Two-number Tire Sizing; Lawn tractor tires using the two-number system display numbers as 4.80-8, for example. This means the tire’s width is approximately 4.8 inches and the rim is 8 inches in diameter. Those are the only two numbers you need to find the right size replacement tire.
Tire / Section Width The tire numbers in the above example tell us that the tire is 185 millimeters wide. The first number in this series refers to the tire's section width, or distance from sidewall edge to sidewall edge (in millimeters) when measured up and over the tire's tread.
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