Maintaining proper tire inflation is relatively simple and essential to the overall tire performance of your vehicle. A properly inflated tire will provide longer life, quicker steering response, better fuel efficiency and a smoother ride than an improperly inflated tire. Both underinflation and overinflation can cause headaches like premature treadwear and possible tire failure. The best way to ensure you're getting the most out of your tires is to check your tire pressure on a monthly basis.
Knowing how to use a tire pressure gauge is very simple. Here’s how to check tire pressure and refill your tires.
Items You Need When Checking Tire Pressure
Tire pressure gauge
Air compressor
Pen and paper
Your tire pressure gauge can be digital or standard. Auto parts stores typically carry both. Many auto parts stores sell portable air compressors that run from your car battery or 12v power port. Alternatively, you can use the air compressor found at most gas stations. They usually cost $0.50 or $1.00 to use.
Vehicle manufacturers specify PSI – literally “pounds per square inch” of pressure – assuming tires are cold. Tires are considered cold when the vehicle has been parked for three hours or more, or if the vehicle has been driven less than a mile (1.6 km) at moderate speed. PSI is the unit your pressure gauge uses to provide readings.
Look on the driver’s side door jamb or your owner’s manual to find the recommended cold tire PSI for your front and rear tires. If you cannot find it, you should consult your vehicle dealer, manufacturer, or a qualified tire professional.
If your front and rear tires require different pressure levels, write down the correct PSI for each to avoid getting confused as you move around your vehicle checking tire pressure.
Remove the valve cap from one of your tires. Then place the pressure gauge on the valve stem and press down hard enough so the hiss sound disappears and your gauge provides a reading. With a standard gauge, the air pressure will push a small bar out from the bottom of the gauge. Measurement units are etched into the bar. A digital gauge will show you the reading on a screen.
Write down the reading and repeat this process for all four tires.
Use an air compressor to refill any tires with low pressure. Many air compressors are different, so read directions carefully to be sure you’re using it correctly.
If you’re using the air compressor at a gas station, be sure to park so that the hose will reach all four tires. Insert change into the machine until you hear the motor running. Fill each tire by placing the end of the hose over the valve stem and pressing on the lever.
Using a gas station air compressor means your tires might be “hot.
” If it is necessary to adjust inflation pressure when tires are “hot”, set their pressure to 4 psi (14 kPa) above the recommended cold inflation pressure. Recheck the inflation pressure when the tires are cold.
After filling your tires, use the gauge to check pressure again. At this point, it’s ok if you overfilled the tires because you can always let some air back out. Never drive on overinflated tires. Overinflation can result in decreased traction, premature wear, and decreased impact absorption.
Make the above procedure a monthly ritual. Regularly checking your tire pressure is the best way to ensure your tires never dip far below the optimal PSI.
Accuracy matters and you should keep that in mind when choosing a gauge. For just a few dollars, you can find a quality, accurate tire pressure gauge that gives accurate readings. If you’re not sure which one to purchase, ask a professional technician which he or she prefers.
A digital tire pressure gauge will provide accurate readings, but don’t forget that it operates on a battery. If you think having to replace the battery will prevent you from using it, it’s best to go with a standard gauge.
It’s best to use your personal tire gauge versus those available attached to air hoses at service stations. Of all the pressure gauges out there, they’re the most likely to be weathered, and possibly inaccurate.
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Make it a part of your monthly maintenance routine in a matter of minutes.Every editorial product is independently selected, though we may be compensated or receive an affiliate commission if you buy something through our links. Ratings and prices are accurate and items are in stock as of time of publication.
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Driving on improperly-inflated tires can wear out the tread and cause steering problems. That’s why it’s important to check your tire pressure regularly.
Fortunately, checking tire pressure only requires two tools — a tire pressure gauge and an air compressor. Most gas stations have an air compressor so you only need to own one tool. The whole process is relatively quick, too. In a matter of minutes you’ve done a lot to ensure a safe and smooth ride.
Before you begin, make sure the car has been parked for three to four hours so you get an accurate reading from the gauge. If you drive to a gas station to use an air compressor, try to find one less than a mile away.
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The driver’s side door jamb typically has a sticker with the recommended PSI (pounds per square inch) for the tires. Most manufacturers recommend 30 to 32 PSI for all four tires, although some cars will have different PSI recommendations for the front tires and back tires.
