I don't have any rubbing with 31s, but I imagine if I were to go offroad and flex a bit, it wouldn't take much to rub the fenders. However, that's partly because I have a bit of sag in the front after adding a steel bumper and winch. I'm planning on adding a 2" lift to handle that eventually though.Quick question. I have a stock 99 tj sport with 17 inch wheels on it. Im thinking of putting 245/75/17 tires on it but was currious how much they might rub. I dont plan on doing a lot of off roading with it just yet but the 31s lookngood on your jeep and woukd be essentially the same size. Do you rub alot with your set up