Surly Single Cog Tees Surly cogs are machined from

Surly cogs are machined from SCM415 CroMoly steel

Two-bolt cleat pattern fits all major mountain pedals

quieter rotor with best-in-class heat management

Tool bits are made with premium quality S2 alloy steel for exceptional strength and CNC-cut for precision engagement

to the tune of time-tested and race-tested X-ACTUATION™ technology

Surly Single Cog Tees Surly cogs are machined fromSURLY CASSETTE COG Our cassette type cogs are designed to fit on standard Shimano compatible freehub bodies. 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