Is it good to ripen before aging

How old can new tires be?

If you buy a new tire, you will often receive copies with an older production date. But how far back can that be? And do you have to accept that? Because tires also age and lose performance.

  • There are no legal regulations on the age of tires

  • But: new tires should not be older than two years

  • ADAC test shows: aging changes the technical properties

Anyone who buys a new product assumes that it was manufactured "promptly". But this is not always the case with tires: the multitude of tire dimensions and specifications forces manufacturers and retailers to rationalize production and storage. And that means that even well-seasoned tires go over the counter. Do you have to accept that? How far back can the production date be? And do tires get worse over time?

How to know the age of a tire

A legal basis forAge of tires does not exist - neither for new purchases nor in terms of durability. The legislature in Germany and Europe only regulates the minimum profile depth (1.6 mm).

The driver can tell when a tire was manufactured on the sidewall of the tire: The age is mostly only on one side wall of the tire asfour-digit sequence mostly in the DOT numberimprinted. The complete DOT number consists of three blocks of four characters each. The third number block is relevant for the date of manufacture. It is usually set off in an oval. The first two digits stand for the week of production, the last two for the year of manufacture. In our picture, the sequence of digits 2205 means: 22nd week of production in 2005.

The tire would have been made 14 years ago - and therefore clearly too old even to be an unused tire. Because the fact is:Fresh rubber works best. And ADAC investigations with unused new tires of different ages have shown that the technical properties can change negatively over the years.

Because tires age due tophysical and chemical processesfor example due to weather influences such as UV light, moisture and extremely high or low temperatures. An atmosphere containing ozone, for example, is particularly harmful. Both elasticity and grip of the tire change - and this also applies to tires that are not used or not used much.

It is therefore important to make sure that the tires are as young as possible when buying a new one. Of course, it can happen that a tire was not manufactured in the last few months. ButNew tires should not be older than two years - You can point this out when placing the order.

BRV: "Three-year-old tires are brand new"

That tire more often store longer, justifies the tire trade with the fact that only so theAvailabilitythe tire for the driverensured can be. Because the market is very complex due to the variety of tire sizes, the different variants and specifications. And the tire manufacturers argue that only high-volume production enables economical production, which then turns out to bepositive on the price affects. However, there is no generally applicable legal regulation on the age of tires. Although these are safety-relevant vehicle parts, the consumer looks in vain for a best-before date, as is the case with food or pharmaceuticals on tires.

Everything to do with tires: ADAC members save here

Do you need new tires, rims or complete wheels? At the online tire dealers tirendo.de and reifendirekt.de, ADAC members receive a three percent discount, and at reifendirekt.de an additional discount on assembly.

The Bundesverband Reifenhandel und Vulkaniseur-Handwerk e.V. (BRV) can thereforeNew tires Define in a particularly friendly way for his clientele: "Provided that it is properly and professionally stored, a tire countsup to the age of 3 years as brand new and up toa maximum of 5 years as new.In the case of unused tires that are not more than 5 years old, purchase and installation are technically harmless. However, they then only have a limited useful life. "The association recommends replacing tires with new ones after ten years.

Your problem as a tire buyer: Do you know whether the tire is actually "properly and professionally"was stored?

Our tip:So be on the safe side when placing the order with the 2-year requirement and have the maximum tire age of two years recorded.

When should the tires get off the car?

As part of aADAC investigation five summer and five winter tires, freshly produced, were compared with their three-year-old unused counterparts, which were more or less allowed to grow old in the warehouse. The test engineers checked the braking behavior in the wet, the rolling resistance and (winter tires) the behavior on snow. It was found that thetechnical characteristics through the yearschange negatively can - of course, this also applies to tires that are used on a daily basis, and especially to the grip of winter tires.

Background:The rubber compound of the tirehardens over time, which especially worsens grip and braking distance in wet conditions. This became particularly clear with winter tires, because they have to remain "soft" even at low temperatures. They already lose part of their winter properties from around six years of age, which is why we assume the use ofWinter tires, theolder than eight years are,advise against.Summer tiresshouldnot older than eight to ten yearsbe.

Ten years is enough

Car tires should generally only beup to the age of ten yearsbe used. Especially for vehicles that are regularly converted to winter tires, for second cars with a low annual mileage and also for enthusiast vehicles or vehicles with seasonal license plates, the tires often have to be replaced not because of wear and tear, but simply for reasons of age.

