Wheel Spacer Kit 11-1099-1OEM spacers typically wear out within a year of hard riding. 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. These spacers extend bearing life. Features: Manufactured with 52100 bearing steel that is through hardened, precision ground and zinc plated for years of