It is not accurate that tires expire after 2-3 years
The "expiry date" of a tire should be calculated from the moment it is installed on the vehicle and 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
In order to verify its statement, a tire company conducted tests in three countries: Germany, South Korea and Saudi Arabia to prove that tires that have been in stock for three years can still provide the same performance level as newly produced tires.
Test results in Arabia show that the performance of tires that have been used for one year is similar to that of tires that have not been used for 10 years. At the same time, in order to test the characteristics of the tire compound, the tires were stored at a constant temperature of 40 degrees Celsius for 20 years. Compared with the tires that had been used for 40,000 kilometers, it was found that the tire compound that had been stored for 20 years would deteriorate faster when used.
Comparative tests were conducted 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. Even so, it is agreed with the British Rubber Manufacturers Association that tires that are 10 years or more from the date of production must be replaced or disposed of.
Tire storage temperature is critical
The European Tire and Rim Technical Organization (ETRTO) recommends that tires be stored at temperatures not exceeding 35°C. A study in Saudi Arabia found that tires stored at 50°C aged twice as fast as tires stored at 40°C and four times faster than tires stored at 30°C.