If you don’t see the recommended PSI on your door jamb, check your owner’s manual.
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Unscrew the cap on the tire air valve and place it somewhere safe.
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Press the gauge onto the tire air valve straight on, and press it hard. This creates a tight seal around the tire air valve so you don’t accidentally release air from the tire. You’ll hear a hissing sound if air is coming out. A small bar with numbered notches will pop out of the pencil gauge with the tire pressure reading.
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Fill up the tire by pressing the air compressor nozzle onto the tire air valve in the same manner as the gauge — hard and straight-on to create a tight seal.
Hold the nozzle onto the tire air valve for about 30 seconds to one minute, depending on how low the initial reading is. Repeat Step Three to get the new reading. Add or release air as needed to reach the recommended PSI.
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Repeat Steps Three and Four on the three remaining tires.
Originally Published: April 16, 2020
Veronica Graham
Veronica Graham is a freelance writer in Arlington, Mass. Her work has appeared in The Washington Post and SheKnows. She's covered health, politics, high school football and everything in between. Graham enjoys learning about the world through a variety of lenses as a reporter.
20.01.2022
Tires experience the greatest load in the car and constant contact with the road surface, which leads to their rapid tire wear.
To extend the life of the rubber and at the same time ensure the safety of movement by car will allow maintaining the optimal pressure in the wheels, which can change under the influence of various factors. That is why, the question of how often to check tire pressure and how to do it correctly worries many car owners.
Regardless of the tightness of the tires, their pressure is reduced by 0.7 bar every month, even under ideal conditions. Inadequate pressure to the level recommended by the manufacturer not only shortens the life of the rubber, but also has more negative consequences. An excess or deficiency of this indicator is the cause of:
This can be avoided by checking the pressure in the car's tires at least once a month. It is also recommended to check the pressure level before and after long trips. For each car, the manufacturer indicates its requirements for this indicator, which is indicated on a special plate located near the driver's door, on the fuel tank or elsewhere, depending on the brand of the car.
It is possible to determine the deviation of pressure from the normal level of this indicator, according to certain criteria. With insufficient pressure, the wheels begin to make a whistling sound during the entry into a turn, even at low speed, and when cornering at high speed, the flat tires “break down”. If the lack of pressure is observed only on one wheel, then the car begins to pull to the side.
Inflated tires tend to have a sharp response to vehicle handling and terrain features, even when driving in a straight line. The car shakes noticeably on bumps and the side edge of the tire is more pronounced when entering a turn.
In addition, with excessive pressure, the car rolls well on both flat and uneven surfaces.
The most common, convenient, and accurate method of measuring pressure is with a pressure gauge built into an air compressor. It can be found at service stations or specialized gas stations, or you can purchase a portable device for personal use at an auto shop. Depending on the version, there are three types of such equipment on the market:
In addition, there is an alternative to pressure gauges on the market - special electronic sensors made in the form of caps.
They constantly determine the level of pressure in the tire and allow you to control the degree of inflation without additional equipment. Sensors with a transparent upper part are installed on each nipple. Depending on the pressure indicator, the transparent part is painted in a certain color:
The most accurate solution is offered by the Tire Pressure Monitor System (TPMS), which is already installed on many modern cars in factory conveyor conditions. In this case, the electronics independently determines the change in tire pressure and notifies about it using the on-board computer. Today TPMS is represented by several types:
Based on these ratios, the system determines the pressure level and detects the problem, which alerts the driver, but without transmitting accurate data. The main mistake that car owners make is to measure the air pressure in the tires after a long trip or after the car has stood in the sun for a long time. To get up-to-date data, check the tire pressure when the tires are cold. The best time for this is the morning hours. If the car has driven several tens of kilometers or stood in the heat, the results will not be correct.
The level determination process itself is carried out as follows:
If the pressure level deviates up or down, it is necessary to correct this indicator by dropping or increasing the amount of air in the wheels and reinstalling the cap on the air valve.
This procedure must be carried out in each case for all four tires. With regular changes in pressure, it is necessary to have the wheels checked by a professional workshop.
Different units are used to measure pressure. In Russia, this indicator is determined in bars (bar) and atmospheres (kg / cm²). Both measurement options are used as synonyms, since they are almost identical to each other: 0.9869 atm=1 bar.
For foreign models, this parameter is determined by the ratio of pounds per square inch and is indicated by "psi", which differs from the bar value: 1 bar = 14.5 psi. Due to the difference in values and the need to calculate the rate using formulas, many manufacturers indicate the optimal pressure in several units at a time.
