Signs Your Tyres Are Over- Inflated
A practical guide to over inflated tyres for UK drivers, from the CarPal mobile tyre team.
How over-inflation shows up
An over-inflated tyre bulges slightly in the middle, so the centre of the tread carries more load than the shoulders. Over time that produces a distinct strip of wear straight down the middle of the tyre while the edges still look almost new.
That wear pattern is the clearest single indicator. If you can see it, the tyre has been over-inflated for a long time.
What you feel from the driver's seat
The ride becomes noticeably harsher. Expansion joints, potholes and drain covers all transmit more sharply, because the tyre sidewall is doing less absorbing.
Grip in the wet reduces, because the contact patch is smaller. Braking distances lengthen. In extreme cases the car can feel skittish over bumps as the tyres lose contact more readily.
How it happens
Most commonly from someone using the maximum pressure printed on the tyre sidewall instead of the vehicle’s specified pressure. That sidewall figure is the tyre’s structural maximum, not a recommendation, and it is often 10 PSI or more above what your car wants.
It also happens from setting pressures on hot tyres in summer, or from deliberately over-inflating in the belief it saves fuel. The fuel saving is negligible and the grip loss is not.
Fixing it
Let air out until the pressure matches the door sticker figure, checked cold. That is all it takes.
If the centre tread is already visibly worn, the damage is permanent — the tyre will need replacing sooner than it should have, but correcting the pressure stops it getting worse.
Frequently asked questions
What are the signs of over-inflated tyres?
Wear down the centre of the tread, a harsher ride, and reduced grip and braking in the wet.
Is 40 PSI too much for car tyres?
For most family cars, yes. Typical is 30–36 PSI. Some vans and loaded vehicles genuinely specify 40 or more — check your door sticker.
Does over-inflation improve fuel economy?
Marginally, but the loss of grip and accelerated centre wear outweigh it. Correct pressure is the efficient pressure.
Should I use the pressure printed on the tyre?
No. That is the tyre’s maximum, not your car’s requirement. Use the vehicle door sticker figure.
Need help with your tyres?
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