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How do you read a tyre's age?
A tyre's age can be read from the DOT code printed on the sidewall: the last four digits show the week and year of manufacture.
Example: 2423 means week 24 of 2023. The code is sometimes on only one side of the tyre, so it may be on the sidewall facing the inside of the car. For the other information printed on the sidewall, read how to read your tyre size.
Why does a tyre age even if it is used little?
A tyre ages even with little use because the rubber compound changes over time under the effect of oxygen, UV rays, heat and temperature swings: it becomes harder and loses elasticity.
A hardened compound offers less grip, especially in the wet and in the cold, even if the tread still looks deep. It is typical of cars that cover few kilometres a year, second cars and spare wheels (see flat or out-of-date spare wheel).
Is there an age limit for tyres?
For cars, the best-known legal criterion concerns the tread (1.6 mm) and the condition of the tyre, not a fixed maximum age. Guidance on age comes mainly from manufacturers.
Many manufacturers recommend having tyres inspected more regularly from about 5 years after manufacture and considering replacing them as the years go by, even if the tread is still sufficient. The guidance varies: check what your tyre manufacturer and vehicle manufacturer say.
Which signs tell you a tyre needs changing?
The main signs are visible to the eye or with a simple check.
- Tread close to or level with the wear indicators: read the legal tread limit.
- Cracks in the sidewall or between the tread blocks, a symptom of an aged compound.
- Bulges or swellings on the sidewall: see a bulge in the tyre.
- Deep cuts or visible cords.
- Deformation or new vibrations while driving.
How can you make your tyres last longer?
Tyres last longer if you keep them at the right pressure and protect them from heat, direct sunlight and impacts.
- Check the pressure at least once a month (see how to check tyre pressure).
- Avoid hitting kerbs and potholes and parking for long periods with the tyre squashed against a kerb.
- If you have a seasonal set, store it out of the light, in a cool, dry place, away from heat sources.
- Have the alignment and balancing checked if you notice uneven wear.
Stranded by an old tyre in Milan?
Aged tyres are more prone to punctures and failures. If you are stuck with a flat tyre in Milan or its province, SOS Tyre comes out 24/7, in 30 minutes on average, to wherever the vehicle is, and assesses on the spot whether the tyre can be repaired.
In an emergency, supplying a new tyre is arranged on the phone depending on size and availability. If your tyres simply need changing because of their age, you can book a tyre change at your home. Call +39 377 326 0999.
Frequently asked questions
Can a new tyre already be a few years old?
Yes, a tyre can sit in a warehouse for a while before it is sold. If stored correctly, away from light and heat, ageing is limited. You can still check the date from the DOT code when it is fitted and ask the seller for information.
Are cracks in the tyre sidewall dangerous?
Small surface crazing is a sign of ageing to keep an eye on. Deep cracks that open up when the tyre flexes, or cracks at the base of the tread blocks, indicate a degraded compound: in that case it is wise to have the tyre assessed and, if necessary, replaced.
Is the DOT code on both sides of the tyre?
Not always. The full code with the date may be printed on only one sidewall, which sometimes faces the inside of the car. If you cannot find it on the outer side, look at the inner sidewall with a torch, or turn the front wheels to see it better.
Do the tyres on a car that is rarely used still need changing?
They may do, even with the tread still deep. With little use the compound still ages and hardens, reducing grip. Check the DOT date and look for cracks, and follow the manufacturer's guidance on the maximum recommended age.