Everything You Ever Wanted To Know About Rims

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Bolt Circle

When considering custom wheels for a specific application, it is imperative that the wheel’s bolt circle matches that of the intended vehicle. The bolt circle is the diameter of an imaginary circle formed by the centers of the wheel lugs. The bolt circle reference is designed to accommodate 4-, 5-, 6- and 8-lug patterns. A bolt circle marked 5-100 (Chevrolet Cavalier, for example) indicates a 5-lug pattern with a diameter of 100mm. Consult the rim manufacturer’s literature for bolt circle information for each application. If there is no information available, you may need to calculate the bolt circle.

4-, 6-, or 8-lug patterns:
Record the distance between the centers of two holes directly opposite one another.

5-lug pattern:
Estimate by measuring from the center of one hole to the far side (outside, not center) of a non-adjacent hole. The diagram below illustrates the proper measuring methods.

Categories: Mustang Tech

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