As with almost all chemical compounds of substances, after a while the composition decreases and changes in form and properties. These same processes can also be observed in tires. This is true for tires in use as well as for those only in storage.
Tires in use vs. Stored tire
Car tires, which are in use, have a different life expectancy at the same tire age as tires in storage. Contrary to the most common misconception, however, stock tires do not in principle last longer. However, this durability does not refer to the tread depth. The legally prescribed depth in the tread of 1.6 mm decreases naturally with use by abrasion, while this does not happen with unused tires. But as described above, the composition and condition of the rubber changes.
Tires, which are driven regularly, wear piece by piece the profile, so that sometime the permissible profile depth is fallen below. This process takes different lengths of time depending on how often they are used. Can not be specified independently. Stored car tires, however, have been exposed to other conditions at high tire age. Since little or no pressure was applied to the car tire, it becomes porous or. Brittle. If the tire is then mounted, the tread wears faster and more irregularly, in addition, the motor vehicle behaves differently.
Approximate safety relevant indications of the tire age
For this reason, there are some approximate tire age figures. A tire in storage, which is not or very little in use, as for example with trailers, should be looked at after 6 years by an expert appraiser and then be replaced by a new one. The safety risk is otherwise too high, as the tire no longer reacts optimally due to the high tire age and does not behave in a safety-compliant manner.
There is also an estimated value for tires in use. If a tire is regularly driven on a passenger car for 10 years, d.H. If it is exposed to the pressure and friction of a surface and after these 10 years it has still not fallen below the critical 1.6 mm mark, this tire may only be driven under the same frequency as before and if possible should not change vehicles, because each vehicle has a different weight distribution and suspension, so that with a different load the tire can no longer provide safety on the track due to the higher tire age.
Determination of tire durability and tire age
How old the tire is is unknown to many drivers, especially if a used car was purchased with car tires attached. At this point a look at the numbers on the tire can help. By the way, the production date of the tires is the four-digit DOT number. It stands on the sidewall of the tire and is here behind "DOT" If, for example, a 0100 is noted between the two following four-digit letter combinations, this means that the tire was manufactured in 01. Calendar week of the year 00 (d.H. 2000) was manufactured.
How old the tire is, is unknown to many riders, especially if a used car was purchased with attached car tires. At this point, a look at the numbers on the tire can provide relief. The production date of the tires is by the way the four-digit DOT number. It is written on the sidewall of the tire and is here behind "DOT" If, for example, a 0100 is noted between the tire number and the two following four-digit combinations of letters, this means that the tire is in the 01. Calendar week of the year 00 (d.H. 2000) was produced. The tire life calculator shows an approximate further life of the tire after a few details about the tire are given.