Tyres are your vehicle's only contact with the road — and in Perth's conditions, they face specific challenges that accelerate wear and ageing compared to cooler climates. Here's how to know when yours need replacing.
Legal Minimum Tread Depth in WA
In Western Australia, tyres must have a minimum tread depth of 1.5mm across the full width of the tread area. Most tyres have tread wear indicators — small raised sections moulded into the grooves at 1.6mm height. When the tread is level with these indicators, the tyre is legally worn out. Many safety experts recommend replacing at 3mm — tyre performance in wet conditions degrades significantly below this level.
Checking Tread Depth
- Tread wear indicators: visible in the main tyre grooves at the legal limit
- 20-cent coin test: insert a 20-cent coin into the groove — if you can see the full number 20, the tread is below 3mm
- Tread depth gauge: most mechanics have these and can check for free
Tyre Age — Perth's UV Problem
Perth's intense UV radiation and summer heat cause rubber to degrade faster than in cooler climates. A tyre that looks fine may have significant internal cracking or sidewall degradation. Most tyre manufacturers recommend replacing tyres after 6 years regardless of apparent tread condition, and a maximum of 10 years from the date of manufacture. The manufacture date is moulded into the sidewall as a 4-digit code — the last four digits of the DOT code show the week and year of manufacture (e.g., "2319" = 23rd week of 2019).
Other Signs You Need New Tyres
- Visible cracks in the sidewall — indicates rubber degradation
- Bulges or blisters in the sidewall — internal damage, immediate replacement needed
- Vibration through the steering that balancing doesn't fix
- Uneven tread wear — indicates alignment or suspension problems (fix the cause too)
Tyre Prices in Perth
- Budget tyres (small car): $80–$130 each fitted
- Mid-range tyres (sedan/SUV): $130–$220 each fitted
- Premium tyres (sedan/SUV): $200–$400 each fitted
- 4WD all-terrain tyres: $250–$500 each fitted
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