how to know what size tire to go on your rim
A tire's rim width range identifies the narrowest to the widest rim widths upon which the tire is designed to be mounted during its tens-of-thousands of miles and years of service.. For example, a tire in the P205/60R15 size is measured on a 6.0 wide wheel and this size tire has an approved rim width range from 5.5 to 7.5 wide. The tire has a section width of 8.23 (209mm) when mounted on a 6.0 wide wheel.