Features: XDR freehub can be compatible with XD Cassette after installing 1.8mm gap, but there are many brands of XD Cassette, and the data of each brand is slightly different, so we provide 2 gaps, 0.8mm and 1.8mm. Please select the thickness of the gap according to your own Cassette data Conversion kit to change the for DT Swiss Ratchet System rotor of 240, 350 hubs to XD/XDR 12 speed rotor standard Version for Thru Axle 12x142/148 mm To make for DT Swiss Ratchet System hubs XD/XDR compatible, the freehub body and end cap needs to be replaced by the new MTB 12 speed freehub body and end cap Made of high strength 7075 aluminum alloy, 3D CNC process The freehub is designed and treated with new hole out design It reduces the weight to 43g on the basis of maintaining the same strength Specifications: Material: Aluminum Alloy Color: Black Package Contents: Freehub body * 1