# How Many Atmospheres Are There In A Bicycle Wheel 26

## Bicycle tire pressure

How much inflate the wheels? Many cyclists ask this question quite often. All well-known tire manufacturers indicate the size of the recommended pressure on the side of the tire. Most often, this figure is in the range from 35 to 60 psi (from 2.38 to 4.08 atmospheres).

1 atmosphere = 14.696 psi

A common mistake many novice cyclists make. Overpressure in mountain tires or insufficient pressure in the wheels of a road bike.

There are factors to look out for when looking for the ideal tire pressure:

Cyclist weight
. The performance of a tire at a given pressure depends on the rider’s weight. For example, a 66kg cyclist might find that the pressure is 2.38 atmospheres per square inch for a 26×2.25 inch tire. Too high and the grip Not good enough. Conversely, a 113kg rider may find that their tires are not sufficiently inflated and therefore bend and deflate.

The table shows tire inflation data for a mountain bike with a tire width of approximately 2 inches.

Tire volume and pressure are two inextricably linked indicators. The volume of the tires determines how a certain pressure appears to you. For example, a 700x25mm tire inflated to 2.38 atmospheres per square inch will be practically flat, while a 26×3.8in tire inflated to the same 2.38 atmospheres will feel firm to the touch. The wheel will bounce on uneven surfaces, not absorb them.

Much depends from the terrain. If you ride mostly on rocky tracks, it is better to inflate the tires a little harder in order to avoid wheel deflection and damage to the side.

1.) Primer, potholes. Inflate to average (based on tire readings) or slightly less.

2.) Asphalt, rolled paths. Pump almost to maximum.

Your driving style NOT less important than the area where you drive. The more aggressive the driving style, the more the wheels need to be inflated. Are you trying to choose the flattest sections of the track, the Detour Hills, or do you like to drive forward with indomitable energy? Do you like NOT to lift the wheels off the surface or do you like jumping on the bike, overcoming obstacles?

Rim width plays an important role in determining the lowest possible pressure without compromising efficiency. A wide rim holds the tires better than a narrow one. It allows you to use lower tire pressure without sagging.

Bus structure influences how it behaves under a certain pressure, in about the same way as the weight of a cyclist. High TPI tires are more flexible. TPI. This is the amount of nylon fibers per square inch of tire base. Low TPI tires have better puncture and tear resistance but are heavier. Higher TPI provides better traction, offering a smoother, softer ride and lighter construction. Typically, TPI values ​​range from 24 to 130.

Typically, tire pressures range from 35 to 48 psi (2.38 to 3.26 atmospheres). This pressure provides control over the road and maximum grip of the tires. An over-inflated tire to 50. 60 psi (3.40. 4.08 atmospheres) reduces ride comfort because the tire has less contact with the road.

When riding on asphalt, an inflated mountain bike tire wears out very quickly.

An insufficiently inflated tire 28. 32 psi (1.9. 2.17 atmospheres) is also fraught with danger. Because of this, you can easily pierce the camera by hitting a stone or simply hitting an uneven track. With such an impact load, the chamber is clamped between the rim and the obstacle, which can serve as a prerequisite for a “snake bite”. It will be difficult to eliminate a puncture of this kind. There is also a high probability of damage to the rim itself, this may entail expensive repairs or even replacement with a new one. It should be borne in mind that poorly inflated tires on a steep bend can be “ripped off”, and this can be a prerequisite for a fall. Most often, a stall occurs on the front wheel and is accompanied by a loud bang of the camera, as it bursts with ease, remaining protection tires.

Attention! DO NOT exceed the pressure indicated by the manufacturer on the tire sidewall!

We recommend:

On surfaces like snow and sand, inflated wheels will listen better.
In extreme heat, driving at high speed It is better not to inflate the tires to the maximum, as the wheels may overheat.
In winter, the wheels need to be inflated more, otherwise there may be damage to the tire and tube from the cold.

Road bike wheels Must be inflated to 95-135 psi (6.46. 9.18 atmospheres) as they have less air than mountain bikes.

