These fit all Zipp ZR1 hubs that come on current model Zipp 303-404-808 Firecrest wheels, 303 XPLR SW, and 303 SW. XDR will work with 11 speed mtb cassettes with a spacer, 12 speed Eagle cassettes with a spacer and 12 speed road without the spacer This will also work with sram 13 speed XPLR The XDR and HG 11 use the same end cap. So if you are swapping from a HG your current end cap is the same thing. All of these freehub are brand new, never used, and have never had a cassette on them. Some of them may come without original packaging since we swap them out on new sold wheels to fit customers needs and sell the excess stock. FREE SHIPPING
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