MFU Retrofit kit install for Classic Onyx FAT/MTB hubs

Quick walk through on installing your MFU kit on Onyx Classic MTB and Fat hubs.

The MFU (Modular Freehub Unit) was designed during development of the Vesper hub line and now carries over to the Classic line. Allowing the E-bike/Heavy Duty compatibility of our Classic line to adapt to the new Micro Spline (HG+), Sram XDr, Shimano Hyperglide, and Campagnolo freehub bodies.