8-piece Short Torx Wrench Set

Torx fasteners are a fixture of modern bikes. Disc-rotor bolts moved to Torx because the six-pointed star recess uses more of the available bolt-head material than hex does, which matters most on small fasteners (M5 rotor bolts at 4–6 Nm) where the bolt head doesn't have material to spare. A complete bike-shop Torx wrench set covers T10 through T40; the size range where bicycling Torx fasteners actually live.

This 8-piece set ships in a plastic clip-index, sized for fast deployment without rooting through a tool bag.

What's in the set

Eight Torx wrenches:

• T9
• T10
• T15
• T20
• T25
• T27
• T30
• T40

T25 is the workhorse for rotor bolts; it'll see the most cycles in any shop that services disc brakes. T30 shows up on some crank-arm bolts (especially Shimano Hollowtech II generations). T40 covers larger fasteners and some BB lockring work. The T9, T10, T15, T20, T27 sizes fill out the rest of the cycling Torx range; small accessory fasteners, brake-lever clamps, shifter mounts.

Why dedicated Torx wrenches matter

A Torx wrench is not interchangeable with a hex wrench of the same outer diameter; the recess geometry is fundamentally different. A hex wrench in a Torx recess will round the recess on the first cycle. A Torx wrench in a hex recess will round the wrench tip on the first cycle.

The DIN 11537 dimensional standard specifies the geometry: the precise distance from corner-to-corner across the six-point star, the depth of the engagement surface, the radius at the corners. Wrenches that meet the standard fit; wrenches that drift off-spec strip the recess.

When to step up to TX Plus

A TX Plus profile is an enhanced Torx with additional engagement geometry inside the standard Torx recess. For high-torque applications (crank-arm bolts at 50+ Nm), the TX Plus 1/2-drive socket is the better tool; additional grip area means less chance of cam-out at the top of the torque range. For routine rotor-bolt work at 4–6 Nm, standard Torx is fine.

Specs

• Sizes: T9, T10, T15, T20, T25, T27, T30, T40
• Handle style: short-arm L-shape
• Storage: plastic clip-index
• Dimensional standard: DIN 11537
• Construction: chrome-vanadium steel, hardened and tempered

Made in Slovenia, since 1919

Unior has been forging hand tools in Zreče since 1919, and is the official technical partner of multiple World Tour and downhill teams. Torx geometry is unforgiving of manufacturing drift: a tip that's a few hundredths off across the corner-to-corner dimension will either round the wrench or round the bolt recess. Our manufacturing process holds the dimensional tolerance through the full production run; the tip-shape consistency is what keeps the wrench in service for years.

Pro tip from our mechanics

Replace your T25 wrench at the first sign of tip wear. A worn T25 will round every rotor bolt it touches, and the bolt loses faster than the wrench does. For the framework on which wrench style fits which job: Hex and Torx wrenches for bike work →.