Your car tyres are one of the most important safety features on your vehicle. They are the only point of contact between your car and the road, so keeping them in top condition is essential for safe driving.
Worn or damaged tyres not only affect performance and fuel economy but also increase your risk of accidents. Knowing when to replace them can save you from costly repairs or dangerous situations down the track.
Many drivers wait too long before replacing their tyres, either because the wear is gradual and hard to notice or because they’re trying to stretch their budget. However, tyres that are past their best can lead to poor grip, longer stopping distances and reduced handling, especially in wet conditions. In this article, we’ll look at the key signs that it’s time for a new set and why acting early is the smart move.
Tread Depth Tells a Big Story
One of the easiest ways to check the health of your car tyres is by measuring the tread depth. In Australia, the legal minimum tread depth is 1.5 millimetres. Anything less than that means your tyres are no longer roadworthy. But even before you reach that limit, performance can start to drop off significantly. Many experts recommend replacing tyres once they wear down to around 3 millimetres, particularly if you drive in wet or slippery conditions.
You don’t need any fancy tools to check your tread depth. Most tyres come with tread wear indicators—small bars of rubber that run across the grooves. When the tread is level with these bars, it’s time for a replacement. Alternatively, you can use a 20-cent coin. Insert it into the groove with the Queen’s head facing down. If you can see the top of her crown, your tread is too shallow.
Even tread wear across the tyre is ideal, but if you notice uneven patterns—like bald patches or one side wearing faster than the other—it could be a sign of poor alignment, unbalanced wheels or suspension issues. In such cases, replacing the tyres is only part of the solution. You’ll also need to fix the underlying problem to prevent it from happening again.
Pay Attention to Tyre Age
Tyres don’t last forever, even if they still have tread left. Rubber degrades over time due to exposure to heat, sunlight and oxygen. Most manufacturers recommend replacing car tyres every six to ten years, regardless of their appearance. After five years, you should have them inspected annually by a professional.
You can check the age of your tyres by reading the DOT code printed on the sidewall. The last four digits represent the week and year the tyre was manufactured. For example, a code ending in “3219” means the tyre was made in the 32nd week of 2019. If yours are over six years old, they may still look fine, but could be compromised on the inside.
Old tyres are more prone to cracking, blowouts and reduced grip. This is especially risky on long road trips or in high-speed driving conditions. If you’re preparing for a holiday or a change in seasons, it’s worth checking the age and condition of your tyres ahead of time.
Visible Damage and Strange Vibrations
Sometimes the signs that it’s time to replace your car tyres are more obvious. Look out for any visible damage like cuts, bulges or punctures that are too close to the sidewall to repair. Tyres that have been driven on while flat or overinflated can develop weak spots, which could lead to sudden failure while driving.
Another common symptom of tyre issues is vibration. If your steering wheel or seat shakes while you’re driving, it could mean your tyres are out of balance, misaligned or have internal damage. Don’t ignore these signs. Have them checked out as soon as possible to avoid more serious issues.
Seasonal Changes and Driving Conditions
Australian weather can be tough on car tyres. High summer temperatures, rough roads and sudden storms all take their toll. If you live in an area with extreme conditions or regularly drive long distances, your tyres will wear out faster than average.
Before the start of a new season or after major road trips, it’s a good idea to inspect your tyres or have a professional do it. Replacing them at the right time can help maintain your car’s performance and safety.
Making the Right Choice
When it’s time to buy new tyres, make sure you choose the right ones for your vehicle, driving needs and local conditions. Not all tyres are created equal. Some are designed for better fuel economy, others for high performance or all-weather grip. Speak to a reputable tyre dealer or your mechanic to find the best match.
Don’t be tempted by the cheapest option just to save money up front. Investing in quality tyres can improve fuel efficiency, ride comfort and—most importantly—safety. It’s one of the smartest investments you can make for your vehicle and peace of mind.
Replacing your car tyres at the right time is essential for safe and efficient driving. Pay attention to tread depth, age, visible damage and changes in handling. By staying proactive and checking them regularly, you’ll extend the life of your tyres, avoid unexpected issues and keep your vehicle performing at its best. When in doubt, seek advice from a tyre professional who can assess your specific needs and keep you rolling safely on the road.
