DOT-number Converter
The DOT number on a tire ends in four digits that encode its production date — the week and year it was made. Our DOT-number Converter turns those four digits into an exact manufacturing date, so you know how old your tires are. Just look for the DOT inscription on the tire wall and enter the last 4 digits (see the notation in the picture above).
DOT-number Converter
Useful information regarding the DOT-number converter
1. What is the DOT number and how to “decode” it, ie how does the DOT number converter work?
The DOT number is located on the sidewall of each tire and consists essentially of 12 characters, which can be seen in the 4-4 group of characters. The first 4 groups of characters indicate the place of manufacture and other tire size data, the second 4 are always a specific number regarding the manufacturer (brand), and the last 4 numbers indicate the date of manufacture. The first two digits indicate the week the tire was made, while the last two indicate the year of manufacture. The DOT number calculator uses this information to convert your DOT number into a human-readable date. If the dot number contains only 3 digits, the year of manufacture of the tire is before 2000.
2. What if the DOT number is only 3 digits?
Avoid that tire immediately, the 3-digit DOT number refers to pre-2000 production which is already useless.
3. How much time can I use my tire?
In the case of a car tire, the manufacturer warrants the tire for a certain period of time, which is typically 5 years. Technically the tire is designed for running for about 10 years, but only when it is stored carefully. After the 10th birthday of the tire, the rubber material undergoes changes that make it no longer able to carry out its function properly, and its adhesion is getting worse. Of course, it is also important to see that not only age but profile depth also matters a lot.
Frequently asked questions
How do I read a tire's DOT number?
Find the DOT code on the sidewall and read the last four digits. The first two are the week and the last two are the year of manufacture.
Where is the DOT number on a tire?
It is stamped into the sidewall, usually near the wheel rim, starting with the letters DOT followed by a series of characters.
How old is too old for a tire?
Many manufacturers recommend replacing tires after 6 years and at most 10 years from the date of manufacture, even if the tread looks fine.
What does a DOT code of 2319 mean?
It means the tire was made in the 23rd week of 2019. The first two digits are the week, the last two the year.
Why does tire age matter?
Rubber hardens and cracks with age, so an old tire can be unsafe even with plenty of tread, which is why the production date matters.