How to Check Your Tyre Pressure

Step 1 — Find Your Car's Correct Tyre Pressure

Every car has a manufacturer-specified tyre pressure, measured in PSI (pounds per square inch) or bar. You'll find it in one or more of these places:

• Inside the driver's door jamb (sticker on the door frame or B-pillar)
• Inside the fuel filler cap
• Your owner's manual

Most cars specify different pressures for front and rear tyres, and often a higher pressure for a fully-loaded car. Always use the correct figure for your situation. Do not use the maximum pressure printed on the tyre sidewall — that's the tyre's structural limit, not the recommended running pressure.

Step 2 — Check the Pressure When Tyres Are Cold

Tyre pressure rises as the tyre warms up from driving. Always check pressure when the tyres are cold — meaning the car has been stationary for at least three hours, or has driven less than 2 miles. If you've just driven to a petrol station, the reading will be slightly higher than the true cold pressure.

Step 3 — Use a Pressure Gauge or Forecourt Pump

1. Remove the dust cap from the tyre valve (the small rubber nozzle on the inner rim).
2. Press your gauge or pump nozzle firmly onto the valve to get a seal.
3. Read the pressure shown on the gauge display.
4. Compare it to your car's specified pressure.
5. Add air if too low; release air (using the small pin on the valve) if too high.
6. Replace the dust cap.
7. Repeat for all four tyres — and check the spare if you have one.

Forecourt pumps at petrol stations are usually free or cost a small fee. You can also buy a digital tyre pressure gauge for under £10 to keep in the car.

How Often Should I Check Tyre Pressure?

At minimum, check your tyre pressure once a month and before any long journey. Tyres naturally lose around 1 PSI per month, so regular checks prevent you from running underinflated without realising it.

Signs Your Tyre Pressure Is Wrong

• Underinflated: tyre bulges at the side, car feels heavy to steer, higher fuel consumption, wear on outer edges of tread
• Overinflated: harsh ride, reduced grip, wear concentrated in the centre of the tread