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Lets use P205/75 R15

P is for passenger tire (LT would be light truck)

205 is the width of the tread in millimeters

75 is the aspect ratio. That is the height of the side wall as a percenteage of the tread width ( it is 75% of 205mm tall )

R is for a radial tire

15 is the rim size in inches.

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13y ago
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15y ago

The big numbers refer to the size of the tire, rim size, tire height and width, as well as load rating (for example, "LT" refers to Light Truck duty)

Other (smaller) numbers refer to manufacture date, operating temperature, tire wear expectation and other information about the tire.

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Q: What do the numbers in tire size refer to?
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