Adjustable Pin Spanner Wrench

An adjustable pin spanner is the tool that lets one wrench cover what would otherwise need five. Cup-and-cone bottom-bracket adjustable cups, two-hole lockrings, and other pin-style adjusters share a common interface (two holes drilled or milled into the part) but they don't share spacing. A fixed pin spanner only fits one of them.

The Adjustable Pin Spanner 253/2DP-US has two interchangeable pins (2.3 mm and 2.8 mm to match the two pin diameters you'll actually encounter on bicycle work) and a sliding adjustment that takes the pin spacing from 10 mm to 50 mm. That covers the two-hole adjustable left cup on cup-and-cone bottom brackets (the job Unior's service manual assigns this tool) and other pin-style rings and adjusters inside that span.

The 185 mm handle is long enough for the leverage cup-and-cone cups actually need. A short handle slips off the pins as you put weight into the swing; the 253 keeps the pins seated against the part while you turn the cup.

What it isn't

It isn't a substitute for a proper Hollowtech II 16-notch wrench or a cassette lockring tool. Those are spline-engaged, not pin-engaged, and the engagement geometry doesn't transfer. The adjustable pin spanner is specifically for pin-style lockrings and adjusters, which is a smaller (but still ongoing) part of the workshop.

It also isn't an impact tool. Hand-torque only; the pins will deform under impact loading.

Specs

• Pin diameters: 2.3 mm and 2.8 mm (interchangeable)
• Pin spacing range: 10 mm to 50 mm
• Material: premium flex plus carbon steel, entirely hardened and tempered; pins black finish; surface trivalent chrome plated to ISO 1456:2009; double plastic dipped handles; 185 mm; 123 g
• Article number: 253/2DP-US. Spare pin set: 253.1/4A (2.3 and 2.8 mm, 7 g)

Built in Zreče, Slovenia

Unior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The 253 pin spanner is one of those workshop tools where the adjustable design covers a category that's slowly contracting (most modern hubs and BBs have moved away from pin lockrings) but still shows up every week on older bikes and certain premium hubs. We keep it stocked because the alternative is owning five fixed spanners.

Pro tip from our mechanics

The pins are interchangeable for a reason: the wrong pin size in the right hole strips out the hole's edge on the first hard turn. Match the pin to the hole, snug the spanner into the part before you put weight on it, and the cup-and-cone cup drives smoothly. Our workshop hand tools guide covers the rest of the wrench-and-spanner layer of the workshop: Workshop hand tools every bike shop needs →

FAQ

Which pin diameters and spacing does the 253/2DP-US cover? It ships with interchangeable 2.3 mm and 2.8 mm pins. The jaws slide from 10 mm closed to 50 mm open, so one wrench covers the two-hole cups and adjusters that do not share a single pin spacing.

What parts does this adjustable pin spanner actually turn? Two-hole pin-style parts. Unior's service manual uses the 253/2DP on the adjustable left cup of a cup-and-cone bottom bracket, and sometimes on two-hole self-extracting crank caps. It is not a Hollowtech II 16-notch wrench and not a cassette lockring tool; those are spline-engaged.

Are replacement pins available for the 253/2DP-US? Yes. Unior lists a two-piece spare pin set as article 253.1/4A (code 621020): one 2.3 mm pin and one 2.8 mm pin, 7 g the pair, under the same lifetime warranty. We do not currently stock 253.1/4A as its own US product.

What is the 253/2DP-US made of, and how big is it? Premium flex plus carbon steel, entirely hardened and tempered, with black-finish pins and a trivalent chrome plate to ISO 1456:2009. Double plastic dipped handles. The tool is 185 mm long and weighs 123 g. Article 253/2DP-US, SKU 624933, covered by Unior's lifetime warranty.