Dot number tire dating
To find your tire's date code, identify the code on the tire that begins with 'DOT'.
Prior to April of 2015, all plant codes were 2 digits, but after April of 2015, a third digit was permissible, and 3 digits are required by April of 2025.
I am aware that many European based tire manufacturers use a different system.
Also, there are different types of tires that require DOT coding.
Please drop me a note if you have a topic you want to see: [email protected] Tire Update April 2015: NHTSA (National Highway and Traffic Safety Administration), the branch of the US government that regulates tires (and in this case, what is required to appear on the sidewall), has annouced that they have run out of 2 digit plant codes (see below) and are making a change to a 3 digit plant code.
I have updated the web page to reflect those changes.
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Also, during the early 1990’s, Continental added a triangle (◄) to the end of the character string to distinguish a tire built in the 1990’s from previous decades (e.g., a tire with the information "DOT XXXXXXX274◄” was manufactured in the 27th week of 1994).