Surly Single Cassette Cog 3/32" Splined 21t Rise-6mm Compatible with the SRAM Red

Compatible with the SRAM Red Yaw front derailleur

Industry Nine Torch Road end caps allow the conversion to a variety of road front axle standards

A machined slot fits the L key and converts the entire multi-tool into a tire plug inserter

That enables you to use computer software during your training sessions

1-1/8" kit includes: (1) 5mm

Surly Single Cassette Cog 3/32" Splined 21t Rise-6mm Compatible with the SRAM RedSurly 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 HG 7 Speed Drivetrain Speeds Single Speed 3 32" Material Steel