![]() This value is found by converting a mile into inches and dividing the result by the tire's circumference: Our tire size calculator can also tell you how many revolutions a tire completes in a mile (or kilometer). So, for our exemplary tire, the tire circumference is: To calculate the circumference, we use the classic circle equation: tire diameter = wheel diameter + (2 × sidewall height).We know the diameter of the wheel is 15 inches, so the diameter of the tire is given by: So, for the tire code shown in the figure above, P215/65R15, you would calculate the sidewall height as: ![]() sidewall height = profile ratio × width / 100.To calculate the sidewall height, we multiply the profile ratio by the tire width (dividing by 100 as the ratio is a percentage). We've got the tire code and the data required for us to calculate various tire measurements, such as the tire diameter and sidewall height. If you found this calculator useful our fuel cost calculator may also be of interest to you. So that's the tire code and tire size explained. In that case, it represents the wheel diameter in millimeters. In some rare cases, the number is three digits long. You might also see the wheel (or rim) diameter given to an accuracy of half an inch. The wheel diameter is indicated by the final 1- or 2- digit number, in inches. If no letter is present, a diagonal tire construction is assumed. ![]()
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