How to Check Tire Pressure Correctly

Tire pressure is one of the simplest maintenance checks you can do, yet it has a big impact. Underinflated tires flex more, heat up faster, and wear on the edges. Overinflated tires can reduce grip and make the ride harsh. The correct setting is usually listed on a door-jamb placard, fuel flap label, or in the owner’s manual, and it may differ front to rear or for a full load.

For most passenger cars, checking every month is a good habit, and every 10,000-15,000 km (6,000-9,000 miles) you should also inspect the tires for uneven wear, damage, and valve leaks during routine service. Temperature matters too: cold weather can lower pressure, while hot climates, dusty roads, short city trips, towing, and high-speed driving can all change how the tires behave.

1. 1

   Step 1

   1. Park on level ground and let the tires cool. The best reading comes after the car has been parked for at least three hours, or before driving in the morning.

2. 2

   Step 2

   2. Find the recommended pressure. Look on the driver-side door placard, inside the fuel filler door, or in the manual. Some vehicles list different pressures for normal and fully loaded driving.

3. 3

   Step 3

   3. Use a quality tire gauge. Press it firmly onto the valve stem and note the reading. Digital and dial gauges are usually easier to read than cheap pencil-style tools.

4. 4

   Step 4

   4. Adjust the pressure. Add air in small bursts if the tire is low, or release air if it is too high. Recheck after each adjustment because a few seconds can change the reading.

5. 5

   Step 5

   5. Repeat for all tires, including the spare if your vehicle has one. Remember that the spare may need a much higher pressure than the road tires, especially if it is a compact temporary spare.

If your tires are repeatedly losing air, inspect for a puncture, a damaged valve core, a bent wheel, or corrosion around the bead seal. Slow leaks often show up as one tire consistently dropping lower than the others. A tire shop can usually repair a simple puncture, but sidewall damage or severe wear normally means replacement.

Getting tire pressure right can also help you pass vehicle inspections where they apply, such as a US state inspection, a UK MOT, a German TÜV/HU check, or a periodic technical inspection in many EU countries. Requirements vary by country and state, but worn, underinflated, or visibly damaged tires are common reasons for failure.

Should I check tire pressure when the tires are hot?

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It is better to check when the tires are cold, because driving heats the air inside and raises the reading. If you must check after driving, treat the number as temporary and compare all tires consistently rather than trying to make exact adjustments on a hot tire.

How often should tire pressure be checked?

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Check it at least once a month and before long highway trips, heavy loads, or seasonal temperature swings. If your car has a tire pressure monitoring system, use it as a warning tool, but still verify pressures manually because TPMS alerts often come on after a noticeable drop.

What if the door placard and the tire sidewall show different pressures?

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Use the vehicle placard or owner’s manual, not the maximum pressure printed on the tire sidewall. The sidewall number is usually the tire’s limit, while the placard shows the pressure recommended for your specific vehicle and its normal load.