What do the numbers on car tires represent?

1 Answers
McRobert
07/30/25 7:05am
The meaning of the numbers on car tires: Taking 255/45R20 as an example: 255 represents the tire section width, 45 represents the aspect ratio, which is the ratio of the tire sidewall height to the tire section width, R indicates that the tire has a radial structure, and 20 represents the outer diameter of the rim. The tire tread width, measured in millimeters, refers to the contact area between the tire tread and the ground. The larger the contact area, the greater the tire's grip, and correspondingly, the greater the resistance. Tires are often used under complex and demanding conditions, enduring various deformations, loads, forces, and high and low temperatures during operation. Therefore, they must possess high load-bearing performance, traction performance, and cushioning performance.
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