November 15, 2017

In recent years, tire shops are trying to popularize a new service - filling car tires with nitrogen instead of ordinary air. This topic has become overgrown with many tales and myths, as sellers endow "nitrogen" rays with fictitious advantages, and opponents put forward theories that have not been tested in practice. Why pump up the wheels with pure nitrogen and what real advantages the driver gets, read in this publication.

Gas injection technology

It is known from the school physics course that the ambient air already contains 78% nitrogen (meaning volume fractions). The remaining 22% is distributed between oxygen (almost 21%) and a good dozen different gases, whose share is about 1%. Also, water vapor is dissolved in the air, which is from 0.2 to 2.5% of the volume of gases. This value varies depending on the weather, season and latitude.

The essence of the technology is simple: extract 78% of the gas from the air and fill automobile cylinders. In practice, nitrogen is injected into tires as follows:

1. The wheel valve is connected by a hose to an automatic vacuum-nitrogen plant.
2. After switching on, the unit completely sucks the air mixture out of the tire.
3. After passing it through a system of special filters and a dryer, the plant produces nitrogen with a purity of at least 95%.
4. The purified gas is pumped into the wheel in compliance with the pressure required by the manufacturer.

Processing ordinary air, the nitrogen generator not only removes oxygen and other impurities, but also captures water vapor. This fact should be taken into account in further consideration of the issue in order to separate the real pros and cons of the procedure from myths.

Reference. The technical specialists who service the Formula 1 races and various rallies do not have such a question. The slopes of all fireballs are filled with nitrogen by default.

Real and fictional benefits

To begin with, it is worth listing all the advantages indicated on billboards near tire shops. What does the use of nitrogen in car cylinders give, according to the assurances of the sellers of the service:

• constant tire pressure regardless of ambient temperature and road surface;
• improved traction and slower tread wear;
• the movement of the car becomes softer;
• tires do not deflate over time;
• reduction of braking distance and improvement of accelerating dynamics;
• the likelihood of tire explosion under load is significantly reduced.

When the rubber is heated, the pressure does not increase

The effect of thermal expansion of air in tires is known to all drivers who rock the slopes on their own. The bottom line is this: when it gets warm outside, the gas in the cylinders expands and the pressure in the wheels increases by 0.2–0.5 bar. And vice versa, after the onset of cold weather, the slopes “sag”. Advertising claims: the coefficient of thermal expansion of nitrogen is 7 times less, so the tire pressure practically does not change.

Opponents of this theory rely on the laws of physics, according to which all gases expand in the same way. That is, the difference in pressure in the wheels, pumped up with nitrogen and air mixture, is negligible.

In practice, the situation is different: filling tires with nitrogen really allows you to keep the pressure at the same level, regardless of the temperature outside. Probably, the presence of water vapor in the air, which is absent in the nitrogen environment, plays a role here (remember - the gas is dried before injection).

Improving the performance properties of rubber

The grip of the working surface of the wheel with the road surface depends on many factors, including:

• rubber properties, product quality;
• shape, pattern and design of the tread;
• the size of the contact patch and the distribution of forces in it;
• type and condition of the road surface.

The type of gas pumped into the tire has no effect on grip and tread wear. You can artificially change the pressure in the slopes and in this way increase or decrease the contact patch, but the contents of the balloon do not matter. The statement is not true.

Soft car ride

Another answer to the question of why fill tires with nitrogen is as follows: a balloon filled with this gas is not as elastic as air. As a result, the wheel bounces less on bumps in the road, the ride becomes more comfortable, and the suspension lasts longer.

The argument is explained by the lower specific gravity of nitrogen compared to air, although in reality the difference is small. There is an interesting point here: the specific gravity of the air mixture is a variable value that depends on temperature and moisture content. If cold air is pumped at minus 20 ° C, then the weight of 1 m 3 is 1.396 kg, warm (+10 ° C) - 1.248 kg.

Practical observations have shown that the softening of the ride is felt when driving over small bumps on cars of a budget price category with a classic suspension. In business and premium cars, the improvement in comfort is not felt, since they use an effective multi-link suspension.

The ramps don't go down

The advertisement says that the nitrogen molecule is larger than a particle of air, so it does not "crawl" into the rubber microcracks that are inevitably formed as a result of operation on rough roads. Therefore, tires do not deflate for a long time and do not require pumping.

The statement belongs to the category of absurd. The difference between the particles of air and nitrogen is so tiny (0.02 nanometers) that in the event of a crack, the molecules of both gases will freely penetrate into it. What happens in practice: for the same period of time, the "air" wheel loses 0.5 bar, filled with nitrogen - 0.47 bar.

