Trak+ hub-centric wheel spacers move the wheel out from the hub, effectively widening the stance of the vehicle and lowering its roll center. This simple modification increases lateral stability, which in turn provides improved handling. made from a proprietary aluminum/magnesium alloy which is not only incredibly strong, but also very light weight (up to 70% lighter than a comparable steel product). simply measure the distance from the tire face to the inner wheel lip to determine what width you need.