SURLY Splined SingleSpeed Cog

Surly cassette cogs are designed first and foremost for single-speed use, but with a little more versatility for Surly to be Surly.

The base cog is 4.35mm wide, and several can be stacked to make a simplified multi-speed drivetrain. In that case, use a 9-speed derailleur.

• Machined from SCM415 chromoly steel
• Heat treated and chrome plated
• Compatible with 6 to 9 speed 3/32" chains
• Available in 13t to 22t