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What do the numbers on tire specifications represent?

1Answers
RubyRose
07/28/2025, 09:21:51 PM

Tire specifications, such as 225/50R17. The first number 225 represents the tire width of 225MM, 50 indicates the aspect ratio of the tire cross-section is 50%, meaning the cross-section height is 50% of the width. The letter R stands for radial tire, and 17 denotes the rim diameter of 17 inches. In addition to the specifications, tires also display the following common data: Tire cord material: Represented by Chinese pinyin, such as M-cotton cord, R-rayon cord, N-nylon cord, G-steel cord, ZG-steel radial cord tire. Speed rating: Indicates the maximum speed at which the tire can carry a specified load under defined conditions. Letters A to Z represent certified speed ratings ranging from 4.8km/h to 300km/h. Commonly used speed ratings include: Q: 160km/h; H: 210km/h; V: 240km/h; W: 270km/h; Y: 300km/h; Rim specification: Shows the rim size compatible with the tire for practical use, such as "Standard Rim 5.00F".

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