Shimano FH-MT400 Freehub Body Description: The Shimano FH-MT400 Freehub Body is a 8-10 speed HG style freehub body for the MT400 thru axle mountain bike rear hubs. This is a factory replacement freehub that will replace a worn or broken freehub, and it will include the freehub body unit and the freehub body washer. Note: This freehub body will also accept 11 speed HG road bike cassettes.