The Double Six C single speed kit is our premium level kit featuring a 10mm wide spline base Campagnolo fit cog to ensure power transfer doesnâÂÂt score or destroy alloy freehub bodies. This kit will allow you to quickly convert your wheel to single speed without the need for a new rear hub. Our tapered spacers are designed to offer increased lateral support for the cog under load.This kit is supplied with: 18t CNC and drilled Chromo 5/64âÂÂâ cog 2x CNC and drilled alloy spacers with laser etching. Different thicknesses for chain line adjustment.Lock ringCampagnolo 9 speed onward compatible only.16/17t cogs available separately.