Improve driving performance and safety

When the tires are filled with nitrogen, acceleration dynamics improves and the braking distance of the car is shortened. This argument is a logical consequence of the untruthful statement about increased grip with the road surface. This means that in reality the acceleration and deceleration of the car remains unchanged, and the advantage is fictitious.

Riding safety is improved on the basis that "nitrogen" ramps explode less. There is some truth in such conclusions: tires burst from a heavy load and heating, which causes the air pressure in the cylinder to increase to critical. Nitrogen is more tolerant of temperature increase and does not give rise to pressure increase, so rubber explodes less often.

Obvious disadvantages

In general, inflating tires with nitrogen is beneficial. No wonder this gas is widely used in circuit racing and rallying. There are only two cons:

• decent price of the service;
• the impossibility of pumping and the loss of the nitrogen mixture in the event of a puncture of the wheel on the way.

Compared to ordinary air, the price of filling with nitrogen is 5-10 times higher, depending on the region. Knowing what are the real pros and cons of this procedure, you will make the right decision about using the service. She definitely won't do any harm.

Turning to a service station for a particular service, the driver may be faced with a situation of imposing additional services. When working with a car, it is beneficial for craftsmen to get the highest possible check, even if the driver wants to repair or replace a specific part. When contacting a service center to change summer tires to winter tires, the driver may be faced with a situation of imposing services.

Recently, drivers in tire shops are often offered to inflate their tires with nitrogen. This service appeared on the Russian market relatively recently, and drivers who have little understanding of the technical nuances of a car often agree to use it, as a result of which their check for “changing shoes” increases. In the article, we will consider whether there are advantages to injecting nitrogen into tires, or whether this service is nothing more than a marketing ploy.

Table of contents:

Nitrogen in tires: pros and cons

If you look at car forums, you can find conflicting opinions about whether it is necessary to pump nitrogen into winter or summer tires. Some drivers unequivocally say that this is necessary, others say that they do not feel the difference when operating rubber with nitrogen or ordinary air.

Among the main advantages that supporters of nitrogen cite are:

• Reducing the risk of an "explosion" of the wheel, since there is no oxygen in it;
• The wheel becomes lighter, resulting in lower fuel costs;
• Movement on wheels pumped with nitrogen is stable and does not depend on the heating of the tire;
• Even if such a wheel is punctured, you can still safely ride on it. Due to this, drivers can not worry about tire pressure and check it less often;
• The tire lasts much longer and does not rot.

As for drivers who are against nitrogen, most often they have only one argument regarding the effectiveness of the new technology. According to them, the difference between "pure" nitrogen and the air that is usually injected is minimal. There is some truth in this, if you look at the compositions.

As you know, the air that is pumped into the wheel, on average, consists of 78-80% nitrogen and 18-20% oxygen and about 1% carbon dioxide. The nitrogen that tire shops promise to pump into the wheels is about 95% nitrogen and 5% oxygen. As you can see, the difference in the percentage of nitrogen is not very high - about 15-20%.

Please note: All nitrogen and oxygen percentages given above are averages. For example, some services may use "nitrogen", which is 85-90% nitrogen and the rest oxygen.

It turns out that the driver should receive all the advantages indicated above at the expense of an additional 15-20% of nitrogen, while paying a fairly significant amount for it.

We will analyze each of the points that drivers put in plus the use of a high nitrogen content, separately.

Reducing the risk of "explosion" of the wheel

Due to the lack of oxygen, which is known to burn, drivers assume that a tire has a minimal chance of exploding if it is filled with nitrogen all the way. However, the fact is that tires themselves do not explode. So it is customary to say, but in fact no explosion occurs in them.

Please note: We are talking about the operation of the car in normal conditions. For example, when drifting, due to overheating of the wheels, they can really explode.

When they talk about the explosion of a wheel, most often they mean that they burst, but here the fact of the presence of oxygen does not affect in any way. The fact that nitrogen is pumped inside can prevent the tire from igniting after it bursts, but on city cars, burst tires usually do not ignite (with rare exceptions).

Bottom line: Reducing the risk of a wheel explosion and fire is not something that would attract drivers in normal city driving in normal conditions to nitrogen.

Nitrogen wheel lighter

Fuel is something that drivers always want to save money on, whether they use a gasoline or diesel engine. The prospect of spending 500-1000 rubles for pumping nitrogen into tires, in order to “recapture” several thousand rubles for the season, thanks to the reduced weight of tires, can attract drivers.

