Your tyres are the only part of your car that touches the road – and they play a massive role in your safety, handling, and braking. But how do you know when it’s time to replace them? It’s not always about a flat or a blowout. In many cases, worn or aged tyres can be quietly putting you at risk.
Here’s what to look for to know when your tyres need replacing.
1. Check the Tread Depth
Tread depth is one of the most important indicators. In Australia, the legal minimum tread depth is 1.5mm across the central three-quarters of the tyre. Anything less, and your grip on wet roads drops dramatically.
To check:
- Look for tread wear indicators – small bars moulded across the grooves. If they’re flush with the tread, it’s time for new tyres.
- Or use the 20c coin trick: Insert a 20c coin into the tread. If the tread doesn’t reach the bill of the platypus, you’re below 3mm – and should consider replacing the tyre soon, especially before wet season or long trips.
For peace of mind, many tyre experts recommend replacing tyres once they’re below 3mm, even if they’re still legal.
2. Look for Cracks, Bulges or Damage
Tyres don’t last forever – especially with Australia’s heat and tough road conditions. Inspect your tyres regularly for:
- Cracks in the sidewall (a sign of ageing rubber)
- Bulges or bubbles, which can mean internal damage
- Cuts, punctures, or embedded objects
Even if the tread looks okay, structural damage can lead to blowouts. If you spot any of these, get the tyre checked by a professional right away.
3. Pay Attention to Vibration or Handling Changes
If your car suddenly feels different on the road – pulling to one side, vibrating at high speeds, or not braking as confidently – your tyres could be the cause. It may be due to:
- Uneven tread wear
- Tyre delamination (internal separation)
- Out-of-balance or misaligned tyres
Get it inspected early to avoid further damage or unsafe driving.
4. Know the Age of Your Tyres
Even if you don’t drive much, tyres age over time. Rubber hardens, grip declines, and cracks can form. Most tyre manufacturers recommend replacing tyres every 5 to 6 years, even if the tread looks fine.
You can check the age by looking at the DOT code on the sidewall – the last four digits show the week and year of manufacture. For example, "2419" means the tyre was made in the 24th week of 2019.
5. Watch for Uneven Wear
Uneven wear on your tyres might point to:
- Incorrect tyre pressures
- Suspension issues
- Wheel alignment problems
If the inside or outside edges are bald while the rest looks fine, it’s a sign the tyre is wearing out unevenly – and needs attention.
Time for a Check-Up?
If you're not sure whether your tyres are still good, don’t guess. Drop by your local tyre shop for a free inspection. They’ll check the tread, pressure, alignment, and condition – and help you decide if a replacement is needed.
Your safety starts where the rubber meets the road – don’t take chances with worn-out tyres.