Tire TIN and DOT Markings

All Highway tires are marked with a TIN (Tire Identification Number) or DOT code on the sidewall. This code tells you where and when it was made, and includes basic information about the tire’s construction, capacity and characteristics. It is a tire’s ID Code.

The code starts with letters that tell you the manufacturing plant. You can use a chart to figure out which plant it is. If the tire was made before 2015, the plant code has two digits. If it’s a newer tire, the code has three digits.

An example: DOT 10D 9H 1010 1123

Group One: 3 characters representing the factory code for where the tire was made.
Group Two:  a 2-character code indicating the tire size.
Group Three:  up to 4 characters showing the tire type and manufacturer’s code.
Group Four:  4 numbers referring to the week and year the tire was made. For example above 1123 refers to the eleventh week of year 2023.