I'm running 28-12/15 on a 10x15 wheel with 5.5" backspace on my Demon. Narrowed rear, springs moved to frame. The big limiting factor on tire height is the lower portion of the quarter panel at the front of the wheel well. Each car is different I've got an 1 1/2" to 2" space, some have a lot less. I bought tires and wheels before measuring for the rear. Centered them up in the wheel well where I wanted them to sit. I went with the 5.5" backspace due to there being a larger selection of 15" wheels with that backspace.
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