Surly Track Cog 1/8'' X 15t Silver CheckoutSpec= X-FIRM (BLACK) 100mm-27 100mm - XC30 27.5 A1-A3/30 SILVER 27.5/29 A1 2 AA batteries included

2 AA batteries included

}Wheels Manufacturing 5

} FSA's core line of headsets that have become an industry benchmark\nAll Orbit headsets feature forged and CNC machined 6061 T6 alloy cups

Back Sweep (deg) 9 Bar Clamp Diameter (mm) 25

}SRAM X-Sync Chainring 42 Teeth 110mm BCD Polished Grey/Matte Black

Surly Track Cog 1/8'' X 15t Silver CheckoutSpec= X-FIRM (BLACK) 100mm-27 100mm - XC30 27.5 A1-A3/30 SILVER 27.5/29 A1 2 AA batteries includedSurly Track Cog 1 8'' X 15t Silver. 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. 415 hardened chromoly steel 1. 375" x 24 tpi Photo for color and material reference only TECH SPECS Tooth Count 15