# How many atmospheres to swing a bicycle wheel

## 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 also 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.

## Standard pressure

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

• an unknown tire without markings was purchased;
• the marking is incomprehensible, the numbers are marked in unknown units.

## 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 also 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.

## Pressure effect

In fact, the optimal tire pressure 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”. 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.

### Markings

What do they write on the tires? For example, (2.38-4.0) is clearly atmospheres, or BAR, and (95-135) is Psi. If the figure has more than 3 digits or the prefix “k” (kilo), we are talking about metric Pascal. Most often, the desired value is located under the size designation and is duplicated in BAR and Psi in the form of a range, clearly indicating to what pressure you can pump.

Actually, the manufacturer indicates the range within which the tire can function, then. the freedom of the cyclist.

## BIKE TIRE PRESSURE WHAT SHOULD BE AND WHAT TO RUN?

Every bike lover is obliged to monitor the condition of his two-wheeled horse. It is from this that its service life and ride comfort will envy. When you go on your next trip, do not forget to measure your tire pressure. This procedure is mandatory, because the comfort while driving directly depends on it.

Oddly enough, first of all, the quality of cycling, especially on asphalt, depends on the pressure in the wheels of the bike. Under-inflated wheels easily break through and dampen a large percentage of the cyclist’s efforts, while over-inflated wheels can damage the camera and lead to its rapid wear. Accurate knowledge and experience of skiing will help you find the middle ground.

Many are accustomed to checking tire pressure using the old-fashioned method with their fingers. However, this method is very imprecise, and the concept of a “well-inflated wheel” can be very different for every cyclist. That is why it is better to always have a pressure gauge on hand to accurately determine the tire pressure.

## Main characteristics

The optimal level of atmosphere in bicycle tires is determined independently and depends on the riding style, characteristics of the road and professional training.

High tire pressure increases roll, speed and saves the rider’s energy.
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Pressure exceeding the recommended standards is fraught with a puncture of the bicycle tube on the inner surface of the rim ring.

• Below recommended pressure can also damage the rubber on the rim surface.
• Medium atmospheric values ​​that do not degrade the manufacturer’s parameters, prevents the tire from puncturing on uneven surfaces and increases traction, making it easier to ride on rough terrain.
• The bottom line is that the chambers are filled with enough air to maintain traction, but do not damage the bike. There are standard parameters for defining acceptable boundaries for all types of cameras.

### How is blood pressure measured?

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

• Psi. pound-force per square inch. pound-force per square inch;
• BAR. bars, usually equated to measurement in “atmospheres“;
• Pa. pascal.

Since many tire manufacturers focus on the American market, the Psi designation is most often found. In English-speaking sources, it is usually simplified to “pound”, or pound, that is, when they say that a pressure of 2 pounds, they mean Psi. This unit of measurement is outdated, used only in the United States, but, as they say, “more alive than all living things”.

Data from a smart pressure sensor on a smartphone screen

Bars are also obsolete units of measurement, but are actively supported in Russia and many other countries, incl. European. This unit of measurement is actively used, as it has something in common with the “atmosphere”, which is quite convenient for measurements.

Pascal is the only metrically correct unit on the list, but rarely used in bicycle designations.

The ratio between all units is as follows: 1 Bar = 100,000 Pa = 14.504 Psi.

### Here it is necessary to clarify a little what BAR, PSI and kPa are.

• BAR is the pressure in bars or atmospheres. For our people, the most understandable designation. It is used in many countries, including the post-Soviet space. 1 BAR = 1 atmosphere
• When the pressure in BAR is multiplied by 100, the result is kilopascals. In this case, it will be 250 and 420 kilopascals. Pascals are designated by English letters “Pa” or if in “kilo”. then kPa. They sometimes do the same, indicate the minimum and maximum pressure for which the tire is designed.
• PSI (pound-force per square inch). pressure in pounds per square inch. Used in Europe and some American states. It is designated as PSI or LBS / IN 2. For the given example, these are 36 and 60, respectively.

