How to Check Tire Pressure and Wheel Alignment

Checking your tire pressure and wheel alignment regularly is one of the most effective ways to prevent uneven tire wear, extend tire life, and improve fuel efficiency. This guide walks you through both checks, what tools you need, and how to interpret the results so you can keep your tires wearing evenly.

What You’ll Need

• Tire pressure gauge (digital, dial, or pencil type)
• Air compressor or access to a gas station air pump
• Your vehicle’s recommended tire pressure (found in the owner’s manual or on a sticker inside the driver’s door jamb)
• Chalk or a piece of tape (optional, for a quick alignment check)
• A flat, level surface (for both checks)

Step-by-Step

Checking Tire Pressure

1. Check when tires are cold. Ideally, check pressure in the morning before driving, or at least three hours after the car has been parked. Driving heats up the tires and increases pressure, giving a false reading.
2. Find the recommended pressure. Look for a sticker on the driver’s side door jamb, inside the fuel door, or in the owner’s manual. It will list the front and rear pressures (usually in PSI or kPa). Do not use the number molded on the tire sidewall—that’s the maximum pressure, not the recommended one.
3. Remove the valve cap from the tire’s valve stem. Keep it in a safe place (like your pocket) so you don’t lose it.
4. Press the gauge firmly onto the valve stem. You should hear a hiss of air for a split second, then the gauge will give a reading. If you hear continuous hissing, reposition the gauge to get a tight seal.
5. Read the pressure on the gauge. Compare it to the recommended value. If it’s lower, add air; if higher, release some air.
6. Add air if needed. Attach the air hose from the compressor to the valve stem and add air in short bursts. Recheck with your gauge after each burst—don’t rely on the gauge on the air pump, as they can be inaccurate.
7. Release air if overinflated. Press the small pin in the center of the valve stem with the back of the gauge or a tool to let out a little air, then recheck.
8. Repeat for all four tires. Don’t forget the spare if your vehicle has one and it’s accessible.
9. Replace the valve caps and ensure they’re snug.

Checking Wheel Alignment

Wheel alignment is the adjustment of the angles of the wheels so they are perpendicular to the ground and parallel to each other. You can’t adjust it yourself without special equipment, but you can check for signs that alignment is off.

1. Park on a flat, level surface. Make sure the tires are pointing straight ahead.
2. Inspect the tread for uneven wear. Look at both edges and the center of each tire. If the inner or outer edge is worn significantly more than the middle, that’s a sign of alignment issues (camber). If one side of the car’s tires are worn more than the other, that could indicate a toe problem.
3. Do the chalk test (optional). Draw a straight line across the tread of each front tire using chalk. Drive the car straight for about 100 feet (30 meters) on a flat road. Then, inspect the chalk marks. If the lines are still visible across the entire width, the tire is rolling straight. If the chalk is worn off more on one edge, the tire is scrubbing, indicating an alignment issue.
4. Check for steering pull. On a safe, flat road, gently take your hands off the steering wheel for a few seconds. If the car drifts to one side, that’s a strong sign of misalignment.
5. Check the steering wheel position. When driving straight, the steering wheel should be centered. If it’s off to one side even when the car goes straight, the alignment is likely off.
6. Look for uneven tire wear patterns. If you see feathering (the tread blocks are worn on one side more than the other, creating a sharp edge), that’s a classic sign of toe misalignment.

Common Mistakes

• Checking pressure after driving. This gives a higher reading because the tires are hot. Always check when cold.
• Using the tire sidewall pressure. That’s the maximum pressure the tire can handle, not what your car needs.
• Ignoring the spare tire. A low spare will be useless in an emergency.
• Relying on the gas station gauge. These are often inaccurate. Use your own gauge.
• Assuming alignment is fine if the car doesn’t pull. Some alignment issues (like excessive toe) can cause wear without a noticeable pull.

Tips

• Check tire pressure at least once a month and before long trips.
• Invest in a good quality digital tire gauge—they are more accurate and easier to read.
• If you notice uneven wear, have your alignment checked by a professional. It’s a relatively inexpensive service that can save you from buying new tires prematurely.
• Rotate your tires every 5,000 to 8,000 miles (8,000 to 13,000 km) to promote even wear. This is especially important if you have a front-wheel-drive car, as the front tires wear faster.
• When adding air, do it in short bursts and recheck frequently to avoid overinflating.

Troubleshooting

• Pressure keeps dropping. This could be a slow leak from a nail, a damaged valve stem, or a poor seal between the tire and wheel. Inspect the tire for punctures and check the valve core. If you can’t find the cause, take the tire to a shop for a professional inspection.
• Your gauge gives different readings each time. Make sure you’re pressing it straight onto the valve stem and that it’s seated properly. If it still fluctuates, your gauge may be faulty—try a different one.
• You added air but the pressure didn’t increase. The air hose may not be making a good connection. Push the chuck firmly onto the valve stem and listen for a hiss. Also, check that the valve core isn’t loose.
• The car still pulls after you’ve checked pressure and tires look okay. This could be a brake issue, a tire with internal damage, or a suspension problem. Have a professional diagnose it.
• You see uneven wear but the car drives straight. Misalignment can be subtle. If you see any uneven wear, get the alignment checked—it’s better to be safe.

Frequently Asked Questions

How often should I check my tire pressure?

At least once a month and before any long trip. Tire pressure naturally decreases over time, and temperature changes can cause it to drop significantly.

What is the correct tire pressure for my car?

Check the sticker on the driver’s side door jamb, in the owner’s manual, or sometimes inside the fuel door. It will give the recommended PSI for the front and rear tires. Never use the max pressure printed on the tire sidewall.

Can I check alignment at home?

You can check for signs of misalignment (uneven wear, pulling, off-center steering wheel) but you cannot adjust the alignment yourself without specialized equipment. If you suspect an issue, take it to a professional.

How much does a wheel alignment cost?

Costs vary by location and shop, but a standard alignment typically ranges from $50 to $100. It’s a worthwhile investment to prevent premature tire wear.

What does uneven tire wear look like?

Look for wear on one edge more than the other, a feathered or scalloped pattern, or a smooth center with worn edges. Each pattern points to a different alignment or pressure issue.

Will low tire pressure cause uneven wear?

Yes. Low pressure causes the tire to flex more, leading to increased wear on the outer edges. Overinflation causes the center to wear faster. Maintaining proper pressure is key to even wear.

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