Choose to pedal even faster by using CeramicSpeed Hub bearings in your wheels. The DT Swiss-3 wheel kit is compatible with 240s Disc hubs. Other kits are available for DT 240s rim brake hubs and also for DT180.The high speed of wheel bearings means bearing friction can have a huge impact on performance. CeramicSpeed Wheel Bearings have a proven lifespan, which is 3-5 times longer than standard wheel bearings. For even lower friction and longer life, you can choose our coated kits. In the package: 2 x 61903/18 bearings 2 x 61802 bearings 2 x 61902 bearings UFO TECH All Round Grease Bearing Decal Remember to add grease and install the seals before installation.