Covert your ISO B rear hub to a Shimano Micro Spline driveshell. The Chris King Micro Spline Conversion Kit is complete with 148x12 thru axle, adjustment clamp, drive shell, drive shell internals. Available with steel or ceramic bearings that are made in-house at Chris King. The ceramic bearings run faster than steel bearings and offer a weight saving. The Shimano Micro Spline driveshell makes this mountain bike hub conversion kit compatible with Shimano’s XTR, XT, and SLX mtb groupsets.