"bravenrace" said:And BTW, an 8" wheel is 1" wider than a 7" wheel, which means a 15x7" wheel with 4.25" backspacing locates the tire further inboard than an 8" wide wheel with 4.50" backspacing.
I don't think this is a correct statement... backspacing is irrelevent to wheel width. A rim with 4.5" backspacing will always go in further than a wheel with 4.25 backspacing. You might be confusing this with offset... A 7"W, 4.25 BS = .75" positive offset, 8"W 4.5 BS = .5" positve offset.