Another consideration would be the front tires rubbing as you turn, and the suspension is moving up and down. Turn your steering wheel all the way to the right and see how much clearance there is between the outside edge of the tire and the inner fender. Then, check the clearance by turning all the way to the left. My 255/50R19s are 5.02" high, 10.04" wide, with a diameter 29.04". Because of the minimal clearance between the bottom front strut support and my tire, I believe that this may be the largest 50 series tire that can fit on the factory 19" wheels. They are filled to the factory spec, as far as air goes.