Surly Track Cog 1/8'' X 18t Silver ModelNumber=D1430 With an all-new versatile 35mm

With an all-new versatile 35mm capable mount that's designed for over and under handlebar mounting the Velocity SL gives the most customizable and illuminating performance on every ride while USB-C charging powers up quickly and easily

Precision ground

Single bolt fastening and angle adjustment design

Soft and comfortable synthetic liner

Surly Track Cog 1/8'' X 18t Silver ModelNumber=D1430 With an all-new versatile 35mmSurly 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 Size 1 8''