From June to September the road does most of the damage. Asphalt in direct sun gets far hotter than the air above it, and a tyre running at motorway speed adds plenty of heat of its own. Most of the shredded tyres you see on the hard shoulder of the E11 in August have the same back story: a tyre that was quietly running low on pressure for weeks.
The good news is that the routine that prevents this is simple and costs almost nothing.
01Check pressure cold, and check it often
Air expands as it heats up. Tyre pressure rises by roughly 0.1 bar (around 1.5 to 2 psi) for every 10°C, so a reading taken straight after a drive will always look higher than it really is.
Check first thing in the morning, before the car has moved, and set the pressure to the figure on the sticker inside the driver’s door frame. Not the maximum number moulded on the tyre; that’s a limit, not a target.
One thing not to do: let air out of a hot tyre because the reading looks high. That’s the pressure behaving normally. Let the tyre cool and check again.
If your car has a tyre pressure monitor, treat it as an early warning rather than a gauge. Many systems only light up once a tyre is around 20 to 25% low, which is already more than you want at motorway speed in July.
In summer, once every two weeks is a good habit. Most petrol stations have free air, and a basic digital gauge costs less than a tank of fuel.
02Low pressure is the real danger
A tyre that’s 20% under pressure flexes more with every turn of the wheel. Flexing creates heat, heat weakens the tyre’s structure, and at 120 km/h on a hot afternoon that can end in a tread separation or a blowout. Underinflated tyres also wear out the outer edges faster and use more fuel.
Overinflation is less dramatic but not harmless. It shrinks the contact patch, makes the ride harsher and wears the centre of the tread.
03Nitrogen: helpful, not magic
Nitrogen escapes through rubber more slowly than ordinary air and carries no moisture, so pressure stays steadier for longer. That’s why we include nitrogen filling when we fit tyres.
It doesn’t mean you can stop checking, though. Punctures, leaking valves and temperature changes affect a nitrogen-filled tyre just like any other. If all you can find is normal air, top up with it. The mix becomes less pure, and that’s all.
04Shade, load and the spare
- Park in the shade when you can. UV is what dries out and cracks sidewalls over time.
- For long trips with a full car or a roof box, use the higher “loaded” pressure shown on the door sticker.
- Check the spare before a road trip to Oman or Ras Al Khaimah. It’s usually the most neglected tyre on the car.
- When you fill up, take ten seconds to look at the tread and sidewalls for nails, cuts or bulges.
If you have a big 4×4 and spend weekends in the sand, pressure matters even more, because you’ll be letting air out and putting it back in. Our guide to tyres for desert driving covers that.
05Know when to stop nursing them
If your tyres are getting old or the tread is close to the wear bars, summer is the worst time to stretch them another few months. Our guide on when to replace your tyres covers what to look for, and the post on reading the DOT date code shows you how to check their age in a minute.
A car pulling to one side or wearing one edge of the tyre is usually an alignment problem rather than a tyre problem. Alignment vs balancing explains the difference.
When it’s time for new ones, look for a recent manufacturing date and the right load and speed rating for your car. You can find your size through the finder, or browse by car, for example the Toyota Camry or Nissan Patrol pages, which list the factory sizes. Every price includes fitting, balancing and nitrogen, so there are no surprises on the day.