How much to swing the wheels on a bicycle 29

Approximate values ​​by type of rubber

much, wheels, bicycle

Optimizing the inflation rate of a bicycle tire depends on the type of tire used, and in particular mainly on the type of tire. If the bike is shod in slick or semi-slick rubber, then minimizing pressure is permissible only on hot days. As shown by bench tests of slick (low-relief) tires, a decrease in the level by 25.0% to the optimal level nullifies all their advantages.

You can also give recommendations for inflating wheels with different tires.

If the bike is shod with 2.0… 2.3 inches wide tires with cross-country protectors, then the optimal pressure range is 3.0… 4.0 atmospheres (bar). A decrease in this value will require an increase in the expenditure of muscle energy, and exceeding the level of inflation of bicycle tires above the upper limit, when driving off-road, often leads to an explosive destruction of the tire.

Extreme tires (Downhill / Slalom 24 ″ × 2.10 or Kenda K905 20 x 1.95 ″) with a complex tread, are best inflated to the average recommended pressure. This will provide the necessary adhesion to the supporting surface. In the future, its indicator can be adjusted for specific driving conditions.

BMX stunt models should be inflated medium, between high and low, to have sufficient traction, and then subtly varied for each stunt.

For winter riding, it is worth choosing a pressure slightly higher than normal, since at sub-zero temperatures the air in the tire becomes denser and takes up less space.

How to check the pressure after inflation

The exact value can only be checked 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.

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.

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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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.

Seasonal changes

Seasonal adjustments are quite serious, mainly related to mountain bikes. In the summer, you should slightly underestimate the pumping and not rest on the maximum. Hot asphalt also heats up the air inside the chamber, which increases the volume and therefore the pressure. Also, a pumped tire wears out very quickly.

In winter, you should sometimes slightly exceed the maximum in order to achieve maximum work from the tread, especially if the rubber is selected with spikes.

Theoretical knowledge

If the wheels are over-inflated, the bike will roll well, but the tire will not absorb at all on uneven surfaces. All difficult sections will be much harder, since the contact patch of the tire with the ground will have a minimum area, and you will be skidded around the bends. Needless to say, when cycling in winter, the situation is exacerbated by the slippery surface. In addition, pumping can cause the wheel to explode. Old Soviet cameras are especially susceptible to this, the material of which is already turning into dust from old age. The tire does not break due to excessive pressure immediately, but for example on a hill, where a pebble falls under the wheel. This situation is dangerous because sometimes literally rips the tire off the wheel.

The air pressure in the tires of a bicycle also affects the permeability of the wheel. Pumped rubber easily picks up all the carnations and glass on the road.

If the tires are flat, then the situation is no better than with inflated wheels. The tire does not sit tightly on the rim, it can slip off the wheel, and when driving onto the curb, a puncture can form (the so-called snake bite). The roll of the bike decreases and more and more force is required to pedal. However, when choosing between an under-inflated tire and an under-inflated tire, it is better to opt for an under-inflated tire. But we must not forget about reasonable limits. If the tire drags like a rag, then you are clearly mistaken with the pressure.

Weight changes

For heavy riders or heavily loaded bikes, it is very important to add pressure, as a lot of mass will squeeze the wheel of the bike and problems with insufficiently inflated cameras can come out much earlier.

Recommended pressure for weight addition is 1% for every kilogram of rider weight over 50.

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 riding 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.

  • Pressure effect
  • Theoretical knowledge
  • What is written on the tires
  • How is blood pressure measured?
  • Markings
  • Important Factors
  • How riding style and tire pressure depend.
  • What to pump up
  • Standard pressure
  • Children’s bicycles
  • Seasonal changes
  • Weight changes
  • Approximate values ​​by type of rubber
  • How to check the pressure after inflation
  • Determining factors
  • Conclusion
  • Video
  • Question answer

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? It should be noted right away that tire pressure is the most important factor that affects the flotation and roll rate of your bike. That is why the pressure in the wheels must be correct.

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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.

Cyclist weight (kg) Pressure (psi) Pressure (bar)
fifty 35.38 2.38. 2.59
63 37.40 2.52. 2.72
77 40.43 2.72. 2.93
91 42.45 2.86. 3.06
105 45.48 3.06. 3.27
118 47.50 3.2. 3.4

A floor or hand pump with a pressure gauge will help you to 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.

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. We recommend using different pressures depending on the type of your bike. 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.!

Approximate values ​​by type of rubber

You can also give recommendations for inflating wheels with different tires.

For slicks and semi-slick, the use of pressure below the maximum is allowed only in hot weather. a quarter shortage already negates the entire effect of such rubber, because it is sharpened for the maximum diameter and the absence of resistance.

Classic cross-country treads 2-2.3 inches wide inflate to 3-4 BAR, depending on the track and habit, a lower value will make riding a strength training, and higher values ​​are simply not allowed by manufacturers, as they lead to a real explosion at peak load.

Extreme tires, whether downhill 2.3 wide tricky treads or BMX models for stunts should be inflated medium, between high and low to have sufficient traction, and then subtly varied for each trick or descent.

Weight changes

For heavy riders or heavily loaded bikes, it is very important to add pressure, as a lot of mass will squeeze the wheel of the bike and problems with insufficiently inflated cameras can come out much earlier.

Recommended pressure for weight addition is 1% for every kilogram of rider weight over 50.

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.

Seasonal changes

Seasonal adjustments are quite serious, mainly related to mountain bikes. In the summer, you should slightly underestimate the pumping and not rest on the maximum. Hot asphalt also heats up the air inside the chamber, which increases the volume and therefore the pressure. Also, a pumped tire wears out very quickly.

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In winter, you should sometimes slightly exceed the maximum in order to achieve maximum work from the tread, especially if the rubber is selected with spikes.

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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 specifies the range within which the tire can function, then. the freedom of the cyclist.

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:

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  • 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.

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.

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.