How many atmospheres to swing 26 bicycle wheels

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 intended terrain 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.

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 permitted limits, in summer it is advisable to adhere to the lower limit so that the air in the chambers, heating and expanding, does not damage it. In winter, on the contrary, a tube inflated to the upper border will allow the treads 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 many novice cyclists make 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.

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.

Cyclist weight

The performance of a tire at a given pressure depends on the weight of the rider. For example, a 66kg cyclist might find a pressure of 2.38 atmospheres per square inch for a 26×2 tire. 25 inches 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 cyclist 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

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 the asphalt. Therefore, in this type of tire we pump close to the maximum pressure.

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Standard cross country tires, width 2. 1-2. 3 inches requires a working pressure of 3-4 bar. Such rubber has not very pronounced lugs, it is the most versatile tire for those who ride in forests.

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

Tire volume and pressure

Tire volume and pressure are two inextricably linked metrics. The volume of the tires determines how a certain pressure will appear to you. For example, a 700x25mm tire inflated to 2.38 atmospheres per square inch will be nearly flat, while a 26×3 tire. 8 inches, inflated to the same 2.38 atmospheres, will feel solid to the touch. the wheel will bounce on uneven surfaces, not absorb them.

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

  • Primer, potholes. pump to medium (based on the readings on the tire) or slightly less.
  • Asphalt, rolled paths. pump almost to maximum.

Your riding style is just as important as the terrain you are driving. The more aggressive the riding style, the more the wheels need to be inflated. Are you trying to choose the flattest sections of the track, bypassing the hills, or do you like to drive forward with indomitable energy? Do you like to keep the wheels on the surface or do you like to bounce on the bike, overcoming obstacles??

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

many, atmospheres, bicycle, wheels

The design of a tire affects how it behaves at a given pressure in about 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. Higher TPI provides better traction, offering a smoother, softer ride and lighter construction. Typically, TPI values ​​range from 24 to 130.

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, i.e., when they say that a pressure of 2 pounds, they mean Psi. This unit of measurement is outdated, used only in the USA, but, as they say, it is more alive than all living things.

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.

Why the pressure has to be right?

It should be noted that tire pressure is still an individual parameter. But there are also factors to consider when inflating bicycle tires:

  • Pressure close to the maximum value. gives the bike speed and saves energy;
  • Pressure close to the minimum value. improves grip, especially off-road;
  • High pressure. can lead to breakdown of the chamber from the side of the rim;
  • Low pressure. can also lead to breakdown of the chamber when hitting an obstacle violently;
  • Low tire pressure smoothes out numerous irregularities in the road.

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High pressure pump for bike and bicycle forks

You have decided on the numbers and approximately understood how much pressure should be in the tires. It remains to find a pump with a pressure gauge. The product is quite specific and is used more by those people who have an air shock absorber on their bike.

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You cannot pump the shock absorber with an ordinary pump, therefore a high-pressure pump is used. This pump also has adapters for inflating bicycle wheels. True, you have to work hard, because it is one thing to pump up a small shock absorber, and quite another to pump up a bicycle wheel. But there are also pluses, you will clearly record the required tire pressure on the pressure gauge.

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.

Signs of inappropriate tire pressure

A breakdown is the surest sign that you have inflated the tires incorrectly. It will burn from both too low a value (less than the manufacturer recommends) and too high. If you cannot visually and touch determine the degree of inflation, take a pressure measurement with a pressure gauge.

Now you know how much pressure should be in the tires of the bicycle. It is better to pump it with a pump with a pressure gauge, which will help you choose the optimal value.

What pressure should be in bicycle tires

Typically, tire pressure limits are indicated on the side of the tire. For example, min 2.4 Bar (32 PSI). max 4.1 Bar (56 PSI). These numbers mean that the tire pressure should be at least 2.4 atmospheres and not more than 4.1 atmospheres. The difference between the minimum and maximum value is almost two atmospheres, and how to choose the right one, in this case, the pressure?

This breakdown depends on the road on which you will be driving:

  • When driving on an asphalt road, the tire pressure should approach the maximum value indicated on it;
  • When driving on a dirt road, the pressure should be kept slightly above the minimum value or average.

This is explained by the fact that when driving on asphalt, the friction of poorly inflated tires increases, and the speed of the cyclist is lost. When driving on a dirt road, the contact should be maximum and therefore the tire pressure should be slightly higher than the minimum value. In addition, a slight pressure softens the ride on bumps and off-road.

Pressure effect

In fact, the optimal pressure in the tires of a bicycle is a purely individual parameter that 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 rise to 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 over 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.

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, i.e., when they say that a pressure of 2 pounds, they mean Psi. This unit of measurement is outdated, used only in the USA, but, as they say, it is more alive than all living things.

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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.

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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.

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, i.e., when they say that a pressure of 2 pounds, they mean Psi. This unit of measurement is outdated, used only in the USA, but, as they say, it is 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.

Bicycle tire pressure

They came in the morning to their iron horse and you see. the wheel is flat. How to pump it up? Correctly pump. And how to pump it up correctly? How many atmospheres. How often do beginners think about this. Previously, after all, how they did it. I pumped up the wheel, tried it with my fingers. will it squeeze or not. He sat down and looked at the wheels. whether they were sold or not. They sold out. let us down, did not sell out. went. It was called. check for a bulging naval eye.

With a properly inflated wheel, it is pleasant and easy to ride. It provides good rolling, speed, tire durability and, ultimately, the safety of the cyclist.

What should be the pressure in the tires of the bicycle?

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 riding will help you find the middle ground.

What to pump up

Bicycle luggage requires maintenance and pumping very often. Even on the most enduring 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.

many, atmospheres, bicycle, wheels

City, or, simply, budget bicycles, 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, 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 absence of their own professional tool can play a bad joke in the event of an unexpected situation or when you deviate from the standard route.

What keeps the pressure in the wheel

You need to understand that it is not the camera that holds the pressure, but the tire.