Your freehub body needs to be compatible with both the freewheel mechanism of your wheel and the cassette that matches your bike's drivetrain.You'll find here all the freewheel bodies to cover Mavic's diverse types of freewheel mechanisms (ID360, ITS4, FTS-L) and the numerous cassette standards (Shimano HG, XD, XD-R, Microspline, Campagnolo ED, N3W, Singlespeed)**Understanding the different Mavic freehub body acronyms:*** HG or M11 – Shimano HG Road 11/12x (other speeds with spacer)* MS - Shimano Microspline* XD - SRAM XD* XD-R - SRAM XD-R* ED11 - Campagnolo 9/12x* N3W - Campagnolo 13x