Very Important Note: Note: Models with Light Duty Brakes Only. Light Duty is 9.68" Diameter Front Rotor, JA1 or JA8 Brake System, 100 mm ( 3.93") Bolt Circle Approved Performance Wheel Hub Assemblies feature superior design and construction and problem-solving innovation. They are engineered to last longer, improve vehicle control, provide a smoother ride, and install easily. These bearings are lubricated, sealed and complete with hub assembly. They provide tight fit to the wheels and transmit power without slipping. These hub assemblies are maintenance free, easy to install and increase product reliability while enhancing performance.