Surly Single Cassette Cog 3/32" Splined 20t Diameter-18in so over 90% of the

so over 90% of the road material consists of silica particles in sand and crushed stone that are harder than any metal

Lite race/training tire with grooved lateral tread for traction smooth center

2 Disc Brake Rotor - 180mm 6-Bolt Silver

which is made with layers of strong

Surly Single Cassette Cog 3/32" Splined 20t Diameter-18in so over 90% of theSurly 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 20 Cassette Body Type Shimano HG 7 Speed Drivetrain Speeds Single Speed 3 32" Material Steel