I have the same dilemma. Bought 15x8 with 4.5" backspace. Mounted 255/70's but it's tight, I can just get my fingers in. Haven't driven yet but will probably go to a 235/70. I didn't move the springs inboard for the same reason, tailpipes. Should be fun with a 511" wedge and street tires.

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An association of men who will not quarrel with one another is a thing which has never yet existed, from the greatest confederacy of nations down to a town meeting or a vestry. Thomas Jefferson