Sometimes you need a smaller cog, sometimes a bigger one; luckily, the Surly Single Cog caters to your fancy. The machined SCM415 Cro-Moly steel cog features a tall tooth profile to prevent chain skip and work with 6-9-speed 3/32in chains.Available in every increment from 13-22T for perfect gearing\Stackable and derailleur compatible for a multi-speed drivetrain8- or 9-speed chain recommended but will work with 6- and 9-speed 3/32in chainsHeat-treated for ultimate strengthChrome-plated for surface hardening and improved chain lubricityFits Shimano-compatible freehub bodies
a All Mountain Rider
from Occoquan, VA
Date Reviewed: February 15, 2012
Strengths: Well priced, because this cog will last you forever if you pair it with a surly ring. You will go through a ton of chains before you need to replace this little guy. Wide base is great on freehubs, it won't chew them up. It looks great too. Comes in a bunch of different sizes and both chain widths. I prefer 1/8ths. Nice tall teeth, never worry about the cog slipping under torque.
A great product from Surly. A steel cog, so simple and logical. Your chain is steel, so if you run an alloy cog it will get beaten up by the chain. I like my Surly cog and chainring a lot. They perform seamlessly. Get it and you won't be disappointed.