What do the model numbers on car tires mean?

1 Answers
BradleyMarie
07/29/25 8:28pm
Tire models can generally be divided into two types: imperial measurement units and metric measurement units, such as 295/80R22.5. The first number, 295, indicates that the tire width is 295mm. The number 80 represents the aspect ratio of the tire section, which is 80%, meaning the section height is 80% of the width. The letter R stands for radial tire, and 22.5 indicates the rim diameter is 22.5 inches. In addition to the model, tires also display the following common data: Tire cord material: Represented by Chinese pinyin, such as M for cotton cord, R for rayon cord, N for nylon cord, G for steel cord, and ZG for steel radial cord tire. Speed rating: Indicates the maximum speed at which the tire can carry a specified load under defined conditions. Letters from A to Z represent certified speed ratings ranging from 4.8km/h to 300km/h. Common speed ratings include: Q: 160km/h; H: 210km/h; V: 240km/h; W: 270km/h; Y: 300km/h. Rim specification: Indicates the rim size compatible with the tire for practical use, such as standard rim 5.00F.
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