I've had that problem and the only fix that I have found is to either use smaller tires or do like I did and cut the fender brackets off and get you some 1/4" galvanized steel rod and bend it to hold the fender out of the way enough that when the shock is compressed it does not rub then weld it in place. It does take a little thinking and fitting before you weld it though. Oh and make sure your tires are turned when the shock is compressed before you weld so you can be sure it is not touching......Hope this helps.