NEW Surly Cogs Track Cog Surly Track Cog 1/8'' X 20t Silver Type_Rims Chainline/Hub Compatibility: 141/148 Boost Hubs

Chainline/Hub Compatibility: 141/148 Boost Hubs

Additional laser-cut texture on lever blades and controls is sweat- and wear-resistant for an enhanced grip

Bike Mount Type: Top Tube

completely re-engineered for 1x systems and the innovative X-Sync 2 chainrings

NEW Surly Cogs Track Cog Surly Track Cog 1/8'' X 20t Silver Type_Rims Chainline/Hub Compatibility: 141/148 Boost HubsSurly 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 Tooth Count: 20