A metric tyre’s section width is measured in millimeters. This measurement is taken from sidewall to sidewall. In this example, the section width of the tire is 205mm.
The “R” in this example indicates radial tyre construction.
This number refers to the height of the sidewall. It is a percentage of the section width. In this example, 65 percent of the section width of 205mm equals 133.25.
This indicates the wheel diameter in inches.
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