## Air pressure for different types of tires

If you have a half slick, the low pressure negates its benefits. The meaning of the semi-slick is that, thanks to the semicircular profile, the tire rolls on a hard surface with a smooth part of the tread. And if the tire is poorly inflated, then it will be flattened, and your half-slick will paddle with its lugs even on asphalt. Therefore, in this type of tire we pump close to the maximum pressure.

Standard cross country tires 2 1-2. 3 inches requires a working pressure of 3-4 bar. This kind of rubber does NOT have too pronounced lugs, it is the most versatile tire for those who ride in forests.

Tires for more extreme riding are 2 3 “and more, and grip is very important here. The pressure is calculated experimentally so that the tire does not break through on drops and hard descents.

### Average values

A certain average rate of pressure in the tires of a road bike designed for riding on good, flat roads is 6.46. 9.18 atmospheres.

For a mountain bike, this figure varies from 2.38 to 4.08 atmospheres. For off-road driving, the optimal pressure will be from 2.38 to 3.26 atmospheres.

As for the variation within the “limits of what is permitted,” in the summer it is advisable to adhere to the lower limit, so that the air in the chambers warms up and expands, and does not damage it. In winter, on the contrary, the tube inflated to the upper border will allow the tread on the tires to adhere more tightly to the surface. The pressure in the chambers must also be correlated with the weight of the rider. Experts believe that it is necessary to add about 1% to the average value, based on each kilo of cyclist weight over 50.

A common mistake of many novice cyclists is excessive pressure in mountain tires or insufficient pressure in the wheels of a road bike. There are factors to look out for when looking for the ideal tire pressure:

### Units

Typically, tire manufacturers indicate the limits in which the cyclist can vary the inflation of the wheels. In our country, pressure is usually measured in atmospheres (at).

This value is approximately equal to a unit like Bar, which is common in Europe. On American tires and products intended for the American market, the permissible pressure is indicated in Psi.

### Tire volume and pressure

Tire volume and pressure. two inextricably linked indicators. The volume of the tires determines how a certain pressure appears to you. For example, a 700 x 25 mm tire inflated to 2.38 atmospheres per square inch will be practically flat, while a 26 x 3.8 inch tire inflated to the same 2.38 atmospheres will feel solid to the touch. a wheel will bounce on surface irregularities rather than absorb them.

By the way, we recommend:

Much depends on the area. If you ride mostly on rocky tracks, it is better to inflate the tires a little harder in order to avoid wheel deflection and damage to the side.

• Primer, potholes. inflate to the average value (guided by the readings on the tires) or slightly less.
• Asphalt, rolled paths. pump almost to maximum.

Your riding style is just as important as the terrain you drive. The more aggressive the driving style, the more the wheels need to be inflated. Are you trying to choose the flattest sections of the track, the Detour Hills, or do you like to drive forward with indomitable energy? Do you like NOT to lift the wheels off the surface or do you like jumping on the bike, overcoming obstacles?

Rim width plays an important role in determining the lowest possible pressure without compromising efficiency. A wide rim holds the tires better than a narrow one. It allows you to use lower tire pressure without sagging.

The design of a tire affects how it behaves at a given pressure, in much the same way as the weight of a cyclist. High TPI tires are more flexible. TPI is the amount of nylon fibers per square inch of tire base. Low TPI tires have better puncture and tear resistance but are heavier. A higher TPI value provides better traction, offering a smoother, softer ride and a lighter structure. Typically, TPI values ​​range from 24 to 130.

READ  How to identify a figure eight on a bicycle wheel

### Cyclist weight

The performance of a tire at a given pressure depends on the rider’s weight. For example, a 66kg rider may find that 2.38 psi for a 26×2. 25in tire is too high and the grip is not good enough. Conversely, a 113kg rider may find that their tires are under-inflated and therefore bend and deflate.

An approximate relationship between tire pressure and rider weight is shown below, which shows the inflation data for mountain bike tires with a width of 50 mm (2 inches).

