How to Read Tire Model Numbers?
2 Answers
Here is the relevant introduction about tire model numbers: 1. Tire DOT marking: (1) There are usually many numbers and letters on a tire, which represent different meanings. Most tires have a DOT marking, which stands for the certification by the U.S. Department of Transportation. (2) Usually, there is also a string of numbers and letters following it, representing the tire's origin information and factory code. The last four digits indicate the tire's production date. The first two digits represent the production week, and the last two digits represent the production year. 2. Other meanings: (1) Some markings indicate the tire brand. M+S means suitable for mud and snow. Some tires may be labeled as MS, M&S, or MS, while others may be labeled as ALL, indicating all-season tires. (2) There are also a series of numbers and letters like 195/60R1588T, which represent the tire's specification parameters.
The tire model is printed on the raised sidewall position, which is that long string of letters and numbers. For example, 225/55R17 97V: the first three digits 225 indicate the tire width in millimeters, 55 is the aspect ratio (the sidewall thickness as a percentage of the width), R stands for radial construction, and 17 means it fits a 17-inch wheel. The last two digits 97V are particularly important—97 is the load index (equivalent to 730 kg), and V is the speed rating (maximum 240 km/h). When replacing tires, these specifications must match the original ones; otherwise, it can affect handling and may even cause the speedometer to be inaccurate. Last time I changed tires, I double-checked for half an hour because getting the wrong model can even make the steering feel heavier.
