Convert your R45 hubs to fit Shimano HG11, HG12, Micro Spline, or SRAM XDR cassettes with our Gen 4 conversion kit. Gen 4 conversion kits include a pre-assembled axle, driveshell, adjusting clamp, and QR axle ends for a plug and play swap. Installation requires a 2.5mm hex key and T10 Torx tool. Compatible with R45 hubs. Serial numbers will begin with 631. Not compatible with Classic hubs. 130x9mm QR axle. Compatible with all R45D Centerlock hubs. Serial numbers will begin with 6710. 142x12mm axle.