How to Convert Motorcycle Tire Size From Inches to Metric
Converting a motorcycle tire’s diameter from inches to millimeters. Motorcycle tires are rated by several different systems, but in all systems, the diameter of the rim is measured in inches.
Interestingly enough, rim diamter is still expressed in inches, even when using the metric system, which expresses other figures in millimeters. This makes choosing a tire, based on a universal rim size, easier, but if you want to know the size in millimeters, you’ll have to convert it.