Cyclist weight (kg) Pressure (atmospheres):

• 50 kg. 2.38-2.59 atmospheres
• 63 kg. 2.52-2.72 atmospheres
• 77 kg. 2.72-2.93 atmospheres
• 91 kg. 2.86-3.06 atmospheres
• 105 kg. 3.06-3.27 atmospheres
• 118 kg. 3.2-3.4 atmospheres

## How much pressure should be in the bike?

Many cyclists ask this question quite often. All well-known tire manufacturers indicate the size of the recommended pressure on the side of the tire. Most often, this figure is in the range from 35 to 60 psi (from 2.38 to 4.08 atmospheres).

The exact answer to this question depends on many factors. First of all, this is the expected area on which you plan to ride and the “profile” of the bike. High pressure is preferable if you are driving on asphalt, as it gives excellent roll, and low pressure provides strong traction on rough terrain. Riding style and weight of the cyclist also matter.

## What are the problems

If you constantly ride on wheels with less than optimal pressure, then most likely, cracks have already formed on the side walls of your tires. This usually leads to their premature erasure. Excessively high pressure increases the risk that the tire will simply burst at the most inopportune moment.

## Bicycle tire pressure

A bicycle is a reasonably well thought out and reliable device. But if used improperly, even the highest quality elements and systems can fail faster than it would have happened naturally. Last but not least, this concerns the wheels. For example, how much the pressure in the chambers of the bike corresponds to a certain norm will depend not only on the comfort during the rides, but also on the service life of the tires.

## How much to pump in tires in winter

If you ride a bike in cold weather, then it must be borne in mind that in the cold the pressure drops a little, so at home pump it about 20% above normal so that everything on the street comes into balance.

## How much pressure should be in bicycle tires

It would seem that it could be simpler. pumped up, crumpled with fingers, drove off. But no, there are some subtleties here. Tire pressure is the most important factor affecting rolling, flotation and handling.

I am not deliberately touching tubeless tires yet, because they are installed on more expensive bikes, and this is a topic for a separate article.

## Fatbike tire pressure

The fat bike is designed to ride on loose surfaces, its huge, large-volume tires Must flatten over bumps, this is achieved by low pressure.

Fat is the perfect bike for winter, so let’s talk about riding in the snow. For riders weighing 80kg, the following figures may be acceptable:

 10psi Rolled snow, paths 8psi dense snow 6psi and below Loose snow

Fat rolls much better on loose snow if you pump less than 5psi. But reducing the pressure below this line for tube tires can be a bad decision. the bike starts to obey the steering wheel poorly, “floats”, the nipple can break or shear due to the rotation of the tube. Therefore, I recommend switching to tubeless wheels for your fat bike, the bike will roll better and more stable at extremely low pressure.

In addition, do not forget such little things that since you have much less atmosphere in your tires, temperature fluctuations will be reflected in real pressure. For example, at home it was 7psi, drove out to a frost of 10 degrees, it became 4.3. Here is a table for you, by which you can calculate the approximate dependence on temperature:

 The pressure in the chambers depending on the outside temperature Indoor temperature, ° C Outside air temperature, ° C 25 ten five -five -ten -fifteen -20 740 Atmospheric pressure, mm Hg psi at room temp. Psi outside depending on temperature 4 3.0 2.7 2,3 2.0 1.7 1.3 1.0 4.5 3.5 3.1 2.8 2.4 2.1 1.7 1.4 five 3.9 3.6 3.2 2.9 2.5 2.2 1.8 5.5 4.4 4.1 3.7 3.3 3.0 2.6 2.2 6 4.9 4.5 4.1 3.8 3.4 3.0 2.7 6.5 5.4 5.0 4.6 4.2 3.8 3.5 3.1 7 5.8 5.4 5.1 4.7 4,3 3.9 3.5 8 6.8 6.4 6.0 5.6 5.1 4.7 4,3 nine 7,7 7.3 6.9 6.4 6.0 5.6 5.2 ten 8.7 8.2 7.8 7.3 6.9 6.4 6.0

## Why it’s important to inflate your tires with the correct pressure

• The more inflated the tires, the better it rolls, the less fatigue
• The heavier the cyclist, the more you need to pump
• The more inflated the tires, the more it shakes on bumps
• If the pressure is weak, then crossing the curb, you can punch the chamber into the edges of the rim (snake bite)

And now the logical question is how to find out within what framework you need to pump, how many atmospheres to pump specifically? The pressure in bicycle tires is measured in atmospheres (BAR) or PSI, and most often, the permissible range is written on the sidewall of the tire in PSI (one atmosphere is equal to 14.7 psi). Here is the average table for the average cyclist riding no extreme, on asphalt and dirt roads.

