The sidewall height or "aspect ratio" of a 285/75/R16 tire is 75% of 285mm. The sidewall height is a percentage of the width of the tire. The second number on a metric tire is to calculate the side wall measurement. The sidewall or aspect ratio are used in metric tire sizes to determine the overall height of a tire. The third number generally preceded by an "R" is the wheel diameter. Divide this number by 25.4 to get the inch equivalent as there is 25.4 mm in 1 inch. The first number on a metric tire is the width in millimeters. Inch measurement tires are fairly easy to understand however metric tires use a more difficult system to read. Just type in a metric or standard size tire and click calculate. Use our tire size calculator to calculate the diameter, width, sidewall, circumference, and revolutions per mile of any tire.
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