Surly Single Speed Cogs.

• Designed as a singlespeed cog, but may also be stacked and used with 9-speed shifter. Multi gear use will result in slower, less crisp shifting than cogs designed for multi-gear systems
• Fit Shimano freehub splines
• SCM 415 hardened chromoly steel
• Photo for color and material reference only
• Tooth Count: 18
• Cassette Body Type: Shimano 7 Speed
• Material: Steel
• Drivetrain Speeds: Single Speed 3/32″