Tyres might not be the flashiest part of your car, but they’re one of the most crucial when it comes to safety. Over time, tyres wear out, lose their grip, and can become a real hazard on the road.
So, how do you know when a tyre is too old to be safe? What is a typical tyre lifespan? Let’s take a closer look at the risks, signs of wear, and how to ensure your tyres are roadworthy.
What Happens to Car Tyres as They Age?
Tyres are made of rubber compounds that naturally degrade over time. Exposure to sunlight, heat, and even oxygen causes the rubber to lose its elasticity and strength. This process, known as oxidation, can make tyres brittle and prone to cracking, even if they haven’t been used much.
Here’s what can happen as tyres age:
- Reduced Grip: As the tread wears down and the rubber hardens, tyres lose their ability to grip the road effectively.
- Increased Risk of Blowouts: Cracks and weakened sidewalls increase the likelihood of a tyre bursting under pressure.
- Longer Braking Distances: Worn tyres are less effective at stopping your car quickly, especially in wet conditions.
How Can You Tell if Tyres Are Too Old?
Knowing when to replace your tyres isn’t just about checking the tread depth. Here are some key signs that your tyres might be past their prime:
1. Tyre Cracks and Splits
Inspect the tyre’s sidewalls and tread for visible cracks or splits. These are often a sign of ageing and weakened rubber.
In the worst cases, tread separation can occur, meaning the part of the tyre that contacts with the road can split and seriously compromise your grip. In other cases, a deteriorated side wall can expose the steel belts that keep the tyre’s shape – again leading to possible blow-out of the tyre.
2. Tyre Tread Wear
The legal minimum tread depth in Australia is 1.6mm. If your tyres are getting close to this limit, it’s time for new ones. A handy way to check is with a tread wear indicator built into most modern tyres.
New tyres will have at least 8mm of tread depth, keeping you safe for a long time to come.
3. Tyre Bulges or Blisters
These can develop when the tyre’s internal structure is compromised, creating weak spots that are prone to failure.
4. Tyre Age
Even if your tyres look fine, most manufacturers recommend replacing them after 6 to 10 years. You can find the age of your tyres by checking the DOT code on the sidewall—the last four digits indicate the week and year of manufacture.
Are Old Tyres Ever Safe?
In some cases, tyres that are a few years old but haven’t been used much may still be safe. However, their condition depends on factors like:
- Storage Conditions: Tyres stored in a cool, dry, and dark environment age slower than those exposed to the elements.
- Usage History: Tyres that have been subjected to heavy loads or frequent high-speed driving may wear out faster.
When in doubt, have a professional inspect your tyres to assess their condition.
The Dangers of Driving on Old Tyres
Driving on old or worn tyres isn’t just risky—it’s illegal if they don’t meet safety standards. Here are some of the hazards you could face:
- Loss of Control: Reduced grip and longer braking distances increase the chances of an accident.
- Tyre Blowouts: A sudden burst can cause you to lose control, especially at high speeds.
- Poor Performance in Wet Conditions: Worn tyres are more likely to skid or aquaplane on wet roads.
When Should You Replace Your Tyres?
To stay safe on the road, regularly check your tyres and replace them when necessary. Here’s a quick guide:
- Replace tyres if the tread depth is below 3mm, even though the legal limit is 1.6mm—better grip means better safety.
- Check for cracks, bulges, or uneven wear every few months.
- Replace tyres older than 6 years, regardless of tread condition.
Stay Safe with Auto Hero
Old tyres aren’t just a risk to you—they’re a danger to everyone on the road. If you’re unsure about your tyres’ condition, Auto Hero can connect you with trusted local professionals who can inspect, repair, or replace them with the right tyres for you. With our service, it’s easy to compare providers and find the best deal, so you can drive with confidence knowing your tyres are up to the task.
Written By
Matt Banks
Matt is the founder of Autohero.com.au and has been hooked on cars and repairs ever since childhood.
A veteran in automotive since leaving school, Matt has completed his trade as a panel beater and is across all things with wheels.
His first car was a 1967 FORD XR Wagon followed by a string of collectable Holden’s.
Have a question for Matt? leave a comment below.