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So I put some 18x9.5 wheels on the back with a offset of 40 on my 04. Well the tires rub even with the fenders cut. So I'm going to try and get wheels that sit further in. I found a set I really like that are 18x 8.5 with an offset of 38. I know that the lower the number the further they Stick out, but is that true with a tire that is an inch less wide?
 

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Strictly in wheel position you will actually gain clearance with the 2mm shorter backspace of 38mm because you're taking away wheel width too. Tire width affects it a little as too wide of a tire can bulge out past the rim but I think you will be OK. That's almost 1/2"

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