- Rear hubs feature 6/4 titanium cassette bodies with 3-pawl, 48-point (7.5 degree) engagement \n - XMR hubs are compatible with 6-bolt rotors \n - Uses Enduro ABEC 5 bearings and is easily serviceable/rebuildable \n - XDR models include spacer for XD mtn compatibility \n - Manufactured from U.S. made 6061-T6 aluminum in Petaluma CA