If you have a Reynolds ATR-X rear wheel and need a replacement SRAM XDR Driver or Shimano HG freehub, you are looking at the correct part. This is Reynolds part# 22570 and include the freehub body, internal seal, and washer required for use.

The removal and installation process is not complicated, but if you aren't experienced or have clear instructions, please have a certified bike technician replace your freehub.