But in order to estimate the savings, it is better to look at the actual weight of air and nitrogen, and then subtract the difference and determine the savings. The mass of a cubic meter of air is approximately 1.29 kg, and the mass of pure nitrogen (note that it is pure) is approximately 1.25 kg. One wheel with a diameter of 14-15 holds about 0.0774 kg of clean air or 0.075 kg of nitrogen. Accordingly, with 4 wheels, the savings when pumping nitrogen instead of air by weight comes out to be about 10 grams.

Bottom line: 10 grams in the total weight of the car is the equivalent of the word "nothing". Adhering dirt weighs much more. Accordingly, filling tires with nitrogen will not save on fuel.

Movement stability

Every driver knows that in the cold season, when a car is moving from a parking lot, its “behavior” will be very different from how it will behave when the engine and tires are warm. This is due to the fact that when the tires rub against the asphalt, they heat up, as a result of which the pressure changes.

In workshops where they offer to pump nitrogen into tires, experts say that the pressure will always be constant, due to the absence of oxygen. According to them, this will allow the car to always behave the same way.

But if we turn to the laws of physics, namely, to Charles's law and Gay-Lussac's law, we can conclude that the gas pressure in the tire will increase in any case during heating.

Bottom line: It makes no difference whether you use air or nitrogen, the pressure will "jump" in any case.

Can't check tire pressure

Please note: Before starting the discussion of this item, we will give a recommendation - be sure to check the tire pressure before the trip, especially in winter.

Drivers who don't want to check their tire pressure may decide to pay to have nitrogen injected into their tires to give them peace of mind. However, this point is not entirely correct. If we turn to the physics of the process, most often the pressure is released through microcracks.

Oxygen molecules have a size of 0.000000029 cm, and nitrogen molecules are 0.000000031 cm. As you can see, the difference is not very significant. Accordingly, if tires are inflated with nitrogen, then the probability of pressure bleeding through microcracks will not decrease much. In addition, modern tubeless tires can hold pressure for years if there are no serious “holes”. Even with a tire puncture, the driver has the opportunity to get to the car service.

Bottom line: This advantage is nothing more than a "fairy tale for the lazy" who do not want to check tire pressure all the time.

Long tire life and reduced disc corrosion

Perhaps one of the points that can really be substantiated. Supporters of nitrogen claim that when it is used instead of air, the disk does not rust inside, and the rubber itself is consumed less actively. Since oxygen is one of the main catalysts for oxidation, there is less chance of rust inside the wheel if it is not present. However, this plus is doubtful, since outside the wheel is still exposed to oxygen and even more aggressive environments - dirt, snow, rain, dust, and so on.

Please note: Modern discs take a very long time to age because they are made of aluminum and magnesium alloy.

The idea came from motorsport: the tires of Formula 1 cars are really filled with nitrogen. Usually, in the event of an accident with a car fire, a burst tire provides oxygen pressurization, similar to how air is pumped into a forge to raise the temperature. But tires inflated with nitrogen, under the same conditions, do not "add fuel to the fire."

But that's in sports. And “in civilian life” we see fires during a car accident much less often. After all, designers have worked hard to reduce the fire hazard in an accident.

Issue price

Arriving at the tire shop and succumbing to the persuasion of refueling tires with nitrogen, you will see that air is first pumped out of your car tires, and then they are filled with nitrogen from a special installation. installed in accordance with the specifications of the vehicle manufacturer. Such a procedure will cost from 180 to 260 rubles per wheel. The larger the diameter, the more expensive.

Advertising move

At a branded expensive tire fitting, almost any car owner, and especially the owner, will probably be offered. There are many arguments in favor of this procedure. Let's figure out which of them are true and which are fiction:

