The first three-digit number
in the tire size refers to the
tire width. For instance,
in a size P215/65 R15
tire, the width is 215 millimeters. ... For example,
in a size P215/65 R15
tire, the 65 means that the height is equal to 65% of the
tire's width. The bigger the aspect ratio, the bigger the
tire's sidewall will be.
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