In other cases, you can use the standard table of unit ratios for the most common values:
| bar | 2 | 2.2 | 2.5 | 2.7 | 2.9 |
| psi | 29 | 32 | 36 | 39 | 42 |
Anyone, even a novice driver, knows that tire pressure directly depends on the ambient temperature. When it gets cold, it drops, and during hot weather, on the contrary, it rises. As practice shows, deviations from the norm are observed even if the temperature fluctuates between 7–9 degrees.
When using summer tires in the warm season, it is recommended to follow the manufacturer's recommendations, and when using it in autumn or winter, it is necessary to add about 0.
2 bar to these figures, since on average the wheel regularly bleeds air in the range from 0.07 to 0.14 bar.
It is better to inflate outdoors, and not in a warm garage, since in this case the data will be incorrect and when the car leaves the open area, the tire pressure level will be lower than that which was inflated in the heat. In the summer, before checking and pumping, you should make sure that the car was not standing under the rays of the scorching sun.
When pumping air into the wheels in the summer, it is better to under-pump a little. This is due to the fact that during the heat the roadway also heats up, which increases the contact patch with the surface and, as a result, friction. These factors provoke heating of the air in the wheel, its expansion and an increase in the atmosphere under the tire up to 15%. In winter, a different picture is observed. In severe frost, after the car has left a warm room, there is a sharp compression of the air, so it is better to increase the pressure in the tires of the car in winter.
Photo: Shutterstock
www.adv.rbc.ru
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Tires are the only vehicle element that is in constant contact with the road. One of the main indicators of their serviceability is pressure. It affects not only fuel efficiency, but also safety.
As a rule, car manufacturers recommend maintaining tire pressures between 2.0 and 2.8 bar. But in practice there are situations when it is necessary to deviate from this norm.
www.adv.rbc.ru
Tire pressure should be checked at least once a month, there are several ways to do this. We understand why it is so important to observe the optimal pressure indicator and what it affects.
In this story:
Tire pressure is the resistance with which air "presses" on the inner area of the rubber.
Properly inflated tires will last longer, give you better ride quality and improve your driving safety. If the pressure in the tires is too low or they are pumped over, then the car owner runs the risk of facing a number of problems: from buying new tires to the threat of an accident.
Properly inflated tires will last longer (Photo: Global Look Press)
Under-inflated tires are tires that are below the recommended pressure. In this case, the contact patch of rubber with the road increases, which leads to increased friction or rolling resistance. A worn out outer edge of the tread can visually give out such a problem.
Increased friction with the road can cause the tire to overheat, slip and even burst. In addition, low tire pressure leads:
When tires are over-inflated, that is, above the manufacturer's recommended rate, the contact patch decreases. As a result, the main friction with the road is taken over by the central part of the tire.
Excessive tire pressure leads to excessive sensitivity to road irregularities and the risk of tire damage, even destruction. Overinflated tires also cause the following:
For overinflated tyres:
Excessive tire pressure leads to excessive sensitivity to road irregularities and the risk of tire damage (Photo: Shutterstock)
For each car model, the manufacturer sets its own optimal tire pressure. This indicator depends on the mass of the car, the speed of operation, the number of passengers (partial or full boarding), as well as the load on the trunk [1].
The recommended tire pressure can be found in the vehicle owner's manual or on one of the plates/stickers in the passenger compartment. They can be:
Tire pressure is measured in several units. In Russia, they usually indicate in kg / cm 2 (or atmospheres) and bars (bar). These two indicators are almost equal, which is why they are often used as synonyms:
Foreign models often use pounds per square inch (pound per square inch), or psi:
For convenience, car manufacturers can indicate pressure in two units at once - bar and psi. Thus, the need to independently calculate according to the formulas disappears. Otherwise, you can do this in one of the online calculators or check the table of popular values.
| 2.0 bar | 2.1 bar | 2.2 bar | 2. 3 bar | 2.4 bar | 2.5 bar | 2.6 bar | 2.7 bar | 2.8 bar |
| 29psi | 30psi | 32 psi | 33 psi | 35 psi | 36 psi | 38 psi | 39psi | 41 psi |
Temperature has a significant effect on tire pressure: when it drops, the pressure in the wheels decreases with it. When the temperature drops by 10 °C, the tire deflates by an average of 0.07–0.14 bar or 1 to 2 psi [2].