1. The tire pressure will be stable because the nitrogen hardly expands from heat. But the air is already 78% nitrogen, so the changes are due to the rest of the gases, which also do not expand beyond measure. The difference in the coefficient of volumetric expansion is negligible with a significant figure in the fourth decimal place.
2. Nitrogen molecules are larger and therefore do not so quickly penetrate the tire walls to the outside, keeping the pressure stable. But do not forget that there is not so much oxygen with other gases - about 22%. And when they begin to evaporate, and we start pumping up the tire, the nitrogen concentration will increase. So, in a 5-6-year-old wheel, an almost purely nitrogen "atmosphere" is formed inside.
3. A wheel filled with nitrogen is lighter than a wheel filled with atmospheric air. This allows . Simple calculations show that the wheel of a mid-size crossover will feel lighter by only a few grams. And how much do the stones stuck in the tread weigh? Let's better clean the tread more often, especially since tire design engineers highly recommend this.
4. The absence of oxygen protects the tire material from premature aging. Tire workers support this thesis, but you don’t expect that your tires after a century will be placed on a pedestal, like the wheels of Lenin’s armored car. Wear and aging of the outer layers of rubber under the influence of the sun, ozone, moisture occurs much faster.
5. Better grip and greater safety due to stable performance. I disagree: it is still necessary to check the pressure in the tires periodically, and with each “zilch” precious nitrogen will come out. And you don't let yourself down. So servicemen strive to tie a car enthusiast to their workshop even for such an insignificant problem as checking pressure and pumping a wheel.

Real Alternative

It is difficult to save money on "nitrogen" tires, but there are more effective methods. And both free and very expensive:

• Timely seasonal tire replacement that meets both the requirements of the law and common sense. Summer tires definitely roll easier!
• Before long trips on the highway at 0.2 bar. It will be a little tougher, but noticeably more economical.

• Use light rims, and not just any alloy wheels, but preferably forged ones, they often have a significantly lower mass. And in general, not in design, but in weight. But to make sure that lightness is not at the expense of strength, look for certified rims.

• Use tires made using Energy saver technology. Many manufacturers have these today. They have a slightly lower rolling resistance due to the use of technologies tailored specifically for resource saving.
• Select tires using the results where each applicant is measured, including rolling resistance.
• Install alloy (and really light) wheels with a larger diameter and use the tire calculator to select the appropriate tires, while maintaining the outer diameter of the old wheel. Well, or a little more.
• You drive a lot on the highway, but with a small load, or the gears in your car's gearbox can be called "short", like, for example, Renault Logan or Lada Largus. That is, at 100 km / h, the engine makes more than 3000 rpm in top gear. Then Tires with a slightly larger diameter can be installed. This will make all gears slightly "longer" and save fuel.

In addition to the usual way of filling tires with air, car owners have recently been offered a service - tire inflation with nitrogen. There are both supporters of innovation and ardent opponents. To form your own opinion, it is worth comparing all the pros and cons, carefully checking the truth of the statements of a promising advertising policy.

Inflating Tires with Nitrogen - Benefits

Let's try to figure out what gives tire inflation with nitrogen, what benefits the owner of the vehicle receives in this case.

• Increasing the level of safety due to the difference in the coefficient of thermal expansion of nitrogen and oxygen molecules. Tires do not heat up when driving for a long time.
• Stable pressure regardless of ambient temperature.
• The slower leakage of nitrogen from a tire compared to oxygen is due to the enlarged diameter of the molecules.
• The low chemical activity of the nitrogen filling significantly extends the life of the rubber.
• Reduced wheel weight due to the lower molecular weight of nitrogen.
• The internal volume of the tire does not accumulate moisture, which is usually concentrated from the air mixture.

How is nitrogen injected into tires

The process of filling tires with nitrogen is carried out using a special device. The nitrogen generator is supplied with ordinary air at a pressure of 8 atmospheres. Before reaching its destination, it goes through several stages of filtration to remove solid particles, oils, water vapor, carbon oxides. At the outlet, the nitrogen concentration reaches 95%. The remaining 5% is mainly oxygen. The preparatory procedure takes quite a long time.

Racing car tires are inflated in several stages.

• Air release.
• Drying the internal volume naturally for several hours.
• Filling with nitrogen mixture from the generator. It is recommended to wait some time for the temperature to equalize.
• Final adjustment to the desired pressure.

It is unlikely that the service station provides for compliance with the entire cycle of actions.

Is there an effect of nitrogen in tires

At first glance, it may seem that nitrogen pumping makes sense. But as soon as you dig a little deeper, the question immediately arises: “Why, in fact, overpay for a non-existent benefit?”.

For reference. The price of the service exceeds the cost of filling with air by about 20 times.

According to the reviews of motorists, a comfortable ride can be achieved if the tire pressure is reduced by 0.2 atmospheres, regardless of their contents.

Nitrogen filling pressure stability at different temperatures does exist, but compared to air, the difference is so minimal that it cannot be fixed with a conventional pressure gauge.

The difference in the atomic weights of oxygen and nitrogen is insignificant, so talking about a significant reduction in the load on the suspension is generally ridiculous.

