Convert your R45D 6 Bolt Gen. 2 and R45D Centerlock 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, and updated adjusting clamp for a plug-and-play swap. Installation requires a 2.5mm hex key and a T10 Torx tool. Compatible with R45D 6-Bolt Gen.2 hubs. Serial numbers will begin with 6910. Compatible with all R45D Centerlock hubs. Serial numbers will begin with 6710. 142x12mm axle. Available with stainless steel or ceramic bearings. Available in Silver or Black. Please contact info@chrisking.com with any compatibility questions.