Zipp Freehub Kit Replacement Parts If you need a replacement freehub body or you want to upgrade your current wheels, then you're in the right place. The Zipp Freehub Kit is designed for 176/177 hubs and works with SRAM XDR cassettes. It is compatible with all Zipp wheels that use a 176 or 177 rear hub. The end caps are not included. Features Compatible with 176 and 177 hubs Works with SRAM XDR cassettes End caps not included SRAM part number: 11. 2018. 062. 000 | Zipp | Freehub Kit Xdr | Aluminum