bfg 285/70/17
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Yes you can SAFELY run a 315/70-17 on your stock 7.5" wide wheel. I did it for several months before I bought my new wheels. Just play with your tire pressure to get max tire contact. As stated in many other threads running that tire on a 7.5" wide wheel, the wear will be as if you are running too much air pressure and MAY cause a slight bit more wear on the center of the tire.