Crazydave posted this a little over a year ago.
On a stock fender car, the prefered offsets are: Front, 4.75 for 8 inch rim, 5.25 for 9 inch rim, 4.25 for 7 inch rim. Rear, 5.0 for a 9 inch rim, 6 for a 10 inch rim, 6.5 for an 11 inch rim. This is the distance from the mounting surface of the hub to the rear most lip of the rim, NOT THE TIRE BEAD Subtract .25 if your dimentions are to the tire bead
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