Temperature has a significant effect on tire pressure (Photo: Shutterstock)
Summer tires typically use manufacturer's recommended readings. But in winter, it is advised to add about 0.2 bar to these figures [3].
Experts also recommend checking and correcting tire pressure at outside temperature. In the cold season, swapping is best done not in a warm garage, but on the street. In summer, before such a manipulation, you should make sure that some of the wheels of the car were not under the scorching sun, while others were in the shade.
Sometimes the tire pressure needs to be adjusted according to the situation. For example, when the machine is fully loaded or a trailer is towed. For such cases, automakers, as a rule, separately indicate the optimal pressure.
But there are moments that fall into the category of extreme and non-standard (especially if before that the car most often drove around the city). Automotive expert Tatyana Eliseeva analyzed the most common of them.
Causes tires to heat up, especially in summer, so you should follow the manufacturer's recommendations before such a trip.
We do not know what we will meet: patched road repairs or heavy rain. After all, for each of these situations, the recommendations will be opposite. Athletes can play with pressure when track conditions are known and engineers can always change the settings. For a long journey, the layman just needs to choose the average.
Tires must be bled off, especially on sand. The question is for how much? You can bleed up to 0.7 atm, but a not very experienced motorist can slip the wheels with an inaccurate movement, and if the driver turns the steering wheel sharply (for example, trying to catch on the edge of the track), then the tire can come off the disk. And such cases occur regularly.
At near-zero temperatures on packed snow, ice or sludge for new wheels (Velcro or studded) it is better to pump the wheels a little so that water and sludge are squeezed out of the central zone of the contact patch and the tread is better worked.
The wheel must be cleared for the tread to work. When it is clogged with snow, the braking distance and traction deteriorate greatly.
If the car has worn wheels, but with an acceptable tread depth for winter tires (4 mm), then you should not hope for the correct operation of the tread. Such a low checker no longer pushes the snow. In this case, it is necessary to reduce the pressure in the wheel, thereby increasing the same contact patch.
Photo: Global Look Press
On a country road, the weight of the machine will be an important factor. In this case, we select the pressure according to the load - specific indicators must be viewed on the central pillar of the body. There you will see something like the following recommendation: the more the car is loaded, the higher the pressure in the rear wheels should be.
But a heavily rutted road can lead to bulges, ruptures and tire damage. Therefore, if we increase the pressure, then we drive on a bad road as calmly and measuredly as possible.
Or we slightly deviate from the manufacturer's recommendations and raise the pressure not as much as the manufacturer recommends.
The main factor in changing the behavior of the wheel is not the pressure drop at altitude, but the presence of a large number of tight turns and long braking. The tire will heat up not only from the loads, but also from the operation of the brake mechanisms. Therefore, the idea that due to low pressure it is necessary to increase the pressure in the tires is wrong, because the temperature of the wheel has a much greater influence in this case.
The recommended pressure is always given when the tires are cold. This means that the vehicle has not been driven for three hours or has traveled less than 1 mile (or one mile).
There are two ways to check tire pressure: do it yourself or at a workshop. In the first case, it is enough to use a public pump at a gas station or purchase a pressure gauge.
This tire pressure measuring device comes in three types:
Another option is to install special pressure control caps on each nipple. Such a gadget works as follows: the upper part of the cap is transparent and, depending on the level of pressure, an indicator of three colors appears in it. Green - the pressure is normal, yellow - the tire is flat, red - the pressure has exceeded the norm.
Photo: Shutterstock
The easiest way to monitor tire pressure is with the automatic TPMS (Tire Pressure Monitor System). Today it is installed on almost all models, and in some countries its presence is a prerequisite for releasing a car from the assembly line.
In such systems, the electronics automatically detects changes in the tire, and if the pressure drops below the recommended value, a warning signal lights up on the on-board computer screen.
There are two types of TPMS:
Car manufacturers recommend checking tire pressure every two weeks, but at least once a month. Indeed, even under ideal conditions (for example, the car is idle for a long time), the wheels lose approximately 0.069bar, or 1 psi, per month [4].
Check the pressure before and after a long trip, during a sudden change in temperature (for example, during the first frost or warming), and also after changing tires or driving with a load.
Also, don't forget the spare wheel. Automakers advise servicing it at least as often as the main wheels.
