DT Swiss XD Freehub Body for Ratchet Drive Hubs with End Cap Kit for 240/350/440DT Swiss XD freehub and endcap kit DT Swiss Rear Axle Conversion Kits Also used for 12 x 157mm, 12 x 177mm and 12 x 197mm spacing DT 12 x 142mm and 12 x 148mm rear hubs use the same end caps End caps do not convert non Boost hubs to Boost 148mm spacing. DT 142x12mm and 148x12mm hubs simply share the same end caps Item Specifications Rear Axle Type 12mm Thru axle DT Swiss XD Drivers If you are changing from a Shimano Freehub body, you will need new end