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Why Tyres Go Flat: 10 Causes of Tyre Deflation

flat deflated tyre

Whether it’s because you got a bit overzealous when inflating your tyres, or you experienced an untimely puncture on the motorway, tyres become deflated for all manner of reasons. Keep reading to find out the ten main causes of tyre deflation.

1. Wear

Over time, your tyres are guaranteed to wear down. Once this wear and tear reaches a certain point, your tyres are in danger of ripping – something which will inevitably lead to deflation if the rip develops far enough.

Learn more about tyre wear here.

2. Delamination

tyre delamination scheme of a tyre

Tyre delamination is the process by which a tyre separates into its various components parts due to wear, heat, improper inflation or a combination of those things. Eventually, the separation reaches a point where air is able to escape and deflation occurs.

If you’re concerned about tyre delamination, we have just the article for you.

3. Overinflation

While this sounds paradoxical, overinflating your tyres can indeed lead to deflation. This is because overinflating your tyres increases their pressure to dangerous levels, which can lead to a blowout.

4. Underinflation

Improperly inflated tyres are an issue, too. This is because they can become unseated from the rim of the wheel and leak air. However, having your tyres re-seated shouldn’t be too much of an issue in the hands of a professional.

5. Punctures

flat tyre puncture

Whether on your driveway due to a renegade nail, or out on a motorway over a patch broken glass, punctures can occur anywhere. And, more often that not, this will lead to the deflation of your tyres.

6. Leaking valves

The valve stem is the small, cylindrical protrusion which needs unscrewing in order to inflate your tyres. If this becomes corroded or damaged, the valve will leak air slowly, leading to the deflation of your tyres.

7. Hitting the kerb

Any sort of heavy impact on your tyres can cause serious problems, whether it’s just a rip or something structural. Always check your tyres after a knock – you never know, they may have become punctured.

8. Vandalism

While uncommon, it’s fairly simple for vandals to let the air out of your tyres. If your tyres have become deflated but there’s no visible damage to the tyre itself, this could well be the source of the problem.

9. Weather

Extreme weather can cause wear and tear to just about anything, and tyres are no exception. The main problem: heat. While us Brits don’t have to worry too much, extremely high temperatures can cause the air inside your tyres to expand, thus increasing the pressure. When the air expands beyond the limits of the tyre wall, the rubber gives out and the tyre deflates.

10. Tyre bead leaks

Sometimes, air will leak from the tyre bead. This leak can cause the tyre to become flat over time. To check if there’s a problem with the tyre bead, spray your wheels and valve system with soapy water. If a steady stream of tiny bubbles emerges, you probably have a tyre bead leak.


If you have noticed any abnormalities with respect to your tyres’ inflation, this could be a sign of a serious problem – and acting fast is important. Call the experts here at Tyres Northampton to get your tyres back on track today. We offer the best tyres-while-you-wait service in the region, with free hot and cold drinks, customer wifi, tv, xbox and child’s play area. On top of that, our qualified technicians can offer additional services such as wheel alignment, brakes and exhausts. If you would like to know more about what we do, please get in touch with us today.

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