This information is enough for you to ride comfortably enough, while the tires should not suffer from over-pumping or under-inflation. Well, for those who care about details, we go deeper.

With a large one for paved roads, everything is simple. the more pressure, the better the roll. Look on the sidewall of the tire, there must be written a valid value, in psi, or in bar (atmosphere). If the maximum value, for example, 8 Bar, then score 7.5 and enjoy the speed.

I highly recommend getting a good floor pump with a pressure gauge (I bought it here), because pumping a road tire with a portable pump is still a torment, even if it is capable of delivering high pressure.

I will add that the air is etched through the rubber itself, and in about a couple of weeks the pressure drops by 1-2 atmospheres. Fingers It is not felt, so a floor pump with a pressure gauge is just the right thing to do.

If you inflate a road tire below average, you can catch a tube breakdown called a snakebite. This happens when the wheel hits a hard object and the tire pushes against the rim. The result is two small holes that look like a snake bite.

### Air pressure for different types of tires

If you have a half slick, the low pressure negates its benefits. The meaning of the semi-slick is that, thanks to the semicircular profile, the tire rolls on a hard surface with a smooth part of the tread. And just got on soft ground, the side of the tread comes into play.

And if the tire is poorly inflated, then it will be flattened, and your half-slick will paddle with its lugs even on asphalt. Therefore, in this type of tire we pump close to the maximum pressure.

Standard 2.1-2.3 inch cross country tires require a working pressure of 3-4 bar. This kind of rubber does NOT have too pronounced lugs, it is the most versatile tire for those who ride in forests.

Tires for more extreme riding are 2.3 “and more, and grip is very important here. The pressure is calculated experimentally so that the tire does not break through on drops and hard descents.

## Mountain Bike Tire

Off-road bikes are a little more complicated. The point is that you need to strike a balance between grip and coast. The more inflated the tire, the better it rolls (on a flat and hard surface), but due to the rigidity it cannot be “lick” surface. adhesion deteriorates.

High pressure maintains the semi-circular profile of the tire, while maximum grip is possible when the entire contact patch is engaged. In other words, the more the tire “flattens”, the better for cross-country ability and handling. On the other hand, if you pump too weakly, the roll will suffer and the same “snake bite” is possible.

Since basically all chamber MTB rubber has an allowable pressure range of about 2-4 atm, then I would say that the working pressure is between 2.2 and 3 atmospheres for an adult male weighing from 75 to 90 kg. It is impossible to say more precisely. there are a lot of factors, you need to experiment with a specific tire and a specific Trail where you ride.

Different tires behave differently at the same pressure, also the behavior depends on the width of the tire, it is believed that less pressure can be pumped into a wider one. The weight of the cyclist is very important, for obvious reasons.

READ  Remove Rear Wheel Bicycle With Disc Brakes

Take a pump with a pressure gauge and try to find the lower pressure limit at which the tire will NOT break through yet. Then try how the bike rolls at that pressure. Add air if needed. You need to find a middle ground for both soil and asphalt.

### How much to pump in tires in winter

If you ride a bike in cold weather, then it must be borne in mind that in the cold, the pressure drops a little, so at home pump it about 20% above normal so that everything on the street comes into balance.

Here I have described how to choose the right bike tires for different riding styles, I advise you to look.

I would NOT like to see a picture of a cyclist with a pump in the imagination of readers, who only does what sets different pressure under different conditions.

