18/06/2026
What is DOT?
Every tire has a Department of Transportation (DOT) code molded into its sidewall. This code tells you exactly when and where the tire was manufactured. Knowing this is crucial for safety, as rubber naturally degrades over time regardless of how much tread is left.
The Date Code Breakdown
While the full DOT code can be long, the last four digits are the most important for determining age:
The Format: It is always a 4-digit number (e.g., 2322).
First Two Digits: Represent the week of the year (01 through 52).
Last Two Digits: Represent the year of manufacture.
Example: In the code 2322, the tire was manufactured during the 23rd week of 2022
Note:
Safety Recommendation: Most automotive experts and tire manufacturers recommend replacing tires that are 6 to 10 years old, even if they still have plenty of tread remaining. Over time, the chemical compounds in the rubber break down, leading to cracking, stiffening, and a higher risk of tread separation, especially at highway speeds.
Check for Cracks: If you see dry rot (small cracks on the sidewall), your tires may be aging prematurely and should be inspected by a professional.
Don't Rely on Tread Alone: A tire can have deep tread but still be unsafe due to its age.
