Onyx Freehub Driver Assembly Replacement or Repair Do you have Onyx hubs and need a new freehub body? Whether you're replacing an existing freehub body so you can use a Microspline or XDR cassette, or you're replacing a worn-out freehub body, you'll want to get the right one for your hubs. The Onyx Freehub Driver Assembly is a replacement or repair for Onyx hubs. It is compatible with Vesper and MFU-equipped Classic model hubs. It has sealed cartridge bearings. Features Compatible with Vesper and MFU-equipped Classic model hubs Comes with sealed cartridge bearings Available in either Microspline or XDR cassettes | Onyx Racing Products | Onyx Freehub Driver Assembly Micro Spline Alloy