Learn how to check tyre pressure correctly, where to find the recommended PSI and how often you should check your tyres to stay safe on the road.
Whether you drive a car, van or pickup, keeping your tyres at the correct pressure is one of the easiest ways to improve safety, fuel efficiency and tyre lifespan. Incorrect tyre pressure can affect everything from braking performance to running costs. Both underinflated and overinflated tyres can create problems on the road.
The good news? A tyre pressure check only takes a few minutes.
Safety and vehicle handling
Tyres are the only point of contact between your vehicle and the road. If pressures are too low or too high, it can affect:
- Braking distance.
- Steering response.
- Road grip, especially in wet conditions.
- Vehicle stability when cornering.
- Overall driving comfort.
Underinflated tyres can also generate excess heat, increasing the risk of tyre damage or failure.
Fuel economy and tyre wear
Maintaining the correct tyre pressure can help:
- Improve fuel efficiency.
- Reduce rolling resistance.
- Extend tyre life.
- Prevent uneven tyre wear.
- Lower vehicle running costs.
Even slightly underinflated tyres can increase fuel consumption over time, making regular checks worthwhile.
Finding the correct tyre pressure
Before carrying out a car tyre pressure check, you’ll need to know the manufacturer’s recommended pressure.
You can usually find it:
- Inside the driver’s door frame.
- Inside the fuel filler flap.
- In the vehicle owner’s manual.
- On a tyre pressure information sticker.
Tyre pressures are usually shown in:
- PSI (pounds per square inch).
- BAR.
The correct pressure may differ between:
- Front and rear tyres.
- Lightly loaded and fully loaded vehicles.
Always follow the vehicle manufacturer’s recommendation rather than the maximum PSI printed on the tyre sidewall.
Checking and adjusting your tyre pressure
This is the most important part of the process. Follow these simple steps:
Step 1: Check tyres when cold
Tyres heat up during driving, which causes air pressure to increase temporarily.
For the most accurate reading:
- Check tyres before driving.
- Or wait at least three hours after driving.
Step 2: Remove the valve cap
Unscrew the valve cap from the tyre and keep it somewhere safe.
Step 3: Attach a tyre pressure gauge
Place the gauge firmly onto the valve stem.
You may hear a brief hiss of air. This is normal.
The gauge will display the current tyre pressure.
Step 4: Compare the reading
Compare the reading with the vehicle manufacturer’s recommended PSI.
For example:
- Recommended pressure: 36 PSI.
- Current reading: 31 PSI.
The tyre requires additional air.
Step 5: Inflate or release air as needed
If the pressure is too low:
- Use an air compressor at a petrol station or garage.
- Add air in short bursts.
- Recheck the pressure after each adjustment.
If the pressure is too high:
- Press the centre pin inside the valve to release small amounts of air.
- Recheck after each adjustment.
Step 6: Repeat for all tyres
Check:
- Front tyres.
- Rear tyres.
- Spare wheel (if fitted).
The spare tyre is often forgotten but may be needed in an emergency.
Step 7: Refit valve caps
Once complete, replace all valve caps securely to help keep dirt and moisture out.
Where can I do a tyre pressure check?
You can check tyre pressure using:
- A handheld tyre pressure gauge.
- A digital tyre inflator.
- Petrol station air pumps.
- Many garages and tyre centres.
Additionally, most fuel stations and fast-fit garages offer tyre inflation facilities, often free or for a small charge.
How often should you check tyre pressure?
Experts recommend checking tyre pressures:
- At least once a month.
- Before long journeys.
- Before carrying heavy loads.
- When towing a trailer.
- During significant temperature changes.
Colder weather can reduce tyre pressure, so extra checks during winter are a good idea.
Signs your tyres may need attention
You may need to check your tyre pressure sooner if you notice:
- A tyre pressure warning light.
- Uneven tyre wear.
- Reduced fuel economy.
- Vehicle pulling to one side.
- Heavier steering than normal.
- Tyres visibly looking low.
If any of these symptoms appear, carry out a tyre pressure check as soon as possible.
Frequently Asked Questions
How to check tyre pressure by hand?
It’s difficult to accurately check tyre pressure by hand alone.
While an underinflated tyre may feel softer when pressed, the only reliable way to measure tyre pressure is with a tyre pressure gauge or digital inflator. These provide an exact PSI reading and help ensure your tyres are set correctly.
How to find out tyre pressure by reg?
Some online vehicle information tools allow you to enter your registration number to find manufacturer-recommended tyre pressures.
You can also find the correct pressures:
- Inside the driver’s door frame, typically on a sticker.
- Inside the fuel filler flap.
- In the owner’s manual.
Always verify the details against the information supplied by the vehicle manufacturer.
Where can I get my tyre pressure checked?
Many petrol stations, tyre centres and garages offer free tyre pressure checks.
You may also find free air pumps at:
- Supermarket fuel stations.
- National tyre fitting chains.
- Vehicle service centres.
It’s worth checking locally if you’re looking for a free tyre pressure check near you.
Is 40 PSI too high for car tyres?
Not necessarily.
Some vehicles require pressures close to or above 40 PSI, especially larger vans, SUVs and vehicles carrying heavy loads.
However, if your manufacturer recommends 32 PSI and your tyres are inflated to 40 PSI, they may be overinflated.
Always follow the pressure listed by the vehicle manufacturer rather than using a generic PSI figure.
