Convert your ISO 6-Bolt hubs to fit Shimano HG, Micro Spline, or SRAM XD cassettes using our latest technology. This latest update to our hubs uses a Gen 4 142x12mm axle, an adjusting clamp, and a Gen 4 Mountain driver. 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. Compatible with non-boost ISO 6-Bolt hubs, and Universal Disc Hubs. Serial numbers will begin with 161, 162, 910, 911, 912, or 913. 142x12mm axle. Available with stainless steel or ceramic bearings. Available in Silver or Black. Please contact info@chrisking.com with any compatibility questions.