- Convert any normal HG freehub wheel into a Singlespeed drive - CrMo cog with 7mm thick Hyperglide-spline, 1.8mm tooth thickness - Range of different sized aluminum spacers for fine tuning chainline - Includes 13t cog, alloy lockring, and 7 spacers: 2) 10mm, 1) 5mm, 4) 3mm