NEW Surly Cogs Driver and Single Cog Surly Single Cassette Cog 3/32" Splined 21t type_wheels-wheelsets Chain tool

Chain tool

Three compounds in the tread (3C) for increased wear life and better rolling

Bar Clamp Diameter (mm): 21

but the Trio works with them all

Aerospace Mesh

NEW Surly Cogs Driver and Single Cog Surly Single Cassette Cog 3/32" Splined 21t type_wheels-wheelsets Chain toolSurly Single Speed Cogs. 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 Tooth Count: 21 Cassette Body Type: Shimano 7 Speed Material: Steel Drivetrain Speeds: Single Speed 3 32"