This relates to the centre hole in the wheel that centres the wheel on the hub of the car. Since most wheels are mass-produced, they have a large centre bore to accommodate several different vehicles. If this is the case, it is recommended that you use a hub ring. Hub rings are hard plastic or metal ring that fits between the wheel and the vehicle. This centres the wheel perfectly on the hub ensuring that there is no run out when the wheel is installed on to the vehicle. Without hub rings it is possible to get vibrations even if the wheel / tyre assembly is perfectly balanced.
BSA aluminum hub centric rings fit on the outside of your hub "lip" and are designed to create a flush fitment between the inner hub diameter of your BSA wheels and the outer hub diameter of your vehicle. Despite being only a few millimeters thick, a gap between these hub diameters can result in excessive vibrations at high speeds. Proper lug nut torqueing methods can eliminate this risk, but hub centric spacers are recommended whenever your wheels are not hub centric for your specific vehicle.
Aluminum rings are typically recommended for track use, where the heat from the tires and brakes may cause plastic rings to melt or warp.
BSA Engineering is a high quality wheel and wheel accessory manufacturer. BSA also manufactures many OEM wheels, which can be seen on many popular sport compact cars. Made using the highest-grade materials and assembly procedures, BSA products are among the best in their segment.
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