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What is the Explanation of Tire Specification Parameters?

1 Answers

Phillips

07/30/25 6:27am

International standard tire codes are expressed in millimeters to indicate the section height and aspect ratio percentage, followed by: tire type code, rim diameter (in inches), load index (permissible load mass code), and permissible speed code. For example: In 175/70R1477H, 175 represents the tire width of 175MM, 70 indicates the tire's aspect ratio is 70%, meaning the section height is 70% of the width, the rim diameter is 14 inches, the load index is 77, and the permissible speed is H grade. Tire specifications: Specifications are the marking data for the geometric parameters and physical performance of tires. Tire specifications are commonly represented by a set of numbers, with the first number indicating the tire section width and the second number indicating the rim diameter, both in inches. The letters or symbols in between have special meanings: "x" indicates a high-pressure tire; "R" and "Z" indicate radial tires; "-" indicates a low-pressure tire. Ply rating: Ply rating refers to the nominal number of cord layers in the tire rubber, which may not exactly match the actual number of cord layers, serving as an important indicator of tire strength. Ply ratings are marked in Chinese, such as 12-ply; or in English, such as "14P.R" meaning 14-ply. Cord material: Some tires are labeled separately, such as "NYLON," generally marked after the ply rating; some tire manufacturers mark it after the specifications, using the first letter of the Pinyin, such as 9.00-20N, 7.50-20G, etc., where N stands for nylon, G for steel, M for cotton, and R for rayon. Load and pressure: Generally, the maximum load and corresponding pressure are indicated, with the load in "kilograms" and the pressure, i.e., tire pressure, in "kilopascals." Rim specifications: Indicate the rim specifications compatible with the tire for practical use, such as "Standard Rim 5.00F."

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