Surly Track Cog 1/8'' X 18t Silver Model=ZipLock Combo Lock bncs-card{border:1px solid #bcc6c1

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}SRAM 44 Tooth 107mm BCD x 4-Bolt 1x12-Speed X-Sync Chainring Polar Gray

Medium/firm density foam with an extra thick nose for technical climbing

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Forged aluminum mounts

Surly Track Cog 1/8'' X 18t Silver Model=ZipLock Combo Lock bncs-card{border:1px solid #bcc6c1Surly 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''