Key takeaways
- A tyre carries its age in the DOT code on the sidewall: the last four digits are the week and year it was made.
- Many vehicle and tyre makers advise replacing tyres at around 6 years and treating 10 years as an absolute limit, regardless of tread.
- Rubber hardens and cracks with age, so an old tyre can be unsafe even with plenty of tread left.
- Caravans, trailers and low-mileage cars are most at risk because tyres age by time, not just by miles.
Tyres do not only wear out — they also grow old. The rubber dries, hardens and cracks over the years, which means a tyre with loads of tread can still be past its safe life. This guide explains how to find a tyre's age from the DOT code, what the makers actually say about age limits, and when an older tyre should be swapped before it lets you down.
How old is too old for a tyre?
There is no single UK law setting a maximum tyre age for ordinary cars, but the widely accepted guidance is to have tyres inspected from around 5–6 years old and to replace them by 10 years at the latest, whatever the tread. Several vehicle and tyre manufacturers state this in their handbooks, and ageing rubber loses grip long before it looks worn out.
Age matters more than mileage for tyres that sit still. A spare that has never touched the road, or a caravan tyre used a few weeks a year, can be dangerously old while looking almost new. Time, heat and sunlight do the damage even when the tread does not move.
How do you read the DOT date code?
Every road tyre sold in the UK carries a DOT code moulded into the sidewall, and the last four digits tell you when it was made. The first two are the week of the year and the last two are the year. So a code ending 2419 means the tyre was built in the 24th week of 2019. That is the figure that tells you a tyre's true age.
- Find the letters DOT followed by a string of characters on the sidewall.
- Read the final four digits — for example 0322 = week 3 of 2022.
- The full code may only appear on one side of the tyre, so check both sides if you cannot find it.
- Tyres made before the year 2000 used a three-digit date and should never still be in use.
Why do tyres age even with tread left?
Tyres age because rubber is a perishable material. Over time the oils and compounds that keep it flexible break down — a process called oxidation — and the rubber gets harder and more brittle. A hard, aged tyre grips less, especially in the wet and cold, and is more prone to cracking and, in the worst case, sudden failure even with deep tread.
Heat, sunlight (UV), ozone and big swings in temperature all speed up ageing. So does standing unused, because the flexing of regular driving helps spread the protective compounds through the rubber. This is why a low-mileage car or a stored spare can have old, unsafe tyres long before the tread runs out.
What does an ageing tyre look like?
You can often spot an ageing tyre before its date code confirms it. The clearest sign is fine cracking in the rubber, known as crazing or perishing, usually appearing first in the grooves and on the sidewall. Catching these signs early lets you plan a replacement rather than risk a failure on the road.
- Sidewall cracking — a network of fine cracks where the rubber has dried out.
- Crazing in the tread grooves — small splits at the base of the grooves.
- A hard, shiny surface — aged rubber can feel less supple than a newer tyre.
- Bulges or blisters — a sign of internal damage that means immediate replacement.
If you see deep cracks, bulges or any exposed cords, stop using the tyre and have it checked. For more on spotting tired tyres, see our guide on the signs your tyres need replacing.
Recommended replacement age at a glance
The exact number varies between manufacturers, but the general pattern is consistent: inspect more closely as a tyre passes its fifth or sixth year, and do not keep using tyres beyond about ten years. The table below sums up the typical advice.
| Tyre age | What it means | Action |
|---|---|---|
| 0–5 years | Within normal service life | Check tread and condition routinely |
| 6–9 years | Ageing — inspect closely | Have a professional check annually |
| 10 years + | Past recommended limit | Replace regardless of tread |
Replacing tyres that are past their best
If your tyres are over ten years old, cracking, or you simply cannot find a date code you trust, the safe move is to replace them. Our mobile tyre fitting team checks the DOT date and condition of every tyre during a visit and can supply and fit fresh rubber at your home, work or the roadside across London and central England. If you are unsure, send a photo of the sidewall and we will read the age for you.
Frequently asked questions
For ordinary cars there is no fixed legal age limit, but newer rules ban tyres over 10 years old on the front axles of lorries, buses and minibuses. For cars, the strong guidance is to inspect from about 6 years and replace by 10.
It is moulded into the sidewall, starting with the letters DOT. The age is the last four digits — week then year. The full code sometimes appears on only one side of the tyre, so check both sides if you cannot spot it.
Yes. Tyres age by time as well as use. The rubber hardens and cracks over the years, reducing grip and increasing the risk of failure. An old spare or a low-mileage car can have dangerous tyres that still look almost new.
Keep it cool, dry and out of direct sunlight, away from oils, solvents and ozone sources like electric motors. Even well stored, treat the date code as the guide and replace a spare that is approaching ten years old.
No. It shows when the tyre was manufactured, not fitted. A tyre can sit in storage for a year or more before sale, so always check the DOT code at purchase to avoid buying rubber that is already part-aged.