Join Date: Apr 2000
Location: Danville, CA USA
If you run the same width tire on a 1" wider rim in the rear, the back of the car will be much more predictable than with a wider tire on that same wheel. This is really important when turning into +100mph corners. You need confidence to know what the rear is going to do.
To get good performance from a given radial tire, the tire width and rim width should be the same. For a 275 tire that is a 10.8" wheel. The vast majority of people run tires that are far too wide for the wheels they are on. If you look at any race class where the tire width is rules limited, but not the wheel width, the wheels are wider than the tire.
After you have run a couple of track days on the wheels and tires rotate the tires between the wheels to even out the wear.
Maximum Motorsports Tech Support