# What Is The Pressure In The Wheels Of The Bicycle 29

### For fatbikes

Fat bikes are best for riding on sand, snow and rocky roads. An example is winter driving on a road that is close to a railway embankment and is covered with a 10 cm layer of snow. The running zone of a fat bike tire is 2-3 times wider than in rubber for a mountain bike or city bike. The large contact area of ​​the tire with the road brings the fat bike closer to the wheels of the motorcycle. On a fat bike, you can freely ride on the off-road forests and fields. Pounds per square inch table of normal pressure values ​​adapted to riders with an average weight of 80 kg.

### 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 tire with a semicircular profile is involved in the hitch.

And when entering a country road, the lateral parts of the tread come into play and the adhesion to the road increases. If the tire inflation is low, 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 are inflated to 2-2.5 atmospheres. These all-rounders are good for both off-road driving and quiet driving on good roads.

## 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.

The norm for road bikes is 8-11 atmospheres (bar) depending on the specific tire, the weight of the bike and cyclist, average and extremely high speed. Here the general rule works: pumping up the pressure recommended by the manufacturer (maximum 0.5 atmospheres), you quickly and safely finish eating from point A to point B of your route. You are unlikely to be able to squeeze 10 atmospheres with a hand pump. Use a hand or foot pump with a pressure gauge. If your pressure limit is 9.5, then download 9 and drive safely at maximum speed.

All chambers gradually poison the injected air through their micropores. Part of it is also vented through the old nipple that has become loose from thousands of pumping. Rubber itself allows molecules and atoms of atmospheric gases to pass through: compare the molecular size of the vulcanized polymers (this is a long chain) of which the chamber is made, and the sizes of the nitrogen and oxygen molecules. The longer you use the same camera, the more intensely it poison the air. the gradual stratification, drying out of the rubber structure does its job. For example, in “KamAZ” wheels, pumped over due to congestion, eventually burst at full speed (one at a time, as the rubber resource depletes).

A road bike with 10 bars in wheels, running at 40 kilometers per hour and carrying a biker weighing 80-90 kg, undergoes the same. During the week, the working pressure in the wheels drops by about 1.5 atmospheres. Feel the wheel after a 300-kilometer marathon, you are unlikely to feel that it has lowered, but the pump pressure gauge (or car compressor) will immediately indicate this.

If you have your own pressure gauge at hand, you can pump up the wheels of a bicycle for free at any service station using an automatic compressor.

It inflates a bicycle wheel in a few seconds, and when the set pressure is reached, the automatic switches off the air blower. A bicycle owner’s own pump is not only a portable tool that allows you to inflate a wheel after a rubber repair. For cycling professionals, a pump is a tool that they use regularly, and often they have to. The lot of a sports bike is fast driving (up to 40 km / h), highway racing and a cycle track. Pumping its wheels below the average pressure will lead to an early breakdown of the chambers. Broken, cracked, rough, cracked and bumpy asphalt is an additional problem.

If you inflate the wheel of any bike 2-3 times higher than the maximum value, then this pressure is guaranteed to explode the tube with the tire after the first hundred meters of travel. But even if the rubber could withstand such pressure, the rim would easily get severe damage. “Top” pressure. cannot, at which the tire bursts, and then at which the wheel will break.

## Pressure effect

In fact, the optimal tire pressure of a bicycle is a purely individual parameter, for each biker varies within certain limits for himself: for his riding style, for the planned track 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 “rolling”. rolling speed, to save the cyclist’s strength;
• 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 the rim on an obstacle or bump punches 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 drawn: the wheels must be inflated enough to provide good traction and do not damage the camera. For this, there are standards for what pressure is considered acceptable. We will consider them further.

## The pressure in the tires of the BICYCLE, what should be and WHAT TO RUN?

Every bike lover is obliged to keep an eye on the condition of your 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.

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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 extinguish 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 will help you find the middle ground.

Many are accustomed to checking the pressure in Dedovsk tires using the finger method. However, this method is very imprecise, and besides, the concept of “well-inflated wheel” can be very different for every BIKE. That is why it is better to always have a pressure gauge on hand to accurately determine the tire pressure.

Its cost is quite low, so everyone can afford such an acquisition.

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

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 extinguish 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 will help you find the middle ground.

