What is the detailed explanation of the letters and numbers on tires?
2 Answers
The letters and numbers on tires represent: production date, tire size, and specifications. Tires are indispensable components of a car and a crucial part of driving. The letters on tires serve as their identification. Below is a detailed explanation: Production Date: There is always a DOT code on tires. The last four digits of this code represent the production date of the tire. For example, if the last four digits are 1917, the last two digits of the combination represent the production year, which is 2017 in this case. The first two digits represent the production week, which is the 19th week. Therefore, the combination 1917 indicates that the tire was produced in May 2017. Tire Size and Specifications: Tires usually have a code like 205/60R1691V. The numbers and letters may vary, but the format is similar. Here is what each part of the code represents: 205: This indicates the width of the tire in millimeters (mm). 60: This represents the aspect ratio, which is the ratio of the tire's height to its width. A smaller number means the tire is flatter. R: This letter indicates that the tire has a radial structure. Common types are R (radial tire) and D (bias tire). 16: This number indicates that the tire is suitable for a 16-inch wheel rim. 91: This represents the maximum load capacity of a single tire, which is 615 kilograms. For four tires, the total capacity is 2.4 tons. V: This letter indicates the maximum speed rating of the tire, which is 240 km/h.
The alphanumeric combination on tires is quite important, and I learned these details after driving for a long time. For example, take 205/55R16 91V: the 205 at the beginning is the width in millimeters, indicating how wide the tire is; 55 is the aspect ratio, representing the height as a percentage of the width, which affects driving comfort; R stands for radial construction, which most modern cars use; 16 is the rim diameter in inches and must match the wheel; finally, 91 and V represent the load index and speed rating, respectively. 91 means each tire can bear about 615 kilograms, and V indicates a maximum speed of 240 km/h. I’ve seen a friend who chose the wrong tires—they picked ones with a lower load index, resulting in severe shaking at high speeds. Safety comes first. When selecting new tires, always refer to the original manufacturer’s specifications. Don’t just go for the cheapest option, as the wrong choice can affect handling and fuel efficiency. Regularly checking whether the sidewall codes are legible is also crucial.
