Product Description Zipp ZM2 SL End Cap Set for Rear Hub with XD or Micro Spline Freehub These end caps are compatible with the Zipp ZM2 SL rear hub with a Boost installation width of 12 x 148 mm. They include one cap for the left side and one for the right side, the latter of which is compatible with either SRAM XD or Shimano Micro Spline freehubs, depending on the version. The ZM2 SL Disc Center-Lock hub is used in the 1ZERO HiTOP SW MTB wheelset. Compatibility:ZM2 SL rear hub1ZERO HiTOP SW rear wheelManufacturer Numbers:SRAM XD:11.2028.061.002Shimano Micro Spline:11.2028.061.001Contents:1 pair of Zipp ZM2 SL rear hub end caps Manufacturer: SRAM LLC 1000 W. Fulton Market 4th Floor Chicago IL 60607 USA info@sram.com Distributor: SRAM Europe Sales and Services B.V. Paasbosweg 16 3862 ZS Nijkerk Netherlands info@sram.com