Surly Track Cog 1/8'' X 19t Silver MFPN=RD19-SR12EPS Mud or loose rocks can’t

Mud or loose rocks can’t knock this out of adjustment

3 ISO Width (mm) 58 ISO Diameter 559 / 26" MTN

and a more stable

Large capacity main compartment with 2 side panels with expandable panniers

Surly Track Cog 1/8'' X 19t Silver MFPN=RD19-SR12EPS Mud or loose rocks can’tSurly 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 19 Size 1 8''