What do the letters on tires represent?
2 Answers
Tire 215/55r17 refers to the detailed information about the tire's section width, aspect ratio, and rim diameter. Below is a detailed introduction to tire 215/55r17: 1. 215: 215 represents the tire's section width, measured in mm. 2. 55: 55 is the aspect ratio, which is the ratio of the tire's sidewall height to its section width, with 55 representing 55%. 3. r: r is the abbreviation for radial, indicating the tire has a radial structure. 4. 17: 17 is the rim diameter, measured in inches. 5. Other information: The tire's sidewall may have an arrow or the word OUTERSIDE, indicating the tire's rotation direction; a small umbrella symbol on the sidewall indicates the tire is suitable for rainy or slippery road conditions. Some tires may also include other letters or symbols with special meanings, such as "X" for high-pressure tires, "C" for reinforced tires, "B" for bias-ply tires, and "-" for low-pressure tires.
The letters on the tire actually represent a standardized code that tells you the detailed specifications of the tire. When I bought my car, I paid attention to these details. 'P' stands for passenger vehicle tires, '215' is the width in millimeters, '65' indicates the aspect ratio (height to width), 'R' means it's a radial construction tire, '15' refers to the rim diameter in inches, '95' is the load index capable of carrying approximately 615 kg, and 'H' represents the speed rating up to 210 km/h. Understanding these can help you choose the right tire and prevent mismatches that could affect driving. For example, a lower aspect ratio might result in more road noise, while a higher one could reduce comfort. Regularly checking the tire code can also extend its lifespan and reduce the risk of blowouts. Safety first—if you're unsure, always consult a professional shop.
