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The center bore is the size of the machined opening on the back of the wheel that centers the wheel properly on the mounting hub of the car. The centerbore hole is machined to match exactly with the hub so the wheels are precisely positioned as the lug hardware is torqued down. It is important to keep the wheels exactly centered on the hubs when they are mounted because it will reduce the chance of wheel vibration.

Some wheels are vehicle model specific with the correct centerbore to the car to be mounted on. These are known as "Hubcentric." Hubcentric wheels take the stress off the lug nuts, reducing the job of the lug nuts to center the wheel to the car.

Some wheels are designed to fit multiple vehicle models and will use a centering ring system to reduce the bore size to match the hubs of different vehicles. Wheels that are not hubcentric are known as "Lugcentric", as the job of centering is done by the lug nuts when they are properly torqued down. Centerbore on aftermarket wheels must be equal to or greater than that of the hub, or the wheel cannot be mounted on the car. Many aftermarket wheels come with "Hubcentric Rings" that lock or slide onto the back of the wheel to adapt a wheel with a larger centerbore to a smaller hub. These adapters are usually made of plastic but can also be made in aluminum.


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