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Surly 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.
Features:
Specifications:
Cogs: 17T, 20T, 22T
Size: 3/32" (Single Speed)
Material: Chromoly
Color: Silver
Weight: TBD