Dimension Splined Single Speed Cog This Dimension Splined Single Speed Cog is a quick and easy way to convert your geared rear wheel to single speed, without needing a new wheel. This cog fits on Shimano/SRAM HG-style freehub bodies, and can be adjusted to accommodate most chainlines with the use of spacers (sold separately). This "-specific cog is optimized for use with single-speed or BMX-specific, " chains. Features Designed for use with " chains including most single-speed-specific chains Splined design for use on a Shimano/SRAM HG freehub body Steel with chromed finish for long-lasting durability | Dimension | Splined Singlespeed Cog 17 Tooth