Wahoo KICKR XD/XDR Freehub Body Description: The KICKR XD/XDR Freehub Body converts Wahoo trainers for use with SRAM 11, 12, and 13 speed XD-R cassettes. The standard freehub body on the KICKR trainers is Shimano compatible, this freehub is needed when using a SRAM drive train equipped bike. Features: Install on Wahoo KICKR trainers for SRAM AXS freehub compatibility 1.8mm spacer is needed for XD compatibility Includes: XD/XDR Freehub body 1.8mm spacer Original Locknut Updated Tapered Locknut