After re reading when I posted about the 85% sidewal I realized I hadn't finished. Once that tire has been tested check a 40 or 50 series tire. There will be a difference.
An example from memory was another tech has a mustang with tires wider than stock but the same rim size, the sidewalks stuck out further than stocks. He dropped the pressure by 3.5 psi to prevent center tread deterioration. He was also hard on the throttle and went threw tires in 12000 or every 4th oilchange. He was a crazy guy but he knew how to get a car to hook up off the line.
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