Using these wheel bearings is easy. Just remove the old ones and replace them with these direct - fit Kryptonite wheel bearings. Make sure to check for a proper fit before tightening all the bolts. When installing, use the right tools to avoid damaging the bearings. As for maintenance, regularly inspect the bearings for any signs of wear, like unusual noises or vibrations. Clean the bearings periodically to keep them in good condition. Remember, the warranty only applies if you buy from an authorized dealer and register your product within 90 days. And the warranty doesn't cover Heim Joints. If you notice any issues during normal use, contact the dealer right away for a replacement under the lifetime warranty.