In fact, finding a middle ground is quite simple, you just need to devote half an hour. I advise you to pay attention to this issue, if you are a beginner, then most likely you have not even thought about it.

In order not to lose sight of this site: follow the link. You will receive an email notification when a new article is released. No spam, you can unsubscribe in a couple of clicks.

You can say thank you for the article by reposting on or :

Yes, the right pressure is very important.
NOT further than yesterday before leaving I did NOT check, I went. As I said, I have MAXXIS Larsen TT, and it has very soft sidewalls.
I feel that the rear wheel drives at cornering speed. I drove on the road to a tire service to check the pressure. I usually ride at 3.5-4 atm, but here it is only 2.5 atm. That immediately unpleasant sensations that the wheel will break off or break the tires.

An expensive pump with a monometer for MTB in our time is superfluous. At any, or almost any, gas station, you can pump the required pressure. And for minor repairs, a mini-pump from the same teahouse is enough, fill 3 and drive to the gas station.

He disagrees that the floor pump is unnecessary. It is not always possible to get to the gas station or it is not so close to check the pressure and pump up the wheel.
And you don’t have to buy an expensive pump. Accidentally I got to Decathlon on a sale and bought an excellent floor pump there for 500r. With a long hose, high, not very thick working chamber, which makes it easy to pump high pressures, aluminum body and footrest, which are rare in cheap options

I like more pressure. I swing 4 atm before, 4.2 back. Rubber Kenda 8 small blocks 2.3 “(:)), I myself weigh 87-89kg, I drive both on the ground and on the asphalt. Rows normally on mud, but sand is death. Here I bury myself (well, it’s understandable :)) So I shake it so that the rubber does NOT play on turns, but it is Jumping and rolls on pebbles, but very precise control. At high speed (50-70 km / h) it is very noticeable. Then, at a lower speed, I began to notice this effect. Well, he began to pump in the area of ​​maximum pressure. By the way, with intensive pedaling, the pumped rubber does NOT start to swing.

This is where you accelerated to 70 km? NOT a rope behind the car? Or when he was dropping off the balcony?

Maybe he has a Gravel bike. Ie shoser with spike. He can roll 50-70. On MTB, yes, behind a truck only or from a hill, or standing next to a bike on a cigarette

The floor pump is a thing! I recently bought myself, with a large working chamber, a pressure gauge. T.K. There are several bicycles in the family, and on mine there are also several sets of rubber, which I change depending on the type of coating, it saves time and effort perfectly, plus on different bikes there are also different types of nipples, but here there are two separate heads. DO NOT twist anything necessary, convenient in general # 128578;
By pressure, I came to the conclusion that I pump the toothed rubber of the Richie up to 3.5 and it is pleasant, soft and tenacious on it, though not very fast, and I pump Marathon Supreme slicks to 5 atm, on the asphalt it’s a fairy tale, although recently I have already started on soils in them to meddle because the slicks are high 622 × 50 # 128578;
But with my wife’s bike, everything is more complicated, it is much easier than and here I do not know whether the rubber is to blame or the fork, she complains that she was driving as if she was wearing it on the sand even on asphalt, the descent of the rubber saves a little, but only a little.

Abysmal, with MAXXIS, these are known problems. in the sense of soft sidewalls and insufficient pressure. I have more experience with MAXXIS Overdrive, now here is Gipsy, but the story is the same. As tires they are good. tenacious, and do not slide even on wet and dirty asphalt, albeit slicks. But they cut through the sides when under-pumping and overloading. To prevent them from being driven like that, it is advisable to select a width that is suitable for the rim, rather than putting, say, 2 inches on the 18 mm rim landing width. Even stock Specialized is guilty of this.
This is why I prefer Schwalbe CX Comp or Road Runner out of semi-slick tires. because these are mass tires, they are produced in a wide variety of widths, and it is not difficult to choose the width for the rim (remove drift).
Of course, no one canceled the correct pumping # 128578;

Sergey K, I didn’t want to write about this directly in the article, but I also had problems with Makksis. # 128577; Exactly what you say. Therefore, I cannot recommend them to readers.