The relationship between BAR, PSI and Pa is as follows:

1 Bar = 1 atmosphere = 100,000 Pa (100 kPa) = 14.504 Psi,

With Bar and Pascals everything is simple, but with the translation of Bar to PSI, everything is a little more complicated, so here is a table for quickly converting pressure in bicycle tires from Bar to PSI and vice versa:

Let us mention one more designation for pressure, which is called “kilogram of force per square centimeter” or “technical atmosphere” and is denoted as “kgf / cm²” or “kgf / cm²”. It is quite rare, but it happens. We will dwell on the technical nuances, there are a lot of articles on this topic on the Internet, let’s just say that for a bicycle pressure it can be considered equal to 1 Bar or one atmosphere.

And for lovers of exact mathematics, here are the conversion factors:

1 kgf / cm² = 1 atmosphere = 0.98 Bar = 98.07 kPa = 14.22 PSI

When pumping up a tire, you need to clearly understand that the pressure in it should not be lower than the minimum specified and higher than the maximum. It is worth noting here that it is better to leave a small margin of 0.2-0.5 atmospheres, without pumping the tire to the maximum value so that it does not burst, especially in hot weather.

About what else the manufacturer writes on bicycle tires, as well as what other numbers mean, there is a separate article on it on our website, which is called “What do the numbers on bicycle tires mean”.

### What pressure should be 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.

## Bicycle tire pressure versus cyclist weight

This should be immediately clarified. The pressure in the tires of a road bike always varies between 6.5-9 BAR (up to 130 PSI) and does not depend very much on the weight of the cyclist.

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The pressure in mountain bikes is always lower.

Here is a table showing the dependence of the pressure in the wheels of a mountain and city bike on the weight of the biker:

You can focus on the following. for each additional kilogram of weight, the pressure should be increased by 1%.

The pressure in the tire directly affects its durability. Riding on badly inflated tires wears them out quickly.

## Additional tips for choosing the right pressure:

When choosing the right tire pressure for your bike, you should also pay attention to factors such as:

• The surface you are rolling on. So, when driving on rough terrain, soil or sand, it is enough to inflate the tires just above the minimum value, so the grip will be better. When driving on asphalt and flat surfaces, it is better to choose a value close to the maximum. this will improve the roll forward.
• Your bike type. Depending on the type of your bike, we recommend using different pressures. For a mountain bike, this value should be lower than for a sports road bike, for example. The principle here is that the narrower the tire, the higher the pressure in it should be. And vice versa.
• Outside temperature. In the heat, it is better not to pump the wheels to the maximum, because the air in the chamber heats up and the pressure rises additionally. And in winter, even when riding on snow, the pressure should not be lower than average in order to achieve maximum grip of the tread.
• User weight. Inflate the wheels more if you are heavy or carry heavy loads on your bike.

To summarize, it should be noted that there are no hard and fast rules for how many atmospheres should be in your wheels. And the right answer will be your accumulated experience.!

Unfortunately, bicycle theft is not uncommon these days. Especially when it comes to a large metropolis with busy streets and a large population.

At the time of buying a bike, you should pay special attention to the choice of a saddle, because a lot depends on its size and shape, including your safety.

Today, more than 280 kilometers of specialized bike paths located in almost all metropolitan districts.

See how the bike is reliably protected for sending to the regions.

### The Swing Bike Story “From Dream To Reality”. 40 Years in the Making

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## How many atmospheres are in the wheel?

Today I came to the parking lot to pick up the car and I see such a picture of a girl standing next to her DAEWOO matiz and pumping a wheel with an electric pump. Well, nothing ordinary you say, if not for one thing! When I entered the parking lot, she pumped rubber, walked by. rocked it, started the car to warm it up. continued, my car warmed up after five minutes. it does not stop! And then I wondered if she would pump the wheel?

Girl:. I don’t know, but the 3.5 arrow is worth!

Me:. “FUCK”, turn it off soon! The wheel may burst.

The girl frightenedly turned off the pump and asked:. how much should be?

I told her that for her funny car, the maximum is 2.0 atmospheres. And when you take into account the body and 1.8 is enough. And all the wheels must be inflated to 1.8. Lowered to the right atmospheres. The girl thanked. And I left.

