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In the old days, bias ply tires were measured in inches. A standard for many American bikes in the mid century was a 5.00-16, (5" wide for a 16" rim). Now tires are metric with the first numbers the width, in millimeters, followed by the aspect ratio: height to width percentage. Then an alpha, normally the letter "R" for radial, followed by rim size. If that doesnt confuse you they also have alpha designators for size, such as "MT90" would equate to 130/90 which would be pretty close to the original 5.00 tire
 
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