Why tyres burst, and how to reduce the risk
Tyres burst when their structure fails. Low pressure, heat, age, damage and overloading are the main causes, and you can check for them.
Tyron Asia technical team · 2 November 2026 · 4 min read
A tyre bursts when its structure can no longer hold the air inside it. The usual causes are under-inflation, heat, age, impact damage and overloading, and they often act together, so regular pressure and condition checks reduce the risk.
No check removes the risk completely. Each cause below comes with something you can do about it.
Under-inflation
The US road safety regulator, NHTSA, names under-inflation, along with overloading, as a major cause of tyre failure. When pressure is low, the sidewalls flex more than they were designed to. That flexing builds heat inside the tyre and weakens it.
A tyre can look fine and still be well under pressure. Looking is not enough: NHTSA says under-inflation usually cannot be judged by eye, so use a pressure gauge.
What to do: Check pressures when the tyres are cold. NHTSA defines cold as not driven for at least three hours. Use the figure on the label in the driver's door frame or in the owner's manual. The maximum pressure moulded on the sidewall is a different number, so do not inflate to it.
Heat
Heat is the common thread in many tyre failures. NHTSA says excessive speed, under-inflation and excessive loading can each cause heat build-up and possible failure, separately or in combination.
A hot road and a long, fast highway run add to the load on a tyre that is already low on air or carrying too much weight. Michelin links sustained under-inflation directly to overheating and structural failure.
What to do: Check pressures before a long trip, keep to the speed limit, and do not rely on the tyre looking normal.
Age
Rubber changes over time, even when the tread still looks good. Advice varies by tyre maker and market, so follow your tyre maker's guidance. Michelin's global guidance calls for a professional inspection at least once a year once tyres reach five years. It recommends replacing them ten years after manufacture, whatever their tread depth or appearance, and this includes spare tyres. Michelin's Malaysian site gives five years as a general recommendation for replacement and ten years as the maximum.
What to do: Find the four-digit date code on the sidewall. Our guide on how to read your tyre size shows you where it is and how to read it. Check the spare too, since it can sit unused for years.
Damage
Potholes, kerbs and road debris can cause damage that does not show up as a leak straight away. TyreSafe says an impact can cause internal damage, and that a drop in pressure can be a sign of it.
A bulge in the sidewall is a serious warning. Pirelli says a bulge can burst and cause you to lose control, and that it cannot be safely repaired. Michelin lists these signs as reasons to replace a tyre:
- bulges, blisters or bubbles on the sidewall
- cuts deep enough to show the cords
- cracks that open up when the rubber flexes
- any puncture in the sidewall
- damage from being run flat
What to do: After a hard hit, stop when it is safe and look for cuts, bulges and tears. Check the pressure. If you are unsure, have a tyre professional inspect it. Do not drive on a tyre with a bulge.
Overloading
Every tyre has a maximum load, shown by its load index. NHTSA names overloaded vehicles, along with under-inflated tyres, as a major cause of tyre failure. Too much weight makes the tyre flex more, which adds heat. Families on long holiday drives and vans carrying heavy goods are the obvious cases.
What to do: Check your vehicle's load limit in the owner's manual. When replacing tyres, do not fit a load index lower than the vehicle needs. For a heavily loaded trip, use the higher pressure listed on the door label if there is one.
A simple monthly routine
- Check all tyre pressures when cold, including the spare.
- Look around each tyre for cuts, bulges and embedded objects.
- Check the tread. The wear bars in the grooves show the limit.
- Check the date codes and note anything ageing.
- Take any warning light from a tyre pressure monitor seriously.
When checks are not enough
Even a well-kept tyre can be destroyed by road debris or a deep pothole, so it also helps to know what to do when a tyre bursts. The Tyron Multiband does not stop tyres bursting, and it does not replace any of these checks. It is a band fitted under your normal tyre that keeps the flat tyre on the rim, so you keep your steering and brakes while you pull over. If you would like that protection on your car, you can ask for a quote.