Abstract: This invention relates to a hub assembly used on axles of a motor vehicle which has an anti lock braking system. The hub assembly consists of a ferrous exciter ring having toothed projections thereon. The exciter ring is cast integral with a hub. The integral cast hub results in a strong assembly that virtually eliminates the possible loosening of the hub and exciter ring, which can result in failure of the device. Also, precision machining of the components is not necessary to permit their assembly. A pick up senses the teeth of the exciter ring as the teeth pass the sensor to detect the relative rotational velocity of the motor vehicle wheel.