## Influence of pressure on ride quality

The correct tire pressure is a specific parameter for each bicycle and for its rubber. The bike owner creates a certain amount of pressure based on the quality of the roads where he rides, or lack thereof. Not the least role is played by preferences when driving and physical training. The minimum and maximum pressure is determined by the supplier of the specific rubber.

The increased pressure in the wheels allows the cyclist to save energy. By improving the movement of the wheels, a person can lengthen or complicate his route.

The pressure exceeding the limit set by the manufacturer is the reason for the puncture of the chamber from the inside of the rim. The side of the rim where the spokes go and where the protective rubber tape runs will eventually break through the chamber with one of its side edges.

Below the lower limit pressure will result in chamber breakdown, or “snakebite”. It looks like two holes located side by side. The rim breaks through the camera in two places at once when the wheel hits an obstacle.

Wheels Must be inflated within the manufacturer’s specified pressure. In this case, the tire adheres perfectly to the road surface or to the road without any surface. The camera remains intact for many hundreds of kilometers.

The chamber pressure range is indicated on the sidewall of the tire. For example, mountain bike tires are labeled 1.95 inches wide. Inflate the wheel and measure the width of the tire using a ruler and two squares or a caliper. If the width matches the specified value, and the wheel feels elastic and hard, then you can ride. The width of the inflated wheel is not indicated on the camera. in this example, without a tire, it can inflate not to 1.95, but, say, to 2.1. When the camera already “sits” under the tire, the nipple itself takes on the load from the air expanding it from the inside.

The valve of the nipple. the spool. is reliable enough not to bleed air when the wheel of a stationary bicycle is inflated or when it is under working load during the ride. The pressure rating while driving is already taken over by the tire, not the chamber. The tire does NOT allow the tube to swell further. The tube is securely held by the tire due to the shape given to all rubber by the cord and the bead cable.

If the pressure is too low, the bike tire will sink under the weight of the cyclist. It clogs the camera, causing it to abrade, making it more penetrable. Excessive pressure at high speed will break the rubber when hitting a bump, stone, rails or crack across the road, when driving on overheated asphalt.

### 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 characters or the prefix “k” (kilo), we are talking about metric Pascal. Most often, the desired value is located under the size designations 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.

## Influence of pressure on ride quality

The correct tire pressure is a specific parameter for each bicycle and for its rubber. The bike owner creates a certain amount of pressure based on the quality of the roads where he rides, or lack thereof. Not the least role is played by preferences when driving and physical training. The minimum and maximum pressure is determined by the supplier of the specific rubber.

The increased pressure in the wheels allows the cyclist to save energy. By improving the movement of the wheels, a person can lengthen or complicate his route.

The pressure exceeding the limit set by the manufacturer is the reason for the puncture of the chamber from the inside of the rim. The side of the rim where the spokes go and where the protective rubber tape runs will eventually break through the chamber with one of its side edges.

Below the lower limit pressure will result in chamber breakdown, or “snakebite”. It looks like two holes located side by side. The rim breaks through the camera in two places at once when the wheel hits an obstacle.

The chamber pressure range is indicated on the sidewall of the tire. For example, mountain bike tires are labeled 1.95 inches wide. Inflate the wheel and measure the width of the tire using a ruler and two squares or a caliper. If the width matches the specified value, and the wheel feels elastic and hard, then you can ride. The width of the inflated wheel is not indicated on the camera. in this example, without a tire, it can inflate not to 1.95, but, say, to 2.1. When the camera already “sits” under the tire, the nipple itself takes on the load from the air expanding it from the inside.

The valve of the nipple. the spool. is reliable enough not to bleed air when the wheel of a stationary bicycle is inflated or when it is under working load during the ride. The pressure rating while driving is already taken over by the tire, not the chamber. The tire does NOT allow the tube to swell further. The tube is securely held by the tire due to the shape given to all rubber by the cord and the bead cable.

If the pressure is too low, the bike tire will sink under the weight of the cyclist. It clogs the camera, causing it to abrade, making it more penetrable. Excessive pressure at high speed will tear the rubber when hitting a bump, stone, rails or crack across the road, when driving on overheated asphalt.

## 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.

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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.

## What should be?

Pressure standards are different for each type of tire.

### For city bikes and mountain bikes

For a teenage or adult road (or mountain) bike with a wheel diameter of 24, 26, 27 and 27.5 inches, a pressure of 2.2-4 bar is considered optimal. But a road bike is capable of withstanding tire pressure up to 5 atmospheres. Exceeding this value will damage the rim on the first bump or blow up the camera after acceleration over 30 km / h, sharp braking. The wider rim holds the tube better than the narrower one. The more elastic the tire is, the more pressure it may need. And this does NOT mean that it will break with the maximum value.

