Surly Track Cog 3/32'' X 18t Silver Model=Extended Out-Front Mount Retains its weight rating and

Retains its weight rating and integrity longer than any other light steel spring on the market

adaptor & mounting bolts sold separately

Type MTB Headtube/Quill Diameter 1-1/8` Length 60 Bar Clamp Diameter 31

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Surly Track Cog 3/32'' X 18t Silver Model=Extended Out-Front Mount Retains its weight rating andSurly 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 3 32''