Sergei, so if he drives, on the asphalt. is it on the contrary, underpumping? Or what is meant by “drives”?

Chiba, will be. simislik, but manufacturers do not always indicate this clearly. So it’s better to look through with your eyes.

Abysmal, I also cannot imagine myself without a pump of a floor house.

It is unlikely that it is under-pumping, because K. We pumped up to 4 and gradually lowered to 2, as the descent it drives less, but the roll-off falls. Based on her description, it is like driving on ice. I really sin more and more on the fork, the bike has been used for 3 or 4 years, and before this season it was used very little, now something happened to the fork. it just spring back if you squeeze it, however if you press the handlebar and release it the front wheel will jump, and if you lift the wheel in the air and throw it, then the led will jump, the fork there is a simple SR XCT, i.e. A dummy fork, but on mine, too, an extremely simple RS XC28, everything is completely different (She does not jump). I’m thinking, maybe this elastomer has broken (it happens at all or not, I don’t know) or it’s stretched out so it just dangles inside.

“If you press the steering wheel and release, then the front wheel will jump, and if you lift the wheel into the air and throw it, the bike will jump, the fork is a simple SR XCT”. the damper cartridge in the right leg died. Nitrogen left from the chamber or glass oil or both.
This is only to replace the entire plug. There are no zips for this, and the cartridge is non-separable and maintenance-free

### Few definitions

A bike. wheeled vehicle propelled by human muscular power through foot pedals or hand levers. Information about bicycles and scooters before 1817 is questionable. So, the drawing of a two-wheeled bicycle with a handlebar and a chain drive, attributed to Leonardo da Vinci, or his student Giacomo Caprotti, according to many, is a fake. The production of bicycles has played an important role in creating the technical base for the second types of transport, primarily cars and airplanes. Many of the metalworking technologies developed for the production of both bicycle frames and bicycle second parts were later used in the production of automobiles and aircraft. Postal services in many countries have been using bicycles since the late 19th century. For example, the British Post has been using bicycles since the 1880s. The total number of postmen-cyclists is 37,000 in the UK, 27,500 in Germany, 10,500 in Hungary. Cycling started right after the invention of bicycles. The first races were carried out on penny-farthing and other dangerous bicycles, which often resulted in injuries. Currently bicycles are the most popular in the countries of Northern and Western Europe. The most “cycling” country in Europe is Denmark, the average inhabitant of this country travels 893 kilometers per year on a bicycle. Fred Rompelberg is installed in the Bonneville Salt Plain in 1995. A classic design bike consists of a frame, a steering fork with a handlebar and a front wheel, a rear wheel, a saddle on seatpost, pedals with cranks, chain transmission and brakes. In order to prevent the two-wheeled bicycle from falling, you need to constantly maintain balance. Since the support area of ​​a bicycle is very small, such a bicycle can only be dynamic balance. Walking efficiency is low, with each step lost about 35% of kinetic energy. When walking, there is a vertical movement of the general center of mass, which takes part of the work done by the muscles. Cm.

READ  Make from a man's bike a woman's

Atmosphere. non-systemic unit of pressure measurement, approximately equal to atmospheric pressure at the Earth’s surface at the level of the World Ocean.

## How many atmospheres are there in a bicycle wheel?

Overpressure mountain bike tires and underpressure road bike tires are a common mistake many novice cyclists make. Road Bike Wheels Must be inflated to 95-135 psi as the air volume is low. As for mountain bike tires, due to the higher air volume, they need to be inflated between 35 and 60 psi. In addition, due to the higher air volume and low pressure, the loss of the latter in the tires of the mountain bike is less. It is sufficient to check it once a week, while the road tire pressure needs to be checked daily.

When riding off-road, the pressure in the wheels of your bike depends on the type of surface and your weight. It usually ranges from 35 to 48 psi. This pressure provides control over the road and maximum grip of the tires. An over-pumped tire to 50. 60 psi reduces ride comfort: the tire has a small contact patch with the track surface, which is fraught with wheel breakdown and fall. When riding on asphalt, an inflated mountain bike tire wears out very quickly.

