This photo and the one above it show two different tires on our Duster; one is a Dunlop P235/60R15 (true tire height x width, 24-1/2x99/16) on a 15x7 with 4-inch backspacing and the other is an M/T 28x7.50-15 (really 27-1/4x7-1/6) on a 15x4 with 2-inch backspacing. Note that the closest contact point to the sheetmetal is at the front of the fender opening when the tire is steering. Both tires have about the same clearance, which tells you this: If you want taller tires, they may need to be narrower, and if you want wider tires, you usually have to go shorter to obtain the needed clearance.