All Balls Front Wheel Spacers 11-1070OE spacers typically wear out within a year of hard riding. OE wheel spacers should be checked and replaced as needed with every bearings service. Water and dirt act as a grinding compound between the seal face and the mating surface of the spacer. Once the grooves are deep enough, the sealing surface is lost, allowing water and dirt to pass through and contaminate the bearing. Designed for years of service even in the dirtiest riding environments.