Just because a wheel fits on your car doesn’t mean that a given tire will clear. According to Boze, when sizing wheels you also need to consider what tires you will be trying to run. The three critical numbers here are Outside Diameter, Section Height, and most importantly, Section Width. If you have a wheel with an overall width of 9 inches, and a tire with an inflated section width of 10 inches, then you will need 10 inches of clearance for that combo to work. Also, keep in mind that every tire has an optimum specified wheel width. For example, a 275/35-18 might fit 9- to 11-inch wide wheels, but it’s optimized for a 9.5-inch wide rim. Mounting a tire on a rim width different from its “optimal” width will slightly affect its stated section width.