Recently, a tire owner roast that some car owners choose the latest tires when they buy them. They "sniff" at tires with a long inventory, and think that tires stored for 2-3 years are "expired tires". Is this really the case? How should tires be stored, what are the factors that affect tire performance, and how long does it take for tires to be considered 'expired'?
It is inaccurate for tires to expire within 2-3 years. Currently, there is no standard worldwide for determining the expiration date of tires, as the damage to each tire depends on various factors such as temperature, load, tire pressure, speed, and even the road conditions on which the tire is used. Therefore, hastily assuming that tires have expired after only 2-3 years of storage is very inaccurate, especially since these tires are stored in a good environment and are not affected by any of the factors mentioned above.
The British Rubber Manufacturers Association explicitly recommends not to install new tires that have been in stock for 6 years or more on vehicles, and requires all tires that have been in use or unused for more than 10 years from the date of manufacture to be disposed of. However, Michelin believes that tires are not as prone to spoilage as fruits, and the "expiration date" of tires should be calculated from the time they are installed and used in the vehicle, not from the manufacturing date. Because tires are only affected by the factors mentioned above during installation and use, causing wear and tear, but not during storage.
When storing tires, they have zero load and zero air pressure, but when installed in the vehicle, they must withstand the pressure and driving effects (such as braking and acceleration, high-speed, rough roads, sharp objects, heavy objects, constantly changing weather and temperature conditions, etc.), which have a greater impact on the tires. For example, even when the vehicle is stationary, the tires must still bear the weight of the vehicle itself. To verify its claim, Michelin conducted tests in three countries: Germany, South Korea, and Saudi Arabia to prove that tires in stock for three years can still provide the same performance level as newly produced tires.
The test results in Arabia show that the performance of tires that have been in use for one year is similar to that of tires that have not been in stock for 10 years. At the same time, in order to test the properties of tire compounds, Michelin stored the tires at a constant temperature of 40 degrees Celsius for 20 years. Compared with tires that had been in use for 40000 kilometers, it was found that tire compounds stored for 20 years deteriorated faster during use.
Comparative tests were conducted on new tires and tires stored for three years in South Korea and Germany, respectively. The results showed that the performance difference between new tires and tires stored for three years can be negligible. Even so, Michelin still agrees with the British Rubber Manufacturers Association's view that tires that have been in production for 10 years or more must be replaced or discarded.
We mentioned above that tires stored at a constant temperature of 40 degrees Celsius for 20 years are more prone to deterioration than tire compounds that have been used for 40000 kilometers. Michelin also pointed out that tire storage must pay attention to storage conditions, and one of the key conditions for correct tire storage is temperature. The European Tire and Rim Technology Organization (ETRTO) recommends storing tires at temperatures not exceeding 35 ° C. A study in Saudi Arabia found that tires stored at 50 ° C age twice as quickly as tires stored at 40 ° C and are four times faster than tires stored at 30 ° C.
In fact, tire shops can explain the issue of inventory tires to car owners without worrying about "expiration". In addition, for tires with longer inventory, low price promotions are often adopted, which is actually a benefit for car owners, safe and reliable, and can be purchased with confidence while saving expenses.
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