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What does the tire size 120/70-12 mean?

1 Answers

StCassandra

07/29/25 5:38pm

The tire size 120/70-12 indicates: 120 represents the tire section width in millimeters; 70 is the aspect ratio, which is the ratio of the tire sidewall height to the tire section width, with 70 representing 70%. Generally, tire aspect ratios range between 30% and 80%; 12 is the rim diameter in inches. In addition to the size, tires are marked with 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, ZG for steel radial cord tires. Speed rating: Indicates the maximum speed a tire can carry a specified load under specified conditions. Letters A to Z represent certified speed ratings from 4.8 km/h to 300 km/h. Common speed ratings include: Q: 160 km/h; H: 210 km/h; V: 240 km/h; W: 270 km/h; Y: 300 km/h. Rim specification: Indicates the rim size compatible with the tire for practical use. Related information Tire lifespan: The wear life of a tire is between 30,000 to 50,000 kilometers. If the tire has not reached the wear limit or mileage but has been in use for 5 years or has developed significant cracks on the sidewalls, it should be replaced. Tire material: The main component of a tire is rubber. The maximum storage and anti-aging time for rubber, from natural latex to EPDM and nitrile, does not exceed 10 years. The average lifespan of various rubber products in use is 3-5 years.

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