Surly Track Sprocket 3/32in

Replacement track sprocket for cassette-type cog.

These cogs have a tall tooth profile that is essential for preventing chain skip from the extra torque a singlespeed drivetrain encounters. In addition to being a stellar SS cog, the cog base width (where it contacts the freehub body) is 4.35mm, so you can stack a few of them up and use a 9-speed shifter for a simplified multi-speed drivetrain. This width also prevents it from ruining the freehub body as a result of digging grooves into it like skinny stamped cogs have a tendency to do.

Surly cogs are machined from SCM415 CroMoly steel, then heat-treated for toughness and chrome-plated for surface hardening and enhanced chain lubricity. The cogs will work with 6-9-speed 3/32" chains, although they recommend the inherently updated quality of an 8 or 9 speed chain. They are also available in every increment from 15-20t, so you can select that perfect gear.