At present, there is no standard for determining the expiration date of tires in the world, 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 tires are used.
Therefore, it is quite inaccurate to assume that tires have only been stored for 2-3 years before they expire, especially if these tires are well preserved and not affected by any of the factors mentioned above.
The British Rubber Manufacturers Association specifically advises against fitting new tyres in stock for 6 years or more, and requires that all tyres older than 10 years from the date of manufacture must be disposed of, whether used or unused.
But Michelin believes that tires are not as prone to spoilage as fruit, and the "expiration date" of a tire should be calculated from the moment it is installed on the car, not the date of manufacture. Because tires are only affected by the factors mentioned above when they are installed and used, they will wear out, but not when they are stored.
Tires are stored with zero load and zero air pressure, but are installed on a vehicle and are subject to air pressure and driving effects (braking and acceleration, high speed, 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 must still bear the weight of the vehicle itself.
The European Tyre and Rim Technology Organisation (ETRTO) recommends storing tyres at temperatures not exceeding 35°C. A study in Saudi Arabia found that tires stored at 50°C aged twice as fast as those stored at 40°C and four times faster than those stored at 30°C.
