What do the numbers of the tire size mean?
by 
The Curious Bag
ANSWERS: 1
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The first number in a tire size code indicates the overall width in millimeters. The next is the aspect ratio between the sidewall height and the section width. The final number is the rim diameter in inches. A P195/50R15 tire has a 195mm width, a 50 percent aspect ratio, and a 15-inch diameter rim.
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