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What do the letters and numbers on tires represent?

2 Answers

CoreyRose

09/06/25 5:29am

The letters and numbers on tires represent: tire brand name, production date, tire size and specifications. Here are the detailed explanations: 1. Tire brand: For example: Sumitomo Rubber, SUMITOMO; Yokohama Rubber, YOKOHAMA; Dunlop, DUNLOP, etc. 2. The four-digit number after DOT indicates the production date: For example, 0511 means the 5th week of 2011; 0613 means the 6th week of 2013. 3. Tire size and specifications: respectively represent: tire width (mm), aspect ratio (%, the percentage of tire thickness to width), tire type code, rim diameter (inches), load index, and speed rating code. 4. Taking 205/60R16-91V as an example: 205 is the width of the tire in millimeters (mm); 60: is the aspect ratio of the tire, which is the ratio of height to width; R: represents that the tire structure is radial; 16: means the tire is suitable for 16-inch rims; 91: indicates the maximum load capacity of a single tire is 615 kilograms. V: represents the maximum speed limit of the tire is 240KM/H.

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StCooper

09/18/25 5:20am

I just bought a car recently and was quite confused by the dense alphanumeric codes on the tires. After searching online, I finally understood them. For example, my tire reads 215/60R16 98H. Here's what it means: 215 indicates the tire width in millimeters—the larger the number, the wider the tire, which offers better grip but consumes more fuel. 60 is the aspect ratio, representing the tire height as a percentage of its width. A 60% ratio is considered medium; a higher ratio provides more comfort but slightly worse handling. R stands for radial construction, which most cars use nowadays. 16 is the rim diameter in inches, and it must match the wheel; otherwise, the tire won't fit. The following 98 is the load index, meaning each tire can carry a maximum of 750 kg—exceeding this increases the risk of a blowout. H is the speed rating, with a maximum of 210 km/h. When replacing tires, don’t choose a lower rating, especially for highway driving. The production date, like 1223, means the 12th week of 2023—always pick recently manufactured tires when buying new ones. Next time I replace my tires, I know not to randomly change the specifications—safety comes first.

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