Single Cassette Cog 3/32" Splined 17t

Surly's 17-tooth single cassette cog is machined from SCM415 chromoly steel, then heat-treated and chrome-plated for a durable, corrosion-resistant finish. The splined design fits standard Shimano-compatible freehub bodies, making it a straightforward option for riders building or replacing a cog on a geared or single-speed setup. Its precise machining keeps shifting smooth and consistent across a range of drivetrain configurations.

This cog works with 6- to 9-speed 3/32" chains and measures 4.35mm wide at its base, allowing several cogs to be stacked together for a multi-speed cassette. Riders assembling a stacked setup should pair it with a 9-speed derailleur and shifter for reliable shifting performance; this cog is a solid building block for custom cassette configurations.

Quick Facts