Surly Single Cassette Cog 3/32" Splined 21t Rise-6mm 1-1/8" kit includes: (1) 5mm

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

The Sportube® Toaster Elite™ is the perfect heated boot bag to fit 2 pairs of (alpine) boots or 1 pair of (Alpine) boots

Designed to be extremely durable using 6069 T6 heat treated aluminum rims with an invisible seamless welded joint

Compatible with the SRAM Red Yaw front derailleur

Surly Single Cassette Cog 3/32" Splined 21t Rise-6mm 1-1/8" kit includes: (1) 5mmSurly 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