Surly 3/32" Single Speed Cassette Cog (Silver) (Splined) (21T)
Surly 3/32" Single Speed Cassette Cog (Silver) (Splined) (21T), Surly Single Speed Cogs. Features: Designed as a singlespeed cog, but may also be stacked and used with 9-speed shifter. Multi gear use will result in slower, less crisp shifting than cogs designed for multi-gear systems Fit Shimano freehub splines SCM 415 hardened chromoly steel Photo for color and material reference only Specs: Drivetrain SpeedsSingle Speed 3/32" MaterialSteel Tooth Count21 Cassette Body TypeShimano 7 Speed