What are the factors that affect tire performance, and how long does it take before a tire is considered "expired"?
It is not accurate that tires expire after 2-3 years
There is currently no standard around the world for determining tire expiration dates, because the damage to each tire depends on many factors such as temperature, load, tire pressure, speed, and even the road conditions on which the tire is used.
Therefore, it is very inaccurate to hastily assume that tires will expire after being stored for only 2-3 years, especially since these tires are stored in a good environment and have not been affected by any of the factors mentioned above.
The British Rubber Manufacturers Association explicitly advises against fitting new tires that have been in stock for six years or more onto vehicles, and requires that all tires that are more than 10 years old from the date of manufacture must be disposed of, whether used or unused.
Tires are not as easy to deteriorate as fruits. The "expiry date" of a tire should be calculated from the moment it is installed on the vehicle and used, not from the date of manufacture. Because the tires will be affected by the factors mentioned above and wear and tear only when they are installed and used, but not when they are stored.
When the tire is in storage, the tire has zero load and zero air pressure, but when installed in the vehicle, it is subject to air pressure and driving effects (braking and acceleration, high speeds, rough roads, sharp objects, heavy objects, changing weather and temperature conditions etc.), these factors have a greater impact on tires. For example, even when the vehicle is stationary, the tires still have to bear the weight of the vehicle itself.
Comparison of new tires and three years of inventory
A company conducted comparative tests in South Korea and Germany on new tires and tires that had been in storage for three years. The results showed that the difference in performance between new tires and tires that had been in storage for three years was negligible.