Maintain a fine line between traction and rolling. Inflated to maximum pressure, the tire will roll very well. And yet, the grip will deteriorate sharply, since we are talking about a much lower speed. 5-30 km / h, not 30-50. With a pressure below 2.2 atmospheres, the tire will noticeably wash out. Crossing and cornering balance will also suffer. The very first bump, passed at high speed (from 25 km / h) will lead to a “snake” breakdown.

The narrower the tire, the more pressure it will need. The above values ​​for “mountain” and “road” tires are suitable for a cyclist weight of 80-85 kg. The heavier the rider, the more wear-resistant rubber he needs, since the extra weight of a person requires more pressure. For dirt roads, off-road and asphalt, adjustments are also made.

## Bicycle tire pressure: what should be and how to swing?

• Influence of pressure on ride quality
• What and how is measured?
• What should be?
• What to consider when pumping?

The quality of cycling depends on the inflation pressure of the tire. Insufficient compressed air pressure in the wheels leads to more frequent punctures and breakdown of the tube and tire. Excessive. to rubber abrasion. The optimal tire pressure can be determined based on your experience with proper cycling and manufacturer recommendations.

The norm for road bikes is 8-11 atmospheres (bar) depending on the specific tire, the weight of the bike and cyclist, average and extremely high speed. Here the general rule works: pumping up the pressure recommended by the manufacturer (maximum 0.5 atmospheres), you quickly and safely finish eating from point A to point B of your route. You are unlikely to be able to squeeze 10 atmospheres with a hand pump. Use a hand or foot pump with a pressure gauge. If your pressure limit is 9.5, then download 9 and drive safely at maximum speed.

All chambers gradually poison the injected air through their micropores. Part of it is also vented through the old nipple that has become loose from thousands of pumping. Rubber itself allows molecules and atoms of atmospheric gases to pass through: compare the molecular size of the vulcanized polymers (this is a long chain) of which the chamber is made, and the sizes of the nitrogen and oxygen molecules. The longer you use the same camera, the more intensely it poison the air. the gradual stratification, drying out of the rubber structure does its job. For example, in “KamAZ” wheels, pumped over due to congestion, eventually burst at full speed (one at a time, as the rubber resource depletes).

A road bike with 10 bars in wheels, running at 40 kilometers per hour and carrying a biker weighing 80-90 kg, undergoes the same. During the week, the working pressure in the wheels drops by about 1.5 atmospheres. Feel the wheel after a 300-kilometer marathon, you are unlikely to feel that it has lowered, but the pump pressure gauge (or car compressor) will immediately indicate this.

It inflates a bicycle wheel in a few seconds, and when the set pressure is reached, the automatic switches off the air blower. A bicycle owner’s own pump is not only a portable tool that allows you to inflate a wheel after a rubber repair. For cycling professionals, a pump is a tool that they use regularly, and often they have to. The lot of a sports bike is fast driving (up to 40 km / h), highway racing and a cycle track. Pumping its wheels below the average pressure will lead to an early breakdown of the chambers. Broken, cracked, rough, cracked and bumpy asphalt is an additional problem.

If you inflate the wheel of any bike 2-3 times higher than the maximum value, then this pressure is guaranteed to explode the tube with the tire after the first hundred meters of travel. But even if the rubber could withstand such pressure, the rim would easily get severe damage. “Top” pressure. cannot, at which the tire bursts, and then at which the wheel will break.

### For fatbikes

Fat bikes are best for riding on sand, snow and rocky roads. An example is winter driving on a road that is close to a railway embankment and is covered with a 10 cm layer of snow. The running zone of a fat bike tire is 2-3 times wider than in rubber for a mountain bike or city bike. The large contact area of ​​the tire with the road brings the fat bike closer to the wheels of the motorcycle. On a fat bike, you can freely ride on the off-road forests and fields. Pounds per square inch table of normal pressure values ​​adapted to riders with an average weight of 80 kg.

## 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 Near Maximum. Gives the bike speed and saves power;
• Pressure Near Minimum. Improves traction, 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 bumps in the road.

