SURLY Single/Speed Cassette Cog - Shimano - 20 Tooth

This high quality single-speed cassette style cog has a wide base, 4.35mm, to prevent it from digging grooves into the freehub body and a tall tooth profile to thwart chain skip.

Material: Machined SCM415 CroMoly, Heat Treated
Spline: Shimano
Chain Compatiblity: 3/32”