Convert your Superboost Centerlock hubs to fit Shimano HG, Micro Spline, or SRAM XD cassettes using our latest technology. Gen 4 conversion kits include a pre-assembled axle, driveshell, and adjusting clamp for a plug-and-play swap. Installation requires a 2.5mm hex key and a T10 Torx tool. This latest update to our hubs uses a Gen 4 157x12mm axle and a Gen 4 Mountain driver. Compatible with Superboost Centerlock hubs. Serial numbers will begin with 871. Compatible with ISO DH Gen 2 hubs when used with a "Micro Spline" Adjusting Clamp - sold separately. Serial numbers will begin with 291. 157x12mm axle. Available with stainless steel or ceramic bearings. Available in Silver or Black. If your hub already contains a Gen 4 axle, changing cassette interfaces means only changing the driveshell. Please contact info@chrisking.com with any compatibility questions.