Surly Track Cog 1/8'' X 16t Silver CheckoutSpec= SID SL C1 Ultimate - Blue - 100-110mm }SRAM DUB Wide PressFit30 Bottom

}SRAM DUB Wide PressFit30 Bottom Bracket - PF30 73mm Road Black

Features an integrated washer

41-Thermal processed 4130 chromoly

formerly called Master Blaster

Surly Track Cog 1/8'' X 16t Silver CheckoutSpec= SID SL C1 Ultimate - Blue - 100-110mm }SRAM DUB Wide PressFit30 BottomSurly 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 16 Size 1 8''