Problems can arise when a broken tire has to be replaced. For example, for a seven-year-old defective tire, it is difficult to find one"suitable" replacement, So to get an identical tire. Then two new tires have to be bought. For safety reasons, the ADAC urgently recommends using the same tires on at least one axle!

A special onelegal requirementIncidentally, there are e on the subject of tire age:Tires for trailers and caravans, which are approved up to 100 km / h, must have aAge of 6 years be replaced.

More ADAC articles about tires

The opinion of the tire manufacturers

Interview withRené Siebeneicher,Engineer in the technical support department ofTire manufacturer Continental.He explains the chemical process of tire aging, why the customer cannot always get goods fresh from the factory and how the type of storage influences the aging process. His conclusion: "Longer storage times ensure the availability of the tires".

Click here for the interview

Question: How can the chemical processes of tire aging be described?

Answer: Under aging of tires all processes are understood that lead to irreversible changes in properties in tire materials over time. The aging is thereby due chemical and physical processes caused.

The chemical aging of the tire is carried out by the oxidation various tire components due to the influence of oxygen / ozone, UV radiation (sunlight), temperature, humidity and time.

The process: The tire's polymer chains are broken down by the oxidation triggered by oxygen (O2) or ozone (O3) split up, as a result of which new cross-links are formed ("post-cross-linking"). Over time, this reduces the component adhesion and elasticity and thus also the tire usage properties.

Higher temperatures and humidity favor the process. Externally, this is done on the tire by the so-called Ozone cracks visible.

Can the manufacturer technically influence the aging process?

In order to counteract the chemical aging processes, the tire compounds static and dynamic anti-aging agents added. The static anti-aging agents form a protective wax film on the surface and thus inhibit, among other things, the formation of superficial ozone cracks. The dynamic anti-aging agents react with oxygen or ozone faster than the polymers and thus protect them.

And does that help?

The anti-aging agents ensure that when used and stored properly the wear limit well before the aging limit is achieved. Noticeable effects of aging processes on driving performance are therefore not to be expected.

When it comes to tire age, are there differences in summer, winter or all-season tires?

Only insofar as the mentioned influencing factors such as UV radiation (sunlight), temperature or humidity seasonal fluctuations subject. This results in relative small deviations in the aging process, but they are absorbed by the anti-aging agents mentioned in all types of tires.

At what age does Continental recommend replacing tires? And are there then differences in the design or the speed index?

There are no technical data that require the replacement of tires from a certain age. Continental recommends that all tires (including the spare tire) that more than ten years ago regardless of the type and speed symbol new tyres be replaced.

This recommendation also applies if the tires are more than ten years old and still appear to be roadworthy. Because drivers cannot rely solely on a visual inspection for rubber cracks, tread wear or other age-related phenomena.

In addition, Continental recommends that the Tread depth should not be less than 3 mm for summer tires and not less than 4 mm for winter tires, otherwise grip and traction will be noticeably impaired. That is what the BRV also says.

Speaking of BRV: Does Continental agree with the BRV view that 3-year-old tires are "brand new" and 5-year-old tires are "as good as new"?

Yes.

Why don't you always get the latest tires? Sausage is also bought fresh ...

There are several factors that go into ensuring availability longer tire storage times can result.

Generally the Complexity of the article Due to the enormous variety of profiles and dimensions, different load index and speed symbol variants as well as deviating OE specifications, it is already very high.

Join in seasonal fluctuations in demand or not always predictable Market meanings. And then the factories have to be fully utilized economically organized become - something for the customer positive effect on the purchase price Has.

Due to the usual storage time for new tires, there are no legal disadvantages either: The Warranty obligation towards the consumer begins with the Time of tire purchase and not when the tire was produced.

Should there be legal regulations on the age of tires?

This is not advisable because the service life and mileage depend on the sum of the storage, operating and service loads. A tire will grow in the course of its life different loads exposed. I am thinking of the load, speed, filling pressure, longitudinal and transverse forces, injuries and much more.

Since these conditions can vary widely, one is Service life forecast or legal application limit solely based on the chronological tire age not possible.

Does storage affect the aging process? And what would be the ideal storage conditions?

A proper storage leads to a greatly slowed down aging process, so that the Tire aging practically only begins with driving.

Ideal storage conditions are: One low ambient temperature and humidity with as little air change as possible, no ozone generating facilities such as electrical machines in the storage area, if possible no direct sunlight as well as the Avoidance of contact with solvents, fuels and lubricants, chemicals, acids or disinfectants. The storage must be in tension-free state take place without pressure, tension or other deformations, with a Long term storage Stand upright in the designated shelves with a distance of at least 10 cm from the floor.

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