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What is the difference between 99H and 99V tires?

1 Answers

GabrielaAnn

07/29/25 11:13am

The primary difference between the two tires lies in their maximum speed tolerance. The speed rating indicates the highest speed a tire can achieve under specified load and inflation pressure conditions. V and H represent speed ratings, with V designed for a maximum speed of 240 km/h and H for 210 km/h. The number 99 is the load index, indicating the tire's maximum load capacity of 775 kg. Common vehicle models in the market mostly use H and V-rated tires, while some high-performance vehicles utilize W and Y-rated tires. Tire specifications are data that indicate the geometric parameters and physical performance of tires. There are three methods to represent tire specifications: A. Metric (m); B. Mixed metric-imperial; C. Imperial. Imperial tire specifications are typically denoted by a set of numbers, where the first number represents the tire section width, and the second number indicates the rim diameter, both in inches. The most common markings on tires are the tire brand, followed by the tire specifications, and then the load index and speed rating. The speed rating is the maximum speed limit determined during the design and production of the tire after considering various factors and testing. Exceeding this speed can lead to multiple safety hazards. Generally, all-terrain tires (AT) have lower speed ratings compared to highway tires to account for their performance on unpaved roads. Load index and inflation pressure. These typically indicate the maximum load and corresponding pressure, with the load measured in "kilograms" and the pressure (tire inflation) in "kilopascals." The wear limit of the tire is marked on one side with rubber strips or blocks. When the tire wear approaches about 4mm from this limit, replacement should be considered. The so-called three "T" indicators, often seen together on the tire sidewall, are Treadwear (wear resistance), Traction (traction performance), and Temperature (temperature resistance). These three indicators, in addition to conventional parameters like size, speed rating, and load rating, allow consumers to make informed choices about tires, though they are not widely known. Besides the model, tires also bear the following common data: Tire cord material: Indicated by Chinese pinyin, such as M-cotton cord, R-rayon cord, N-nylon cord, G-steel cord, ZG-steel radial cord. 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 4.8 km/h to 300 km/h. Commonly used 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, e.g., standard rim 5.00F.

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