An under-inflated 28. 32 psi tire is also fraught with danger. First, you can easily pierce the camera by hitting a stone or simply hitting an uneven track. With such an impact load, the chamber is clamped between the rim and the obstacle, which can serve as a prerequisite for a “snake bite”. This kind of puncture of the chamber is difficult, because one blow can get from one to four holes in the chamber. Secondly, there is a high probability of damage to the rim, which can entail expensive repairs or replacement. Thirdly, on a steep bend, you can “rip” unfilled tires from the rim, which can be a prerequisite for falling. Most often, a stall occurs on the front wheel and is accompanied by a loud camera bang. It bursts easily, leaving the protection of the tire.

### Unsuccessful attempt to steal a bike. Similar questions

How many atmospheres are in a car wheel?
To find out exactly the number of atmospheres in the wheels, you should refer to.

### What keeps the pressure in the wheel

You need to understand that the pressure is not held by the camera, but by the tire.

## How much pressure should be in bicycle tires

It would seem that it could be simpler. pumped up, crumpled with fingers, drove off. But no, there are some subtleties here. Tire pressure is the most important factor affecting rolling, flotation and handling.

I am not deliberately touching tubeless tires yet, because they are installed on more expensive bikes, and this is a topic for a separate article.

### Here it is necessary to explain 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. Pascal are denoted by English letters “Pa” or if in “kilo” it is 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. In the example given, these are 36 and 60, respectively.

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

1 Bar = 1 atmosphere = 100000 Pa (100 kPa) = 14.504 Psi,

1 PSI = 0.069 Bar

With Bar and Pascal 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 / cm”. 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 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 tires, 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 atmosphere, without pumping up the tires to the maximum value, so that it does NOT burst, especially in hot weather.

In 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”.

### High lug tires

All toothed tires designed for travel on soft ground, sand, snow are best used with high pressure. In this case, the adhesion will be maximum.

With a large one for paved roads, everything is simple. the more pressure, the better the roll. Look on the sidewall of the tire, there must be written a valid value, in psi, or in bar (atmosphere). If the maximum value, for example, 8 Bar, then score 7.5 and enjoy the speed.

I highly recommend getting a good floor pump with a pressure gauge (I bought it here), because pumping a road tire with a portable pump is still a torment, even if it is capable of delivering high pressure.

I will add that the air is etched through the rubber itself, and in about a couple of weeks the pressure drops by 1-2 atmospheres. Fingers It is not felt, so a floor pump with a pressure gauge is just the right thing to do.

If you inflate a road tire below average, you can catch a tube breakdown called a snakebite. This happens when the wheel hits a hard object and the tire pushes against the rim. The result is two small holes that look like a snake bite.

## What and how is measured?

Bicycle tire pressures are measured in pounds per square inch, Pascals, and atmospheres (bars). The atmospheric pressure of the Earth at the edge of the ocean level reaches almost 1 bar. This unit serves as the value multiplied by the factor indicated on the wheel. Calculation formula: 1 atm = 101325 Pa = 1 bar. Pounds per square inch is an obsolete mayor. Bar. too, but it is firmly associated in people’s memory with the value of the pressure of one earth’s atmosphere (value at sea level). One bar equals approximately 14.5 psi.

The number of bars rarely exceeds 10 units. The number of pounds per square inch is sometimes more than 100 The number of kilopascals is a three-digit (but can be over a thousand) number. Kilopascals are converted to bars or pounds per square inch. According to the above formula, the cyclist inflates the wheel. Deviation from the recommended range of values ​​will result in a high accident rate. You can convert kilopascals to megapascals (MPa) by dividing the number of kilopascals by 1000.

## 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 surface, it is better to choose a value close to the maximum. this will improve the roll.
• Your bike type. We recommend using different pressures depending on your bike type. 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 increases additionally. And in winter, even when riding on snow, the pressure should be NOT below average in order to achieve maximum tread grip.
• 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 your wheels should have. And the right answer will be your Accumulated Experience!

Unfortunately, bike 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.