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I don't get the dimensions listed. Offset is the distance from the centerline of the wheel and is definative of the front and backspacing.
Your 18x8's, 74 + 152mm = 226mm = 8.90 inches, 1/2*226 = 113, 113+44 = 157 should be the backspace for the wheel as spec'd.
18x9's, 83+170 = 253mm = 9.96 inches, 1/2*253 = 126.5, 126.5+44 = 170.5 close enough.
Since rim width is measured between the inside of the rim lips and your measurements may be to the outside edges of the rims, are the lips close to 1/2 inch thick each?
I know that Fuchs 9's will fit under 914 GT flares, but these rims may not, with the numbers listed I can't tell if I'm in the market.
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Eric
'75 914 Renegaded 327 SBC
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