if you use a 9" rim you are spreading the tire out which will make it shorter but the real issue anyways is what your offset is. I run Welds with a 4.5" offset because I like the tires to be at the fender lip and they do rub during a hard impact with 275x50x15. I will roll the lip or just put back on my biggest bump stop so it will not come down that hard.
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