Index
Do tyres have an expiry date? How to tell if yours are past their best
The answer is more nuanced than a simple yes or no. Tyres have a lifecycle. The rubber and other materials they're made from degrade over time, regardless of how many kilometres they've covered.
What tyre expiry actually means
Tyre "expiry" doesn't refer to a fixed cut-off date after which the tyre suddenly stops working. It refers to the natural ageing process of the material itself. Over time, rubber loses its elasticity, hardens and can develop micro-cracks, even if the tyre looks brand new or still has plenty of tread depth. So, appearances aside, tyres do have a shelf life, and it's important to know what that looks like.
It's also worth distinguishing between manufacturing date and useful lifespan. The manufacturing date is the moment the tyre was produced, an objective fact you can verify. The useful lifespan, on the other hand, is the period during which the tyre maintains its optimal safety and performance properties.
As a general rule, most manufacturers and road safety experts recommend replacing tyres at the 10-year mark from their manufacturing date, regardless of how they look or how worn they are.
Factors that can shorten a tyre's lifespan
Several factors can speed up the ageing process:
- Sun exposure: UV rays are one of rubber's biggest enemies, drying it out and causing it to lose flexibility.
- Extreme temperatures: Both intense heat and severe cold can alter the chemical properties of the rubber compound, accelerating its breakdown.
- Storage conditions: A tyre stored in a damp environment, subject to sudden temperature changes, or kept near chemical products will deteriorate more quickly.
- Lack of use: A car left standing for long periods can suffer too. Inactivity can cause deformation and hardening of the rubber.
- Driving style: Aggressive driving, with sharp braking and sudden acceleration, puts tyres under considerably more stress.
How to read your tyre's manufacturing date
Finding out how old your tyres are is surprisingly straightforward, as long as you know where to look. Identifying the manufacturing date will tell you how much service life remains before a tyre reaches the end of its useful lifespan. The key is in the tyre's markings, specifically an alphanumeric code found on the sidewall.
What is the DOT code and how do you read it?
The DOT code (from the US Department of Transportation) is a sequence of characters that provides information about the manufacturer, the production plant and, most importantly for our purposes, the manufacturing date. This detail is essential for understanding tyre expiry. To find this date, look at the last four digits of the DOT code.
Here's how those four numbers work:
- The first two digits indicate the week of manufacture.
- The last two digits indicate the year of manufacture.
For example, if the last four digits of the DOT code read "2523", the tyre was manufactured in week 25 of 2023.
How to tell if a tyre is too old
The golden rule is prevention. Even if a tyre hasn't yet reached the 10-year mark, it's advisable to have it professionally inspected on an annual basis once it's five years old.
Visually, you can look out for signs of ageing such as small cracks on the sidewalls or tread, any visible bulging or distortion, and a noticeable hardening of the rubber. If you're unsure about the type of tyres you're running or their condition, a professional assessment is always your best course of action.
What happens if you drive on expired tyres??
Driving on aged tyres, even if the tread appears adequate, is a risk simply not worth taking. Running past a tyre's expiry date seriously compromises both safety and performance. The consequences can be severe:
- Reduced grip and higher risk of blowout: Hardened rubber loses its ability to grip the road, particularly on wet surfaces, dramatically increasing stopping distances. What's more, micro-cracks can widen over time, raising the risk of a sudden blowout.
- Higher fuel consumption: A tyre that has lost its flexibility creates greater rolling resistance. This forces the engine to work harder to maintain speed, resulting in increased fuel consumption, similar to what happens when tyre pressure is too low.
- Uneven wear and vehicle damage: Aged tyres can deform, leading to irregular wear patterns and vibrations that, over time, can affect the suspension and other vehicle components.
How to avoid tyre-related problems
As with so many things, prevention is your best tool. Follow these simple tips to ensure your tyres are always in top condition:
- Step 1 - Check the DOT when buying: Whenever you purchase new tyres, whether for everyday use or as a spare, always check the DOT code. You want to avoid buying tyres that were manufactured several years ago, as this would shorten their useful life and bring their expiry date closer than expected.
- Step 2 - Regular visual inspections: Once a month, take a few minutes to inspect your tyres for cracks, bulges or uneven wear. Don't forget to check the tread depth too.
- Step 3 - Proper storage: If you keep a set of seasonal tyres, store them somewhere cool, dry and dark, well away from chemical products..
- Step 4 - Respect the lifespan: Even if they look fine, don't take the risk. Replace your tyres as they approach the 10-year mark from their manufacturing date.
Ultimately, road safety starts from the ground up, with tyres in perfect condition. Checking the manufacturing date is a quick, simple habit that gives you real peace of mind. At Moeve, we want you to enjoy every kilometre with complete confidence, knowing that your vehicle is safe for you and everyone who travels with you.
