How many atmospheres do you need to pump a bicycle wheel

Low tire pressure

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Lowered only to the floor of the atmosphere, the wheels change the behavior of the car and become unusable much earlier than the deadline. Under reduced pressure, the load on the tire surface is unevenly distributed. In this case, the lateral sides of the tire are exposed to increased wear at the point of contact of the tire with the road.

The sides of the flat tires are softer, and when you turn the steering wheel, they are crushed. The trajectory of the disc and the tire does not match, so the car reacts to the steering wheel with a delay.

over, if the pressure in the tires is lowered, then the wheel can be completely disassembled at a sharp turn. Therefore, it is very important to regularly check the tire pressure and maintain it within the norm.

This is especially true in the winter period, since in the cold, tire pressure can easily drop by 0.3 (or even 0.5) atmospheres.

It should also be borne in mind that low air pressure in the wheels leads to increased fuel consumption. Just in case, we remind you that our site has an excellent selection of tips on how to reduce fuel consumption on a car. be sure to read, for sure, you will find something new for yourself.

Increased tire pressure

With increased tire pressure, the load at the points of contact of the wheel with the road acts to a greater extent on the central part of the tire tread, thereby causing uneven tire wear.

On over-pumped wheels, the car slows down worse! This is because if the tires are pumped, then the contact patch with the road decreases, which means that the friction force that keeps the car from slipping decreases. In this case, the braking distance is noticeably increased.

In just twenty minutes of driving, while cornering as aggressively as possible, the tire pressure of a car can increase by 0.5 atmospheres. And on long trips at high speed, the pressure in the tires can even increase up to 4-5 atmospheres. And modern tires are designed for this.

But if the tire has a hernia or a cut, then it can get hot and explode on the go. And on the road it’s a disaster.

What should be the pressure in the tires?

The tire pressure of the vehicle should be checked at least once a week. Modern tubeless tires are very sensitive to pressure, so a decrease or increase in a tire by only 15-20% can increase its wear by up to 30% and negatively affect driving safety. Pits, speed bumps, curbs. from driving through them tire pressure drops.

We will tell you about what pressure should be in the tires of a car in winter and summer, and how its change affects the behavior of the car on the road and the wear of the tire tread.

Below in the text you will find tables of tire pressure of cars by brands and sizes of wheels, in which the most popular car models in Russia are presented.

And it will be much easier for you to deal with all kinds of markings on the wheels, having at hand the decoding of tire markings (designation indices, speed, tire load, etc.).

Optimal car tire pressure

The main task of car tires is to provide effective traction of the car with the road. Under normal tire pressure, the load in the contact patch of the wheel with the road is evenly distributed, due to which tire wear occurs evenly, the car is well controlled and fuel consumption is within normal limits.

There are three possible ways in which the tire pressure will not be optimal:

  • Increased pressure (tires are inflated);
  • Low pressure (tires under-inflated);
  • Different pressure in all wheels.

Check the tire pressure with a special tire pressure gauge. This should be done only on cold tires, that is, before leaving the parking lot or garage.

If deviations from the pressure in any of the tires are found (see the table below, what pressure should be in the tires of your car), such a wheel must either be pumped up or excess air must be released from it. that is, it is necessary to bring the pressure to the norm. In one of our articles, we have already talked about which car compressor is better for inflating tires.

It is worth noting that the tire pressure in winter should be exactly the same as in summer. But due to the sharp temperature drop, in the winter period of time, the control of air pressure in the wheels must be approached more responsibly.

It is better to inflate the wheels on the street. Also, do not forget to check the tire pressure in case of significant changes in the ambient temperature, and, if necessary, correct it:

  • if it gets colder outside, the pressure in the tires will decrease,
  • and when it gets warmer, it will rise.
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It should also be remembered that when the car is moving, the tires heat up, the air in them expands, and the pressure rises, and the handling and braking properties change.

Different tire pressures

The most common situation among drivers is when the pressure on all wheels is different. There can be many reasons, for example:

  • Defective spools;
  • Uneven tire wear;
  • Or perhaps the wheel has caught a nail.

In case of emergency braking, in this case, the coefficient of adhesion to the road for inflated and lowered wheels will be different, which with a high degree of probability will lead to a skid or a turn of the car across the road.

If the car even starts to drive to the side a little, there is a reason to check how the wheels are inflated. And remember that there are no eternal tires. Even very good rubber needs care.

Tire pressure tables by car make and wheel size

So let’s summarize

When riding a mountain bike in the city and a rolled primer, this is 3-3.5 atmospheres. For movement on the ground. 2.5-3 atmospheres

At the same time, if your weight is more than 80-100 kg, feel free to add another 0.5 atmosphere to the wheels (watch out so as not to go beyond the maximum pressure).

If you have a road bike. feel free to pump up 3.5-4 atmospheres, looking at the limit values ​​indicated on the tire.

The general principle is that the narrower the tire width, the higher the pressure in the wheel.

