What Tire Pressure Should My Tires Be? (And How to Check It)

# What Tire Pressure Should My Tires Be? (And How to Check It)

Set your tires to the pressure on the sticker in your driver's door jamb, not the number on the tire's sidewall. For most cars and SUVs that is 30 to 35 PSI, checked cold before you drive. The sidewall figure is the tire's maximum safe pressure, a limit rather than the target your car was designed around. The sidewall number is the tire's maximum pressure, a safety limit, not the pressure your car is designed to run. Using the door-jamb figure gives you the best grip, the longest tread life, and the best fuel economy your tires can deliver.

Tire pressure is the cheapest, easiest thing you can do to make your tires safer and last longer, and it is also the most commonly gotten wrong. The confusion almost always comes down to one thing: which number to trust. This guide clears that up, shows you exactly where to find your correct pressure, and walks through how to check and set it properly in about five minutes.

What tire pressure should your tires be?

Whatever the placard in your driver's door jamb says, which for most cars and SUVs is between 30 and 35 PSI. Check it cold, before you drive or after the car has sat at least three hours. Do not use the number moulded into the sidewall — that is the tire's maximum, not your target.

• Use the door-jamb sticker, not the sidewall number.
• Most cars/SUVs: 30–35 PSI (check your placard for the exact figure).
• The sidewall number is the MAX, not the recommended pressure.
• Check cold — before driving, or after the car has sat 3+ hours.
• Check monthly and before long trips.

Door Jamb vs Sidewall: Which Number Is Right?

The door-jamb placard is the one to use. It carries the pressure your vehicle was designed around, set by the people who built the car. The sidewall number is a property of the tire itself, the highest pressure it may safely hold, so matching it overinflates most cars and costs you ride comfort and grip.

Inflating to the sidewall max is the classic mistake: it overinflates most cars, giving a harsh ride and less grip.

Where do you find your recommended pressure?

Open the driver's door and look at the jamb or the B-pillar for a Tire and Loading Information placard. It lists the recommended cold PSI, sometimes a different figure front and rear. If the sticker is missing, the same number is in the glove box, the fuel-filler door, or the owner's manual.

Open the driver's door and look at the door jamb or the B-pillar (the post between the front and rear doors) for a "Tire and Loading Information" placard. It lists the recommended cold PSI, often a different number for front and rear. If it is not there, check the glove box, the fuel-filler door, or your owner's manual. Remember the value is a *cold* pressure.

How do you check and set tire pressure?

Check cold, read each tire with a gauge, then add or release air until it matches the placard figure. It takes about five minutes for all four. If you have just driven, the tires are warm and will read roughly 3 to 5 PSI high, so either wait or re-check once they have cooled.

1. Check cold. First thing in the morning, or after the car has sat at least 3 hours.
2. Find your target PSI on the door-jamb placard (note front vs rear if different).
3. Unscrew the valve cap and press a tire-pressure gauge firmly onto the valve.
4. Read the gauge. Compare to your target.
5. Add or release air to match. Add with an air pump; release by pressing the small pin in the valve.
6. Re-check, then replace the valve caps.
7. Don't forget the spare (if you have one).

Tip: If you just drove, your tires are warm and will read about 3–5 PSI high. Either check cold, or set them slightly above target to compensate and re-check cold later.

1. Why the Door-Jamb Number Wins

The manufacturer tested your exact vehicle with its tire size and weight to pick that pressure. It balances grip, braking, comfort, tread wear, and fuel economy. The sidewall max only tells you how much the tire *can* hold while carrying its maximum load.

Why it matters: The right pressure isn't a property of the tire alone, it's matched to your car. That's why the car's sticker, not the tire, has the answer.

2. What Underinflation Costs You

Low tires flex too much, wear out at the edges, run hot, use more fuel, and are more likely to fail at highway speed. Underinflation is the leading tire-related cause of trouble.

Why it matters: A few PSI low, ignored for months, quietly shortens tire life and raises your fuel bill, and can end in a blowout.

3. What Overinflation Costs You

Too much pressure makes the tire bulge in the middle, so only the center of the tread touches the road. You get a harsh ride, less grip, and center wear.

