What does the DOT on tires mean?

[StephanieDella]

The DOT on tires stands for certification by the U.S. Department of Transportation. It is usually followed by a series of numbers and letters, which represent 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. Below is some related information: 1. The 11-digit number and letters immediately following "DOT" represent the tire's identification number or serial number. DOT is divided into three levels: A, B, and C, with level C being the lowest, meeting only the minimum performance conditions set by the U.S. Department of Transportation (DOT). The other two levels exceed the DOT's standard requirements. 2. According to U.S. law, all tires sold in the U.S. market must pass DOT testing and have the DOT mark molded on the tire sidewall after certification. Tires without the DOT mark cannot be imported, produced, or sold in the U.S. market. 3. Currently, the tires produced by the company are only sold in the Chinese market and are not exported to the U.S., so the sidewall does not need to be molded with the DOT mark.