Is 40 Psi Good Tire Pressure? Explanation For Beginner

Ensuring safety when participating in driving is extremely important that any driver needs to pay attention to. Besides the control skills, road conditions, the specifications on the dashboard are also factors that cannot be ignored.

Tire pressure is a prime example. So, Is 40 psi good tire pressure?

According to experts, 40 psi is the perfect number to balance the vehicle's weight through research. Of course, pickups or SUVs often need a more significant number, but the difference is insignificant.

Besides the measurement of wheel tension, what are the relevant factors that we need to pay attention to? This article will help you answer the question.
Let’s dive into this article to get it clear!

Is 40 Psi Good Tire Pressure?


40 PSI for Car wheel

Through test surveys, automakers have given specific numbers that vary but generally range from 32 psi to 40 psi.

Most tires with 4 car seats or more such as Sedan, Hatchback, MPV or small 2-seater pickup trucks are at a standard level of 27 - 32 psi. Some models with special tires can have tire pressures up to 40 psi.

For 7-seat SUVs or large pickups, the standard pressure can be higher than 4 - 8 psi and can reach 45 psi.

Therefore, the answer depends on the type of car you own. And you can often see them in the stickers on the page of manuals, or you can hear them from consultants.

There is a lot of information from different newspapers. You should be sure to control the tires to the ideal pressure, and it will help ensure safety on long trips.

In addition, recommendations have also been to minimize unnecessary risks such as: setting up tire maintenance in a state of average temperature, regularly checking wheel pressure.

Check Tire Pressure

When you understand the problem, the maintenance of the wheel also becomes more accessible with the necessary tools in the job such as air compressor, tension gauge, note items. Here we will show you how to check tire pressure.

1. Test with cold tires

When the wheel is cold, it can be that the friction temperature in contact with the road surface would reduce when the tire is resting. Minimum downtime is 3 hours, or moderate driving speed does not exceed 2 kilometers.

In this so-called cold wheel condition, we can capture and measure the most accurate numbers available using gas measuring tools.

2. Check with meter


In this test, the operations are purely as follows:

First, unscrew the tire's valve cap, then quickly press the pressure gauge into the valve mouth and press it once until no squeaking sound is heard. The results of the measurements also gradually appear on the machine board.

3. Record specific parameters

Recording the PSI is also an essential step because the parameters between the front and rear wheels are completely different.

You should carefully record the tension measured at each wheel and compare them with the PSIs recommended by the car manufacturers.

4. Fill your tires with ideal PSI


The next step is to fill your tires with an ideal PSI. The required tool is an air compressor used to inflate the air. You should consider two ways: Buy an air compressor at an auto parts store or use the compressor at a gas station.

A safe way to let the pressurized wheel cool for about half an hour so the manipulation will be easier and more correct.

When using the compressor at a gas station, steer the vehicle to a convenient position so that the pump nozzle is in complete contact with all four wheels.

The next thing to do is press and place the gas pump to fill the tires from the valve mouth.

If you have to fill up with air while the wheel is still hot, one piece of advice is to inflate the air to 3-4 psi higher than the standard. And check again after the time the wheel has cooled down.

After completing the inflating steps, you should use a test meter to be more sure. Do not worry! Because the airflow will also lose a little to the outside in the journey of moving.

5. Check again


A tire pressure check is a final process used to finish the job, which is considered a step to check all parameters and tire valves to make sure it meets the requirements set out right from the start.

To get more methods, watch this video right now!

Video created by GeoBeats Science

What Happens If The Tire Pressure Is Too High?

According to the announcements issued by NHTSA, vehicles with low or high tension will increase the risk of a traffic accident for the driver by 300%. In some instances, experts have pointed out the severe effects stemming from the air:

Affects traction: If the tire pressure is too high, it will reduce the traction of the tire, reduce the braking efficiency, make the car more shocked, affect the operation of the vehicle, causes uneven tire wear, but only focus on the middle part of the tire.

In addition, having too high a pressure causes Hydroplaning, a hazardous situation that causes loss of traction, making the front of the vehicle unable to control the execution of commands.

Affects the wheel's durability: When the tire pressure is too high, the tire will not control all the vibrations from the road surface. 

Besides, when slightly stretched tires, the middle part of the wheel will float up to make maximum contact with the road surface, causing rapid deterioration and wear down the middle of the wheel.

How To Maintain Proper Tire Pressure?

Maintaining tire pressure and tire maintenance is always necessary to keep an overall vehicle intact. The best way is to regularly monitor the available tire pressure, especially after driving long distances or carrying heavy loads.

Some people think monitoring tension only when the TPMS light is red is not recommended. Although it is a pressure monitoring system, TPMS only:

  • Turn on the light when the wheel is not fully discharged
  • No warning of steam feature
  • Can't warn when the wheel drops gas
  • Cannot detect inflating in progress
  • Unable to start if the TPMS is not available for the controller.

To prevent tire failure, you should assess the TPMS alert as soon as possible. In this case, TPMS tools will be your assistant to diagnose and fix the defective problems of your vehicle.

When does the tire pressure change?

In general, weather and climate greatly affect tire pressure. For example, in the summer under hot weather, tire pressure will increase due to the expansion of air and vice versa, in the winter under cold weather, the air inside the tire will contract, then the pressure in the tire is reduced.

To accurately measure tire pressure, do not measure immediately when the vehicle has just stopped. Instead, wait for the tire to cool down as recommended by the manufacturer.


This article gives you information about measurements, maintenance methods, and ways to check wheel pressure.

Hopefully, you can feel more secure in using your car through this content. Do not hesitate to share information with your loved ones because they are also looking for information. Thank you for reading!

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