Surly Track Cog 1/8'' X 15t Silver CheckoutTitle=RockShox Deluxe Ultimate RCT Rear Shock - 185 x 52.5mm provides an optimal balance of

provides an optimal balance of rolling efficiency and longevity to conquer your next journey

The top is flat and low profile and we've used the ideal blend of stiffness/softness in the injection molded foam to allow for good support and power while pedaling

Legendary Ruffian Diamondized Pattern

A spacer kit including four 2 mm spacers is available for purchase to further fine tune Q Factor adjustment

Surly Track Cog 1/8'' X 15t Silver CheckoutTitle=RockShox Deluxe Ultimate RCT Rear Shock - 185 x 52.5mm provides an optimal balance ofSurly 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 15 Size 1 8''