Surly Track Cog 1/8'' X 19t Silver MFPN=FC19-RE12540 It is now 10% lighter

It is now 10% lighter than the Premio 30 carbon shaft with perfect swing weight

5-55mm 350lbs Black

Rode Wool Hat

The SRAM Rival Wide Crankset features a wider stance of the arms and chainrings to provide clearance for extra wide tires giving you the option to explore new more challenging routes

Surly Track Cog 1/8'' X 19t Silver MFPN=FC19-RE12540 It is now 10% lighterSurly 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''