Why it matters: Overinflating to "be safe" actually reduces your grip and traction, the opposite of what you want.

4. Temperature Changes Your Pressure

Air pressure drops about 1 PSI for every 5°C the temperature falls. That is why your low-pressure warning light often appears on the first cold morning even though nothing is leaking. Topping up to the door-jamb spec resets it.

Why it matters: Knowing this saves a panicked trip: a cold-weather light usually just means "add a little air," not "something is broken."

How can PitStop & Go help?

If you are not sure of your correct pressure, or a low-pressure light will not go off, we will check and set all four tires and the spare to spec, look for slow leaks, and sort out TPMS sensor problems. Seven days a week in Fredericton, at flat rates.

Not sure of your correct pressure, or your low-pressure light won't go off? PitStop & Go will check and set all four tires (and your spare) to the manufacturer spec, inspect for slow leaks, and sort out any TPMS sensor issues, seven days a week in Fredericton, at flat rates with no upsells. If a valve or sensor is the real problem, we'll tell you straight and fix it.

<!-- OWNER: Run what the manufacturer says, not what's written on the tire. There's a sticker on the door jamb or inside the door with the right PSI for your vehicle. The only time that changes is if you're on an aftermarket wheel setup.

In winter the pressure drops on its own — cold air takes up less space — so you'll need to top up as it gets colder. That's where TPMS sensors earn their keep. They tell you before you're driving on a soft tire. -->

Key takeaways

• Use the door-jamb sticker pressure, not the sidewall max.
• Most cars and SUVs run 30–35 PSI; check your placard for the exact figure.
• Always check cold; tires read ~3–5 PSI high when warm.
• Under- and over-inflation both cost you grip, tread life, and fuel economy.
• Pressure falls ~1 PSI per 5°C, so a cold-weather warning light usually just needs air.

Frequently Asked Questions

What tire pressure should my tires be?

Set your tires to the pressure your vehicle manufacturer recommends, which is on a sticker in the driver's door jamb, not the number on the tire's sidewall. For most passenger cars and SUVs this is between 30 and 35 PSI. The sidewall number is the maximum the tire can hold, not the recommended pressure for your car, so always use the door-jamb figure.

Should I use the PSI on the door jamb or the tire sidewall?

Use the door-jamb sticker. That number is the pressure your vehicle's manufacturer chose for your specific car, tire size, and load, and it gives the best balance of grip, comfort, wear, and fuel economy. The sidewall shows the tire's maximum safe pressure (often 44 to 51 PSI), which is a limit, not a target. Inflating to the sidewall max makes the ride harsh and reduces grip.

Where do I find the recommended tire pressure for my car?

Open the driver's door and look at the door jamb or the B-pillar for a Tire and Loading Information placard. It lists the recommended cold PSI for the front and rear tires. If it is not there, check the glove box, the fuel-filler door, or your owner's manual. The value is a cold pressure, meaning before you have driven on the tires.

When should I check tire pressure, cold or warm?

Check tire pressure when the tires are cold, first thing in the morning or after the car has sat for at least three hours. Tires heat up as you drive and gain roughly 3 to 5 PSI, so checking warm gives a falsely high reading. The recommended pressure on the door jamb is always a cold number, so match it cold.

What happens if my tires are under or over inflated?

Underinflated tires wear on the edges, run hot, use more fuel, and are more likely to fail. Overinflated tires wear in the center, ride harshly, and have less grip because less of the tread touches the road. Correct pressure gives you the best grip, longest tread life, and best fuel economy, which is why it is worth checking monthly.

How often should I check my tire pressure?

Check your tire pressure about once a month and before long trips. Tires naturally lose a little air over time, and pressure also drops about 1 PSI for every 5 degrees Celsius the temperature falls, so a cold snap can set off your low-pressure light even if nothing is wrong. Topping up to the door-jamb spec fixes it.

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Low-pressure light on, or not sure of your numbers? PitStop & Go checks and sets your tire pressure, inspects for leaks, and fixes TPMS issues, seven days a week in Fredericton, no upsells. Book a Tire Check.

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