Track Cog

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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 hub s, but this application is not recommended. Track cogs are meant to work on track hubs only. FEATURES: 415 hardened chromoly steel 1.375" x 24 tpi Show more