Our cassette cogs are primarily crafted for singlespeeding. But as Surly, we've enhanced their versatility. These cogs have a 4.35mm width at the base, enabling you to stack several for a simplified multi - speed drivetrain. You can use a 9 - speed derailleur for this setup. They're machined from SCM415 Chromoly steel, heat - treated, and chrome - plated. Compatible with 6 - to 9 - speed 3/32' chains, they're available in sizes from 13t to 22t.

How to use: If you're into singlespeeding, just install the cog on your bike as normal. For a multi - speed setup, stack a few cogs according to your needs and use a 9 - speed derailleur. Note: Make sure to check the compatibility with your bike's chain and derailleur before installation. Maintenance: Regularly clean the cog to keep it in good condition. Wipe off dirt and debris after each ride. You can also apply a light coat of lubricant to reduce wear and tear.