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Originally Posted by OverBoardProject
Flip the wheel on the ground (outside down) and place a straight edge across the rim (but not on to the tire) A scrap 2x2 board is perfect since you might have to cut it to fit.
Then just measure down to the stud holes, and you've got the offset.
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Pay attention to how the offsets are figured. Some offsets are calculated as stated above, but most are measured from the center of the wheel's width.
On certain cars (Like Chevys, the offset is measured from the center of the wheel to the lug pattern plate, for instance; my '85 Corvette has 58mm offsets on 9.5" rims meaning the lug pattern plate is 2.28" from the center of the wheel's 9.5" dimension.