i think you could run 315's on stock rims very effectivly with that combo of lift and cutouts actually, but i dont know much about the cutouts themselves, because they dont hack at the stock bumper where you could rub. That would look quite killer actually and would be original and keep your stock shocks and all, my friend has 305 mtr's on his bodylifted 2003 and they look great.
you could fit the 315's on your stockers. It wont look bad. Remember when dixe from the other site had 315s on his stock truck...i thought it looked good. I doubt you would rub when flexing offroad...the Front wont flex veryt much at all to begin with and the rear will tuck. I say go for 315/75s
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