If your tyres still have tread but you know they are getting on in years, the question of whether to replace tyres over five years old comes up fast — especially before a long trip. Age matters as much as tread depth when you judge whether a tyre is safe, because rubber deteriorates whether you drive on it or not. Here is how the five-year and ten-year guidance actually works in Australia.
Does a tyre need replacing just because it’s five years old?
No. There is no law in Australia that sets a maximum tyre age, and a well-kept five-year-old tyre with even wear and no cracking can be perfectly serviceable. What changes at five years is how carefully you should be watching it. As a guide, Bridgestone Australia recommends that any tyre beyond five years old be inspected by a qualified expert at least once a year. Think of five years as the point where “check it occasionally” becomes “check it every year”.
What actually happens to a tyre as it ages?
Rubber is a living compound. The oils and plasticisers that keep it flexible slowly dry out and break down, so the rubber hardens and loses grip — most noticeably in the wet. Ageing also weakens the bond between the rubber and the internal steel belts, which can eventually lead to sidewall cracking, belt separation and, in the worst case, a blowout. Heat, oxygen and ultraviolet light all speed this up, which is why UV damage and dry rot are such a problem in the Australian climate.
When must an old tyre be replaced regardless of tread?
The widely cited industry and manufacturer guideline is ten years. Bridgestone Australia states that tyres should be removed once they reach ten years of age, regardless of appearance, mileage or actual wear. That ten-year cap applies to every tyre on the car — including the one you rarely look at. If you are unsure how old your unused spare tyre is, treat the same rule as your starting point.
| Tyre age (from date code) | What to do (2026 guide) |
|---|---|
| 0–5 years | Normal checks; monitor tread depth and pressure. |
| 5–6 years | Start a yearly expert inspection; watch for cracking or hardening. |
| 6–10 years | Inspect at least annually; replace at the first sign of cracking, chalkiness or brittleness. |
| 10+ years | Replace regardless of tread or appearance. |
How do I find out how old my tyres are?
Read the DOT date code stamped on the sidewall. On tyres made after 2000, the last four digits tell you the age: the first two are the week and the last two the year — so “2622” means week 26 of 2022. The full code is often moulded only on the inner sidewall facing the vehicle, so you may need to look underneath or check when the wheels are off. Our full walkthrough on how to read the DOT date code covers the older three-digit codes too.
Does where you park change how fast tyres age?
Yes, significantly. Constant sun, high heat and coastal ozone all accelerate ageing, so a car parked outdoors in Queensland or on the coast will age its tyres faster than one garaged in Melbourne. Low-kilometre cars are also at risk: a set that “looks new” because it is barely driven may still be chemically old. If your car sits for long stretches, our guide to tyres for a car that sits unused is worth a read, and the question of whether tyres expire explains why age counts even without kilometres.
Does the ten-year rule apply to caravans, trailers and spares?
Yes — and arguably more so. Caravan, camper and boat-trailer tyres often spend most of their life parked in the sun carrying a static load, so they perish long before the tread wears out. The same goes for a spare that has never left the boot well or the underside of a ute. Because these tyres rack up years faster than kilometres, check their date codes at least as carefully as the ones you drive on, and factor the ten-year cap in even if they look brand new. A blowout on a loaded van at highway speed is exactly the kind of failure the age rule is meant to prevent.
Frequently asked questions
Is it illegal to drive on tyres over five or ten years old in Australia?
There is no specific age limit in the road rules. However, a tyre showing cracking, perishing or other damage can fail a roadworthy inspection, and the 1.5mm legal minimum tread depth always applies. Confirm with your state authority or a tyre fitter if in doubt.
Do unused tyres age too?
Yes. Rubber ages from time and exposure, not just kilometres — see shelf life vs road life.
How can I slow tyre ageing?
Park out of direct sun, keep pressures at the placard figure, and actually drive the car. More detail in UV damage and dry rot.
What other signs mean it’s time?
Cracking, vibration, repeated air loss and uneven wear all count — see when to replace tyres.
Prices, laws and manufacturer guidance change — figures here are a 2026 guide. Always confirm tread and roadworthiness with a qualified tyre fitter or your state road authority. See also Michelin Australia’s advice on how long tyres last.
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