Wheel bearings have a direct impact on the performance and handling of vehicles, making it important to install bearings that you can trust Bearings reduce friction by providing smooth metal balls or rollers, (reduce friction between two objects, which allows moving parts to run) and a smooth inner and outer metal surface for the balls to roll against. These balls or rollers "bear" the load, allowing the device to spin smoothly Bearings extend the working life of wheels, pulleys, and other rotating parts by reducing friction and enabling parts to move smoothly