NEW Surly Cogs Track Cog Surly Track Cog 1/8'' X 18t Silver Type_Brakes the Big Block will hold

the Big Block will hold up its end of the deal

Anodized aluminum

with replaceable gear clusters

Quick and simple yet very effective in carrying one bike as needed

Get training guidance by syncing structured indoor or outdoor workouts to your device from the Garmin Connect™ app or other apps

NEW Surly Cogs Track Cog Surly Track Cog 1/8'' X 18t Silver Type_Brakes the Big Block will holdSurly 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: 18