Finally. A massive tire size chart with both metric and inch tire sizes listed to easily compare every tire size in one spot. Here are two tire size charts that list every tire by wheel size or by diameter to make your search as simple as possible. Each metric tire measurement shows both the metric tire size and the inch equivalent. To calculate a metric tire size into inches you multiply the first number by the second number devided by 100 which gives you the sidewall height in millimeters, divide it by 25.4 to convert it to inches. The overall diameter is then the wheel diameter plus 2 sidewall measurements, and divide the first number by 25.4 to calculate the width in inches ..... How about you just click the blue tabs to see a list of tire sizes and their conversions.