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Understanding Tire Sizes:
Well most people understand that a tire that is 31x10.50x15, means the tire is 31" tall, 10.5" wide, and meant for a 15" wheel. However, not many understand that a 265/75/15 tire is the metric version of 31x10.50x15. 265 is the width of the tire in millimeters, in this case equal to 10.4". The middle part is what I find people are misinformed about. 75 represents a percentage, the profile of the tire, is 75% of 265 mm, or roughly 7.8". 7.8" of side wall on bottom and top, plus 15" of wheel, makes for an overall height of 30.6". The 15 still means for a 15" wheel.
Related Topics: | How do they measure tires? | Bias vs. Radial Tires: |

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