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What does the last letter on a tire mean?

1 Answers

DelLiam

07/29/25 8:54pm

The last letter on a tire indicates its speed rating. Sometimes it's V, sometimes H, etc. Here are the specific details: 1. V means the maximum speed is 240 km/h. 2. H means the maximum speed is 210 km/h. 3. The speed rating indicates the maximum speed at which the tire can carry a specified load under defined conditions. Common speed ratings include: Q: 160 km/h, R: 170 km/h, S: 180 km/h, T: 190 km/h, H: 210 km/h, V: 240 km/h, W: 270 km/h, Y: 300 km/h, Z: ZR speed is above 240 km/h—if ZR appears, such as in P275/40ZR1793W, then the maximum speed rating (the "W" in "93W") is 270 km/h. Below is additional information about tires: 1. Tire markings: Tires are an important component of a vehicle. There are over 10 types of markings on a car tire. Correctly identifying these markings is crucial for selecting, using, and maintaining tires, as well as ensuring driving safety and extending tire lifespan. 2. Tire specifications: Specifications are the geometric parameters and physical performance data of a tire. There are three methods to represent tire specifications: A. Metric (m); B. Mixed metric and imperial; C. Imperial. Imperial tire specifications are often represented by a set of numbers, where the first number indicates the tire section width, and the second number indicates the rim diameter, both in inches. 3. Tire structure: "R" stands for radial tire, while "D" and "-" indicate bias-ply tires. 4. Others: "XL" denotes a locally reinforced tire, "TG" indicates tires for engineering tractors and graders (off-road use), and "NHS" stands for non-highway service tires.

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