NEW Surly Cogs Track Cog Surly Track Cog 1/8'' X 19t Silver frontder_clamp-31-8mm Increase foot flexion

Increase foot flexion

Eco-friendly material

Compatible with Sora ST-R3030/3503 STI levers

Aluminum brake and shift levers

Jagwire Sport brake housing packs high performance features into a colorful and durable package

NEW Surly Cogs Track Cog Surly Track Cog 1/8'' X 19t Silver frontder_clamp-31-8mm Increase foot flexionSurly 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. 415 hardened chromoly steel 1. 375" x 24 tpi Photo for color and material reference only