Surly Track Bicycle Single CogsSurly track cogs are threaded the same as a BMX freewheel (1. 375 x 24 tpi right hand threads). This means that they will fit on single speed rear hubs, as well as BMX freewheel hubs, but this application is not recommended. Track cogs are meant to work on track hubs only.

CE EN1078 (EU)

5 Air retention system provides a secure

Made from AX Suede® pre-curved microfiber

dual-spoke design and bash guards

3300 mAh battery capacity

Gore-Tex waterproof

Clamping System: V2

Die-cut EVA footbed for improved support and long-ride comfort

Superior Durability: Features professional-quality components built for long-term use

The Shimano XTR CN-M9100 Chain is an integral component of the high-end XTR M9100 drivetrain

5" or wider

✅Technical Specs: