American Classic XD Freehub Body
AC's freehub to fit SRAM XX1 11spd cassettes. This will fit all MTB 225 rear hubs with the 17mm axle (will not fit American Classic Terrain hubs)
American Classic say :-
Designed to work with American Classic 17mm mountain hubs. This will not work with Terrain wheelsets.
If you are unsure what hub you have, please check the links below.
MTB Rear Disc 225: Overhaul / Bearing Change
SRAM XD Freehub