What is the explanation of tire specification parameters?
2 Answers
The explanation of tire specification parameters is: The international standard tire code, expressed in millimeters for the section width and the percentage of the aspect ratio, followed by the tire type code, rim diameter (in inches), load index (allowable load mass code), and allowable vehicle speed code. Taking 215/70R15 as an example: The meanings of 215/70R15 are respectively: 215 represents the tire section width, the unit is mm, with an interval of 10mm; 70 is the aspect ratio, which is the ratio of the tire sidewall height to the tire section width, 70 represents 70%, generally the aspect ratio of tires ranges from 30% to 80%. Under normal circumstances, ordinary cars should not use tires with an aspect ratio greater than 75%, while luxury cars and high-performance sports cars are recommended to use tires with an aspect ratio less than 60%; R is the abbreviation of Radial, indicating that the tire has a radial structure, and 15 is the outer diameter of the rim, the unit is inches.
Tire specifications are actually quite important. After driving for so many years, I've accumulated some experience. For example, take 205/55R16 91V: 205 indicates the tire width is 205 millimeters—the larger the number, the wider the tire, which provides better stability at high speeds; 55 is the aspect ratio, meaning the tire height is 55% of the width—a higher percentage offers a more comfortable ride; R stands for radial construction, which most cars use nowadays; 16 is the rim diameter in inches, which must match the wheel hub; 91 is the load index, equivalent to a carrying capacity of 615 kilograms; and V is the speed rating, with a maximum of 240 km/h. Choosing the wrong size, like a slightly smaller rim diameter, can cause the tire to rub against the body, leading to a bumpy ride and potentially affecting the braking system. I think checking the manual or the label on the door frame is the most reliable way to avoid safety hazards. Always inspect the wear condition before replacing tires. Don’t compromise on the wrong specs to save money—once, I rushed into replacing tires with the wrong size, and it caused a sharp increase in fuel consumption and noticeable steering wheel vibrations. I had to visit a professional shop to fix it before I could drive normally again. In short, don’t overlook these small parameters—they directly impact driving safety.