But today I have a new post for novice drivers (they are teapots, so to speak). To what level of atmospheres do you need to pump the rubber of a car? I give advice

So, to begin with, I’ll tell you what is bad about under-pumping a wheel and what is bad about pumping. An under-inflated tire, like an over-inflated one, will firstly wear out faster, and secondly, if there is a high probability that it will simply be damaged. If you pump it over, there is a high probability that it will burst (however, fuel consumption can be reduced by up to 10%). And driving on such tires is not very comfortable, the suspension will become very, very stiff. If you do not pump it enough, then the probability that something will “jam” (the sides will be damaged) increases many times (also the fuel consumption will definitely increase, by 10-15%), however, driving on such tires is comfortable, but the car loses its dynamics (it is more difficult to accelerate), so like flat tires like “cakes”, they still need to be taken from the place. Therefore, pump, according to the average value, usually the parameters are applied to the car body (recommended by the manufacturer), there also the standard sizes are indicated (touched upon a little in this article).

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1) For small cars, class “A”. 1.5. 1.8 atm.

2) For cars of class B, C, D. 2.0. 2.5 atm.

3) For SUVs and jeeps. 3.0. 3.5 atm.

(14 votes, average: 3.29 out of 5)

### Weather

The temperature difference between the ambient air and the road surface in winter and summer seriously affects the readings of the pressure gauge. In the heat, the pressure inside the bicycle rubber increases, in the cold it drops. This should be taken into account when inflating the wheels.

Summer pressure parameters must be reduced, avoiding approaching the maximum values, in order to prevent the tire from bursting. In winter, sometimes it is even possible to exceed them, this will only improve the comfort and safety of traffic. Especially inflating tires to the upper limits is shown when driving in snow.

## How many atmospheres to swing a bicycle wheel

The quality and type of tires affects the run (rolling) of the bike. The material of the sidewalls of the tire, the tread pattern, as well as the pressure, also affect the roll-off.

Any cyclist knows that a pump is essential. You need to pump up tires constantly. over, the pressure in the tires of the bicycle is lost not only while riding, but also while it is parked (just not so quickly).

What determines the pressure in a bicycle‘s tire? First, the ride quality. On softly inflated tires it is more convenient to overcome unevenness of the roadway, with heavily inflated tires. the bike rides faster. Secondly, the pressure affects how long the tire will last, whether there will be punctures in it. If speed and ride comfort are a matter of taste, then the integrity of the rubber must be taken care of. It’s not even that the punctured wheel will have to be repaired. In some cases, when the pressure in the tires of the bicycle is selected incorrectly, not only damage, but also severe wheel breakdowns and injuries to the cyclist are possible.

1 bar.) Without inflation, once a month, the tire loses up to 15 psi.

For leisure bicycles, the tire pressure can vary from 1.5 to 4.5 bar, which can be found in more detail on the marking. The upper limit is preferable for those who drive on firm and level ground, the lower limit is for those who are more likely to find stones, puddles and grass.

How much pressure should a bicycle tire be? For sports models, the following is recommended:

 Track type Maximum, bar Forest 3.5 City half-slick five Road tube 7

The pressure in the rear wheel should be slightly higher than in the front. For a rider with a large weight, the numbers must be reduced, and for a child, accordingly, increased.

A pressure gauge is required for measurements. Now many bicycle pumps are equipped with this device immediately, but it must be borne in mind that a small square pressure gauge often gives a large error. When critical, it is best to purchase a measuring tool separately. And the owners of tires with a car valve can pump up and measure the pressure in them at the gas station.

An experienced cyclist can determine the tire pressure without the aid of instruments. You need to grab the tire with your hand and press on the camera with your thumb. The correct pressure will create the feeling that you are squeezing a ripe watermelon.

But within acceptable limits, you can inflate the wheels in the way that is more comfortable for you to ride.

### The Swing Bike

So, many people prefer that the pressure in the tires of the bicycle was higher. After all, it is convenient on the move. But beginners, on the contrary, are advised to reduce the pressure. And if you want the wheels to last as long as possible, choose the optimal (or average) value of 3 bar or 45 psi.

### Slicks

For driving on asphalt and well-rolled dirt roads, you need to pump up the maximum pressure.

Slick wheels are the easiest to swing for road and city bikes. Due to the fact that they have a small volume of wheels, the pressure must be high. The more pressure, the better the roll and the higher the speed. So swing boldly a little bit by 0.2. 0.4 under pumping to the maximum pressure indicated by the manufacturer on the tire, especially in hot weather.