
Product ID: 333222338203

Surly
Single Speed Cassette Cog
all about the
Surly Single Speed Cassette Cog
Surly's 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 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. These cogs will work with 6-9-speed 3/32" chains, although we recommend the inherently updated quality of an 8 or 9 speed chain. They are also available in every increment from 13-22t, so you can select that perfect gear.

questions about the
Surly Single Speed Cassette Cog


The 16t Surly Single Speed Cog has an average weight of 62g


What tool do I need to install and do I need spacers/lockring for my Surly single spd hub?


If your hub is a threaded hub, this cog will not work. This is designed to be used with Shimano type freehub bodies. Give us a call directly if you need more help!


Is the width of this cog compatible with a Nuvinci IGH? Do I need any spacers?


The cog width and spline are the same, so it should fit. I don't know why you'd need spacers as there's only one cog on that hub.


I measured a 17t cog at exactly 3" in diameter.


Will these cogs damage an aluminum freehub body?


Should not be a problem for an aluminum freehub. Thanks!


Do you sell the lock nut to attach this to my hope pro hub?


Any Shimano/SRAM compatible lockring should do (such as this one 333222374902). You'll also need a spacer kit (333222338205).


No, they will not.




