if the clamp head itself is tired, weigh an upgrade instead of a repair: \u003ca href=\"\/blogs\/tech-tips\/how-to-choose-a-bike-repair-stand\"\u003eHow to choose a bike repair stand →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhich clamps does the 1693.23 adjustable screw fit?\u003c\/strong\u003e It fits Unior's Pro repair clamp heads 1693.1 (auto adjustable) and 1693.1S (manually adjustable) built from mid-2022 onward, the versions with round-style clamping jaws 50 mm tall. Unior lists it as the replacement adjuster for both models under code 629253.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know whether my clamp needs the 1693.23 or the 1693.21?\u003c\/strong\u003e Check the jaws. Round-profile jaws about 50 mm tall mean a mid-2022-or-later clamp, which takes this screw, the 1693.23. Flat-faced square-style jaws 70 mm or 90 mm tall mean the earlier generation, which takes the 1693.21 instead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the 1693.23 fit the Master Shop 1693.1M or Pro Shop 1693.1Q clamps?\u003c\/strong\u003e No. The 1693.1M and 1693.1Q use different pressure-setting mechanisms, so neither the 1693.23 nor the 1693.21 applies to them. The 1693.1Q has its own rebuild kit, sold separately as the 1693.1Q-SP.1.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the adjustable screw do on the clamp?\u003c\/strong\u003e It is the threaded spindle that sets the jaw opening and the closing pressure. On the manually adjustable 1693.1S you turn it to match the frame tube before closing the lever. A worn or bent screw is why a clamp stops holding its pressure setting, and replacing it restores the clamp without a new head.\u003c\/p\u003e","brand":"Unior USA","offers":[{"title":"Default Title","offer_id":45902538965036,"sku":"629253","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/5786\/5260\/files\/1693.23_629253_image_1024.jpg?v=1785873437"}],"url":"https:\/\/uniorusa.com\/collections\/spare-parts.oembed","provider":"Unior USA","version":"1.0","type":"link"}