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What Do the Numbers on Car Tires Mean?

1 Answers

OLillian

07/24/25 5:25pm

Tire data can be categorized into the following types: production date, tire specifications, and whether it is a run-flat tire. It's important to note that all this data is represented by letters or numbers on the tire sidewall. 1. Production date: The four-digit number following DOT indicates the production date. For example, 0712 means the tire was produced in the 7th week of 2012; 1015 means it was produced in the 10th week of 2015. 2. Tire specifications are generally in the following format: (tire width in mm)/(aspect ratio as a percentage of width) R (rim diameter in inches) (load index) (speed rating). For example, 185/60-R17-89H. 3. Whether it is a run-flat tire can usually be determined by the presence of a five-pointed star. However, this is not always accurate, as some brands of run-flat tires may not have the five-pointed star marking.

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