I'm interesting in knowing this also. I've got a couple of sets of those 11 by 2.5's running around with the 5 on 4 1/2 pattern and the 5 on 5 1/5 pattern that would fit 8 3/4's.

I've changed my 12 x 2.5 to 12 x 3's on my 9 3/4 8 lug single wheel rear.