We were determined to fit the 30x9 radial slicks within the wheelwells. The 28x9 slicks had no clearance issues since they were mounted on 15x7-inch rims with 4-inch backspacing. The 15x8 1/2-inch rims have 4 1/2-inch backspacing. We carefully hammered to stretch the inner wheelhouse back 1/2 inch. After the "tweaking," we went for a ride to make sure there was no tire rubbing. There was enough clearance, as seen here at the front of the wheel opening. These 30.0/9.0 slicks (PN 18210) have an actual diameter of 29.5 inches and a tread width of nearly 10 inches. T indicates the circumference, also known as the rollout of the tire. C07 is the rubber compound of the tire, which is a little softer than the D05 of the 28-inch slicks.