Another myth - fuel economy, is also associated with a lower mass of nitrogen. Nevertheless, for these purposes it is better to look for other ways, and not rely on an ephemeral effect.

If we talk about the regularity of pumping wheels, then the terms practically do not change. For a year, a tire loses up to 0.8 atmospheres. With nitrogen, this figure will be only slightly less. Any tire deflates, and this, alas, is a natural process.

The internal filling has practically no effect on the duration of the tire. External factors pose a great danger.

If we analyze the information sensibly, then the conclusion suggests itself that inflating tires with nitrogen is a purely publicity stunt aimed at increasing the personal income of service station owners. Such a service does not give special advantages to the car.

Sale of summer tires in Krasnodar at wholesale prices.

Relatively recently, car services began to offer Russian motorists such a service as inflating tires with nitrogen. Someone does this all the time, and someone, being wary of everything new, is in no hurry to apply nitrogen to their car. But for sure every driver has a lot of questions, the answers to which we will try to give today. In particular, we will tell you why you need to pump tires with nitrogen, is there any benefit from it, or is it just an invention of marketers, and, of course, we will figure out what air or nitrogen is better in tires, the pros and cons of the latter. And also we will give the existing myths and try to confirm or refute them.

The use of nitrogen to inflate tires is popular in the US and Europe, where the method is used on "commercial" vehicles - freight and passenger transport. Note that there are no standards for the mandatory use of nitrogen in none of the countries. Carriers independently decide how to inflate tires: with nitrogen or ordinary air.

Nitrogen inflation of racing car wheels

But if you look into history, you can find out that initially only racing cars and aircraft chassis were filled with nitrogen. Active use of nitrogen for Formula 1 cars suggests that this procedure is fully justified. But still, before you fill the tires of your car with an air mixture, you need to figure out why they fill the tires with nitrogen.

By the way, there is no consensus on the advisability of using nitrogen for tires among drivers and specialists. Suppliers of special equipment (nitrogen gas generator) and employees of car services where this service is offered, of course, vividly describe all the advantages of this technology. At the same time, many experts note that such a service is just one of the ways to pump money out of the wallets of gullible car owners. Let's see which of these opinions is correct.

Technology used

From the school curriculum, we know that air consists of oxygen, carbon, various impurities and nitrogen. And the last most of the air is almost 80%.

Wheel inflation

So, pump the wheels using a gas generator. A special unit helps to obtain a composition that is 95% nitrogen. Before pumping the air mixture into the tires, air is forced into the device. Further, the air mixture is filtered, which is carried out in several stages, the existing impurities, as well as excess moisture, are expelled from the air entering the gas generator. The purified air mixture enters special filters, where nitrogen is retained. The result is a purified, impurity-free mixture of nitrogen.

By the way, the price of this service for one wheel of a passenger car is about 200 rubles, as for trucks, it increases to five hundred rubles for one tire.

The opinion of sellers and marketers

According to supporters of pumping nitrogen into tires, this manipulation provides a lot of advantages. But it is worth putting these assurances to some doubt, for this you need to remember the school curriculum and try to understand whether there is a difference in the air and nitrogen mixture. Next, we list the advantages that a car owner receives when using a nitrogenous mixture instead of ordinary air. These are the arguments that drivers hear when visiting a car service for pumping wheels.

gas generator

1. The internal parts of the wheels, made of metal, are isolated from the corrosive processes that occur when oxygen is used.
2. During the movement, the car behaves more calmly and maintains maximum stability on the road.
3. In the operation of the wheels, with increasing loads or temperatures, there are noticeable improvements.
4. It becomes easier for the driver to control his car.
5. When the tires come into contact with the road surface, the driver feels less vibration and hears almost no noise.
6. When entering a corner or driving on the side of the road, the car becomes more stable.
7. If an extreme start is necessary, the least slippage is noted.
8. Tire pressure will not depend on temperature, load or speed.
9. Even when driving on rough roads, the machine will experience stable smoothness.
10. Uniform and long tire wear.
11. When hitting a curb, you will never damage the rims.
12. The length of the braking distance is reduced.
13. The load on the suspension will decrease, which will entail a significant reduction in overloads.
14. Wheel damping will be significantly improved.
15. In the event of overheating or damage, the likelihood of tire fire is reduced.
16. Tire life is increasing.
17. Driving safety is greatly increased.
18. The regularity of pumping wheels is greatly increased over time.
19. Vehicle maneuverability is improved.
20. The pressure in the tires is kept at a stable level.

What to put on wheels?