How to Pump a Mountain Bike Bicycle Tire With Presta Valve

Another point from the experience of cyclists. If you are using anti-puncture tape to protect the tube from punctures, try to maintain a slightly higher pressure in the wheel. Everything is simple here: the higher the pressure, the tighter the tape lies between the camera and the tire, does not “fidget” and does not move during sudden braking and cornering, and better performs its function.

Remember, you can find the optimal pressure for yourself only after cycling for a while. Each cyclist has a different weight and riding style. In this case, the same pressure for one will be optimal, and for someone too low or high.

Pressure effect

In fact, the optimal pressure in the tires of a bicycle is a purely individual parameter, which each biker varies within certain limits for himself: for his riding style, for the planned route and the current level of training. The limits are set by technological constraints, which we will consider further.

Here are the main factors to consider when choosing an inflation level:

  • high pressure gives “roll-over”. rolling speed, saving the strength of the cyclist;
  • excessively high, in turn, can provoke a breakdown of the chamber against the rim from the inside;
  • similarly, low pressure leads to “snake bites” when a rim on an obstacle or bump pierces the chamber at two points at once and reaches the tire;
  • low pressure prevents damage to mechanisms on numerous bumps;
  • at low pressure better “grip” and easier to move on rough terrain.

Taking into account all the pros and cons, a single recommendation can be made: the wheels should be inflated enough to provide good traction and not damage the camera. For this, there are standards for what pressure is considered acceptable. We will consider them further.

What to pump up

Bicycle luggage requires maintenance and pumping very often. Even on the most “hardy” city and mountain bikes, it is required to check and pump up the camera every 2-3 weeks, since the air leaks not only through the nipple, but also simply through the rubber. High pressure “helps” air molecules find their way through an insufficiently dense chamber.

“City”, or, simply, budget bikes, it is enough to pump up once every 2-4 weeks, mountain bikes. at least once every two weeks, road bikes. once a week, and road and sports bikes. before each trip.

Therefore, the pump is not only an emergency accessory that is used only when a punctured wheel is changed, but also a necessary part of the preparation for departure. Active cyclists should consider purchasing two pumps:

  • portable. as part of an emergency kit or on long trips;
  • stationary with a stop and a pressure gauge. for periodic maintenance of your tires.

By the way, an ordinary car pump perfectly takes the place of a stationary pump. It is also suitable for bicycles, shows exactly how many atmospheres are pumped up, and does not take up additional space. Some people prefer to pump up on “professional” pumps at gas stations, but the lack of their professional tool can play a bad joke in the event of an unexpected situation or when you deviate from the standard route.

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Standard pressure

Here are some tables that will help you navigate in difficult situations, namely:

  • an unknown tire without markings was purchased;
  • no physical access to the bike;
  • the marking is incomprehensible, the numbers are marked in unknown units.

Mountain bike table:

The dependence of pressure on the type of surface and type of tire

What pressure should be in bicycle tires (how many atmospheres)

In this article, we will answer the question that many cyclists are asking: How much pressure should the tires of a bicycle be? Immediately, we note that tire pressure is the most important factor that affects the flotation and roll of your bike. That is why the pressure in the wheels must be correct.

The required pressure will help you determine the allowable values ​​on the tires. All products, regardless of the manufacturer, must indicate the minimum and maximum allowable pressure. In rare cases, only one value is indicated. the maximum. Also, these values ​​can be specified in different units of measurement: P.S.I. pressure in pounds (American designation) or BAR. pressure in bars or atmospheres. In the table below, we have compared all possible values ​​with a person’s weight so that you can easily determine the required pressure based on your weight.

A floor or hand pump with a pressure gauge will help you correctly determine the pressure in the wheels. Be careful when using compressor pumps, as they deliver a large amount of air at a high speed, which can lead to an explosion of the chamber.

Presta Valve

What is written on the tires

The secret to making the right choice is very simple: just look at the inflated wheel. Next to the information about the size of the tire there will be information about the permissible pressure range in the chamber.

Why is this information not shown on the camera itself? Because in it the only point subject to real stress is the nipple, and its mechanism is very reliable. Otherwise, the normal pressure, which increases by an order of magnitude during fast skiing, is taken by the tire, and how much it will be compressed is the main limitation.

So, if the pressure is too low, the tire will break closer to the rim, bite the chamber, leading to a breakdown, and if it is too low, it may just burst on one of the bumps or when driving on hot asphalt.

What should be the pressure in the tires of a child’s bike?

First of all, you need to look at the limits that are written on the tire, and certainly the pressure should not be less than the minimum specified. Further, the bulk of children weigh up to 50 kg. Therefore, for them, the pressure in the wheels of children’s bicycles must be maintained at about 2. 2.5 atmospheres. To the touch, this is a rather tight wheel and it is quite problematic for an ordinary person to squeeze it with your fingers. It is not worth pumping children’s wheels, otherwise the ride will be very hard.

