12x100 mm front thru-axle (12 mm x 100 mm, front)
What a 12x100 mm front thru-axle measures, which bikes use it, and why thread pitch matters as much as the width.
Published dimensions
| Axle diameter | 12 mm axle |
|---|---|
| Hub width | 100 mm hub width |
| Position | front |
| Thread pitch | commonly M12 x 1.5, though 1.0 and 1.75 are also used depending on the fork |
SHELL commonly M12 x 1.5, though 1.0 and 1.75 are also used depending on the fork
SPINDLE see table
SPINDLE see table
Used on: the near-universal front standard on disc-brake road and gravel bikes.
12x100 is the road and gravel front standard: a 12 mm axle in a 100 mm hub, the same width as the old quick-release but with a stiff thru-axle. Thread pitch varies by fork, so measure the pitch and thread length, not just 12x100, before buying a replacement axle.
Frames and related axle standards
Thru-axle on a Trek Emonda SLR (2024 on)12 mm x 100 mm, frontThru-axle on a Specialized Tarmac SL8 (2024 on)12 mm x 100 mm, frontThru-axle on a Canyon Ultimate CF (2020 on)12 mm x 100 mm, front15x100 mm front thru-axle15 mm x 100 mm, front15x110 mm Boost front thru-axle15 mm x 110 mm Boost, frontBSA bottom bracket shellthe frame's other threaded interface
SOURCES: BikeRadar, Road bike axle standards: the complete guide · Modern Bike, How To Measure Bicycle Thru-Axles