### Mountain bike tire pressures. Table.

The tire pressure of mountain bikes is adjusted according to the weight of the cyclist and the terrain you will be riding. The main indicator is the width of the tire, the wider the higher the pressure. It is rather difficult to bring certain values ​​\ u200b \ u200b, you need to try to find the golden mean yourself, in which the ride will be comfortable and fast.

 Cyclist body weight, kg Pressure, atmospheres (at) 50-60 2.4-2.9 60-75 2.9-3.2 75-85 3.2-3.7 85-100 3.7-4.0 100-110 4.0-4.2 110-120 3.9-4.1

## What pressure should be in bicycle tires

As a rule, the maximum allowable pressure values ​​are indicated on the side of the tires. For example, min 2.4 Bar (32 PSI). max 4.1 Bar (56 PSI). These numbers mean that the tire pressure must 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 riding on asphalt in poorly inflated tires, friction increases, and the cyclist’s speed is lost. When driving on a dirt road, contact should be maximized and therefore the tire pressure should be slightly above the minimum value. In addition, a slight pressure softens driving on bumps and off-road.

## 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 the topic of people in which there is an air shock absorber on the bike.

You DO NOT pump up 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 pluses, you clearly record the required tire pressure on the pressure gauge.

### 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,

Pa. Pascal.

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

And in other European countries they use the Bar label, because measurement is equated to “atmosphere”.

Rarely used in cycling designation Pa (Pascal).

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

## Tire care and repair to drive longer

Bicycle tires last a long time. Over time, the tire wears out due to tread wear. For tires to last a long time, you need to properly operate and store them. With a reduced pressure in the tire, destruction occurs, small cracks appear, the bending of the sidewall is deformed.

All this leads to faster tire wear. Uneven tread wear is affected by harsh braking. And it is also possible to shift along the rim during braking and rupture of the chamber in the region of the nipple. To avoid this, try to brake smoothly without sudden stops.

## Mountain Bike Tire

Not so long ago, such a story happened in my life. Seeing that I was pumping up the wheels of a bicycle, a boy of 10-12 years old drove up to me and asked me to swing the wheels on his bike. As a person who cannot refuse in such a simple matter, I connected the pump to his rear wheel. But before we had time to do even 20 pitching, we saw with horror how cracks went along the tires and it burst, and could not withstand the internal pressure of the chamber.

As it turned out, this topic is quite extensive and correctly inflated wheels will give the bike better handling and cross-country ability.

### Seasonal changes

With regard 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.

### Why maintain the correct wheel pressure?

There are several reasons to maintain the correct tire pressure:

• If you want to go fast. Increase the tire pressure;
• If you need good grip, set the tire pressure slightly above the minimum value;
• When the wheels are flat, there is a high probability of tire and tire damage;
• Never increase the pressure above the maximum allowable.

## How much pressure is needed to inflate the bicycle wheels

All modern tires indicate the maximum and minimum allowable pressure. There are two units of measurement. atmospheric pressure, measured in Bar (BAR) and pound-force per square inch (PSI). Pressure gauges usually show pressure in bars, if the tires indicate pressure in lbf only, you can convert them to Bars. 1 Bar ≈ 15 PSI.

The permissible pressure range for bicycle tires is usually within a couple of atmospheres. This margin allows you to vary the pressure, depending on the surface on which you plan to ride and your weight.

When driving on Rivne, decently asphalt, or on other hard surfaces, the pressure should be kept close to the upper permissible limit. If, while riding a bike, pay attention to the rear wheel, you can notice that the tire is squashed under your weight, due to which the contact surface with the asphalt increases, friction increases, and you will have to Apply significantly more effort to create the driving force.

However, the worse the surface, the less comfortable it will be to ride on poor surfaces. The density of the wheel will not allow you to damp bumps, so each bump will give off at the fifth point, and overload all bicycle systems. For this reason, when driving on unpaved surfaces, or bad asphalt, it is better to lower the pressure and maintain it in the area of ​​the lower permissible limits. This pressure will also allow for better traction. On poor surfaces, although this will create additional friction, requiring a lot of effort from the cyclist, however, it will allow maintaining the bike’s controllability in extreme situations.

For a beginner who DOES NOT know the features of local reliefs, all of the above can be taken into account and use a universal table. You need to pump up to the number of atmospheres corresponding to your weight, and you can already feel confident on the road.

Weight, kg Pressure, atm Pressure, psi
50 2.8 40.6
65 3.1 45
80 3.4 49.3
90 3.6 52.2
105 3.9 56.5
115 4.1 59.5