If your child weighs more than 50 kg, then the pressure in the wheel should be taken from the table above.

How to check the pressure after inflation

The value can only be checked exactly with a pressure gauge. Therefore, you need a pump with a pressure gauge or a separate electronic bicycle pressure gauge. You can go to a car service to check the pressure and pump up the wheels. But before pumping up your bike with a car pump, think about it. After all, the auto repairman may not pay attention to the pressure and ruin your tires.

Experienced cyclists can measure pressure by eye. You can inflate tires with a pressure gauge, memorize the value and squeeze the tire with your fingers. Remember the feeling, so you learn to understand how inflated your wheels are.

Types of bicycles and the correct tire pressure at 26 inches: table

There are different types of tires and bicycles. Recommended values ​​have been developed for each type, which have been tested by many cyclists.

For mountain tires designed for extreme sports, the pressure should be chosen experimentally. It is individual for each cyclist.

Cross Country tires are versatile and are usually inflated to 3-4 bar. You can ride them in the countryside and on rough city roads.

Semi-slick tires are produced specifically for asphalt roads. Therefore, they must always be pumped up to the maximum amount. If inflated too little, the contact patch with the road will increase and it will be difficult to gain high speed.

Highway Bike Tire Pressure Table:

These are the maximum values, the most important thing is not to exceed them so that the tire does not burst. It is better to keep the tire pressure of road bikes a few tenths of a bar below the maximum.

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The most comfortable pressure should be in the wheels of a bike designed for mountainous terrain. It depends on the weight of the rider and the degree of roughness of the terrain. You also need to consider the width of the tires. The larger it is, the higher the pressure should be.

It is best to choose the value that is optimal for yourself in practice, rolling through the mountains with a pressure gauge.

Recommended bicycle tire pressure based on weight:

The tire pressure of a 26-inch bicycle depends on the person riding it.

How is blood pressure measured??

It is customary to denote pressure in three units of measurement:

Psi. Pound Force Per Square Inch,

Bar. equates to measurement in “atmospheres”, kilogram-force per square centimeter,

In the case when the manufacturer trades with the American market, the tires are marked with the designation Psi.

In Russia and in other European countries, the Bar label is used, because measurement is equated to “atmosphere”.

Rarely used in bicycle designation Pa (Pascals).

The ratio of these units is as follows: 1 Bar = 1,000,000 Pa = 14,504 Psi.

Pressure effect

In fact, the optimal pressure in the tires of a bicycle is a purely individual parameter, which each biker varies within certain limits for himself: for his riding style, for the planned route and the current level of training. The limits are set by technological constraints, which we will consider further.

Here are the main factors to consider when choosing an inflation level:

  • high pressure gives “roll-over”. rolling speed, saving the strength of the cyclist;
  • excessively high, in turn, can provoke a breakdown of the chamber against the rim from the inside;
  • similarly, low pressure leads to “snake bites” when a rim on an obstacle or bump pierces the chamber at two points at once and reaches the tire;
  • low pressure prevents damage to mechanisms on numerous bumps;
  • at low pressure better “grip” and easier to move on rough terrain.

Taking into account all the pros and cons, a single recommendation can be made: the wheels should be inflated enough to provide good traction and not damage the camera. For this, there are standards for what pressure is considered acceptable. We will consider them further.

Standard pressure

Here are some tables that will help you navigate in difficult situations, namely:

  • an unknown tire without markings was purchased;
  • no physical access to the bike;
  • the marking is incomprehensible, the numbers are marked in unknown units.

For a road bike, the pressure should be much higher, and typically ranges between 6.5. 9 atmospheres (up to 130 Psi), up to the maximum indicated by the manufacturer.

Air pressure for different types of tires

If you have semi-slick tires on your bike, then they should be inflated closer to the maximum value. This type of tire is designed for both asphalt and off-road driving. When you drive on asphalt, only the middle part of the semi-circular tire is involved in hitching to the surface.

And when entering a country road, the lateral parts of the tread come into play and the adhesion to the road increases. With a weak tire inflation, it will be difficult for you to drive on the asphalt, since the side tread will slow down the movement. Therefore, it is worth pumping closer to the max pressure.

Conventional cross country tires inflate up to 3-4 atmospheres. These all-round tires are good for both off-road driving and quiet driving on good roads.

Seasonal changes

With respect to the season, tire pressure varies dramatically. In winter, you can even exceed the maximum tire pressure and achieve excellent tread performance. In the summertime, do not inflate tires to the max value.

Increased air temperature, friction against asphalt can increase the already high pressure in the chamber. This can ultimately damage the tube and tire. In addition, a heavily inflated tire wears out faster.

Weight changes

Heavy cyclists should pay particular attention to wheel pressure. A large mass compresses the wheel and when driving over an obstacle, you can damage tires and rims. Above was a table of ratios of human weight and pressure in the wheels of a bicycle.