
Yeah, I see this is a take off on an old posting.
But it peaked my curiosity as to (what's the point) and/or why???
Not for sure, but I believe I selected the tire sizes I ended up going with from Mike at Simple Engineering as a recommendation. Anyway, my rear tires are 315/35 ZR20 Continental tires and I am quite happy with them.
I happen to be a proud owner of a 4 foot steel ruler that has a bubble level included in it. Just now, I went out to the garage and placed the 4 foot ruler against the top middle edge of fender opening until the bubble showed level. Then I took another ruler and from the fattest bulge part of upper tire, I measured the gap. It seems that maybe my rear diff is slightly off center..........the results were a gap of 1 1/4" on the right hand side and a gap of 7/8" on the left hand side.
Let me add that below the seam on the rear facia that wraps around to the fender well........Those tires protrude beyond the fender opening. Anytime a tire spins outside of the protection of the fender well, you're subject to the "sanding" of the paint behind the wheel well.
Given those facts and the protrusion of my own set of tires/wheels, I'm hard pressed to see ANY reasonable need for such wheel spacers.