For compatibility with Shimano 9 + 10-speed HG derailleurs: Use a Mavic M10 wheel, leave the positioning wedge delivered with the wheel on the freewheel body, then mount a Shimano 9- or 10-speed cassette. For compatibility with a Campagnolo 10-speed ED derailleur: Use a Mavic M10 wheel, remove the positioning wedge from the freewheel body, then mount a Mavic M10 cassette. Or, use a Mavic ED10 wheel and mount a Campagnolo ED10 cassette. If you have any questions regarding derailleur or cassette compatibility, please call or stop by.