I'm currently running 20 x 8.5's with 245/35/20s I dont rub much at all,only when my wheel is cut all the way to the right and i'm backing up. The funny thing is I'm only rubbing in the front on one side,the left side. It doesn't seem to bad,but it has worn a groove through that protective plastic covering the end of the fender where you can see a little strip of the metal from the end of the fender exposed an a tiny groove in that. What im wondering is,if that groove gets deeper and sharper would it be enough to damage my tires and possibly give me a flat? thanks