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4-LUG Measure center to center of two holes directly across from each other.
5-LUG Measure from the center on one hole to the OUTER of the third hole. This is the correct way to measure a 5-lug bolt pattern.

Common mistake is to measure from the center on one hole to the center of the third hole.


6-LUG Measure center to center of two holes directly across from each other.
8-LUG Measure center to center of two holes directly across from each other.