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Surly Single Cassette Cog 3/32 20T

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The Surly Cassette Cog is designed to easily fit onto Shimano compatible freehub bodies for easy single speed conversions or because of their width, you can stack a couple of them onto the free-hub and us a 9-speed shifter and chain for a drivetrain that’s as simple or complicated as you like.
Features • Machined from SCM415 CroMoly steel • Compatible with 6 to 9 speed 3/32” chains (9 Speed recommended) • 4.35mm thick • 20t