After such assurances, there is a desire to immediately fill the wheels of your car with this miraculous air mixture. However, you should not rush. Now we will try to figure out if this is how it all works out in reality.

Nitrogen pumping: fiction and reality

Increased driving comfort

Some of the above arguments can be combined into one statement: a car whose wheels are filled with a nitrogen mixture is much more comfortable to drive. This is not entirely true. For more softness while moving it is enough to reduce the volume of the injected mixture by only 0.2 atmospheres.

Load reduction

Marketers and tire workers say that pumping nitrogen into tires reduces stress on car suspensions. It is a myth! Again, referring to a chemistry textbook, you can find out that the molecular weight of nitrogen is only 7% less than the molecular weight of air. How do you think it affects such a slight difference in the total weight of the car? We can say without hesitation that it is not essential! The weight of gas in tires is a negligible part of the mass of the vehicle as a whole.

Nitrogen pumping

Increased driving safety

Nitrogen in tires improves driving safety. This is not true again. In fact, the wheels in racing cars are filled with nitrogen. It's done to reduce the possible consequences in the event of a possible ignition of a car. Nitrogen is an element that does not burn. In a traffic accident, it helps to reduce the strength of the flame. "Professionals" say that tires filled with nitrogen mixture will never explode. But imagine if the wheel breaks, then it makes absolutely no difference what was pumped into it.

Reducing the regularity of pumping wheels

"Sellers of air" claims that car wheels filled with nitrogen do not go down for a longer time. And again, referring to school knowledge, we can recall that the nitrogen molecule is much larger than the air molecule. But be aware that any wheel descends naturally! For a year, the pressure indicator in the wheels filled with air drops by approximately 0.8 atmospheres. Most likely, nitrogen will “leave” a little less. Although, if you think sensibly, then this difference will not be so significant and noticeable.

Wheel inflation frequency

Reduced fuel consumption

The most basic advertising technique: pumping tires with a nitrogen mixture reduces fuel consumption, since the inert gas is somewhat less in mass than oxygen. We talked about molecular weight a little earlier. Therefore, we declare with confidence that this argument is also a myth!

To really save fuel, there are other, much more efficient ways.

Tire pressure stabilization

Nitrogen, compared to air, lower volumetric expansion than air. Therefore, inflating tires with nitrogen helps to achieve a stable pressure in the wheels: nitrogen does not expand under the influence of high temperatures and does not shrink at negative temperatures outside.

According to Gay-Lussac's law, this indicator is equal for any gases. The algorithm of behavior of nitrogen and ordinary air with temperature changes does not differ at all. Speaking in terms of numbers, the difference in this figure is only 0.0001 (0.00025 atmospheres), and no device that measures tire pressure will record this difference.

Optimal tire pressure

No corrosive processes

The air contains natural moisture, which contributes to the formation of corrosion that destroys the cord coating of tires. This means that the use of nitrogen eliminates corrosion, and the working life of tires increases.

On closer examination of this issue, it becomes clear that Corrosion processes do not become the main cause of destruction of tires. Natural abrasion, deformation, cracking - all these processes happen more on the outside of the tire. As you can see, the tire earlier comes into disrepair from the outside.

And even tires that are ideal inside, which have a worn tread or cracks on it, cannot be used!

Better wheel grip

Nitrogen does not have the property of expanding and contracting under the influence of ambient temperature, and therefore part of the contact of the tire with the roadway remains stable.

This statement is absolute absurdity, given the lack of difference in gas expansion coefficients (see above). And it has a beneficial effect on the quality of adhesion of the wheels to the road, first of all, the tread pattern, the design features of the tire, the optimal distribution of the load on the wheels of the car, and so on.

Intraorbital pressure measurement

Conclusion

Pumping nitrogen into tires should only be weighing all the positives and negatives this procedure. In practice, the use of nitrogen is a very profitable business, since profits are obtained literally from thin air. Of course, you can personally test the effect of swapping, comparing it with existing experience and not delving into theoretical explanations. We only want to note that there will be no harm from this procedure, but significant changes should not be expected.

Finally, it must be clarified that nitrogen injection of car tires for passenger cars doesn't make much sense. In fact, the car owner will see absolutely no difference. On commercial vehicles, especially on special vehicles - fuel trucks and other vehicles, the use of nitrogen makes much more sense. In this option, the costs for the use of a nitrogenous mixture are passed on to the carrier company, and an insignificant increase in safety is achieved in some conditions. Although, the difference in this case will be insignificant in real conditions.

Car wheel

Well, and of course, the motorist himself will make the decision!