Micro Spline freehubs feature 22 equally spaced angled splines for more positive engagement with the cassette and allows them to be machined from aluminum without the risk of cassette bite Micro Spline freehubs feature 22 equally spaced angled splines for more positive engagement with the cassette and allows them to be machined from aluminum without the risk of cassette bite Compatible with 11 and 12s MicroSpline cassettes only **SHIMANO HUBS ONLY AVAILABLE FOR WHEEL BUILDS**