Reply to "18x12 narrow body backspace?"

davidnunnMember

George,
12mm offset on a 12" wide wheel equals 7" backspacing. I used the same offset (or 7 1/4" BS) with a 12 1/2" wide wheel and 335/30-18 tire, which is about 3/8" shorter than your 325/25-20. I have absolutely no rubbing after performing the modification I described in my earlier postings but it's VERY tight. Oddly enough, I only experienced rubbing on the passenger side; the driver's side was fine. I didn't have any rubbing issues with the fender lips although rolling them is a good idea.

gen2pantera,
With the backspacing you're about to use, you'll have more fender clearance than the same tire on an 11"/6.5"BS rim because you're pulling the tire more to the inside. The centerline of the tire's tread, mounted on your proposed wheel, will be 1/2" further to the inside than the same tire mounted on an 11"/6.5"BS wheel. I hope this makes sense. I find that it's easier to visualize such things by thinking in terms of offset rather than backspacing.

11/16/097:46 PM

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