Bicycle tire pressure: what should be and how to swing?
Cycling performance depends on the inflation pressure of the tire. Insufficient compressed air pressure in the wheels leads to more frequent punctures and breakdowns in 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.
For road bikes
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 manufacturer’s recommended pressure (maximum 0.5 atmospheres), you will quickly and safely reach 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 upload 9 and drive quietly 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 been loosened from thousands of pumping. Rubber itself allows molecules and atoms of atmospheric gases to pass through: compare the size of the molecule of the vulcanized polymers (this is a long chain) of which the chamber is made, and the sizes of the molecules of nitrogen and oxygen. The longer you use the same camera, the more intensely it poison the air. gradual stratification, drying out of the rubber structure does its job. For example, KamAZ wheels, pumped over due to congestion, eventually burst at full speed (one at a time, as the rubber resource is depleted).
A road bike with 10 bars in wheels, traveling 40 kilometers per hour and carrying a biker weighing 80-90 kg, undergoes the same thing. During the week, the working pressure in the wheels drops by about 1.5 atmospheres. After feeling the wheel after a 300-kilometer marathon, you are unlikely to feel that it has lowered, but the pump (or car compressor) pressure gauge will immediately indicate this.
If you do not have your own pressure gauge at hand, you can pump up the wheels of a bicycle at any service station for free 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 even forcedly. The lot of a sports bike is fast driving (up to 40 km / h), racing on highways and cycle tracks. Pumping its wheels below the average pressure will lead to a quick breakdown of the chambers. Broken, cracked, rough, dry and bumpy asphalt is an additional problem.
If you inflate the wheel of any bicycle 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 be severely damaged. The upper pressure is not the one at which the tire bursts, but the one at which the wheel itself breaks.
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 can withstand tire pressure up to 5 atmospheres. Exceeding this value will damage the rim on the first bump or explode the camera after acceleration over 30 km / h, sharp braking. A wider rim holds the tube better than a narrower rim. 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, and 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 traversed 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.
What should be?
Pressure standards are different for each type of tire.
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 none at all. Riding preferences and physical fitness play an important role. 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 band runs will eventually break through the chamber with one of its side edges.
Below a lower pressure limit, the pressure will lead to a breakdown of the chamber, or a snakebite. It looks like two adjacent holes. The rim breaks through the camera in two places at once when the wheel hits an obstacle.
The wheels must be inflated within the pressure specified by the manufacturer. In this case, the tire adheres perfectly to the road surface or to the road without any surface. The camera remains unharmed for many hundreds of kilometers.
The chamber pressure range is indicated on the sidewall of the tire. For example, a mountain bike tire says 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 is already sitting 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, and not by the chamber. The tire prevents the tube from swelling even further. The tube is securely held by the tire due to the shape given to all rubber by the cord and bead cable.
If the pressure is too low, the bicycle tire will sink under the weight of the cyclist. It blocks the camera, causing it to abrade, making it more penetrable. Excessive pressure at high speed will rupture rubber when hitting a bump, stone, rails or crack across the road, when driving on overheated asphalt.
In what and how is it 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 measure. Bar. too, but it is firmly associated in the memory of people 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.
Fatbikes are best for riding on sand, snow and rocky roads. An example is winter movement 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 that of 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 off-road forests and fields. The PSI chart is based on a rider with an average weight of 80 kg.
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.
Despite the recommendations of the manufacturers, such a parameter as the pressure in the wheel chamber is a matter of personal preference. Each cyclist adjusts this parameter for himself, for the track on which he is going to ride, for his personal riding style and level of technical training. Therefore, how much should be pumped up, everyone decides for himself. Every experienced rider knows a number of factors and operates with them:
- The rider approaches the parameters to the maximum if he wants to add speed to the bike while riding and at the same time save his strength.
- The cyclist approaches the minimum value for better traction.
- Low inflatedness helps smooth out minor bumps in the road while driving.
- Over-inflated tires will lead to tube breakdown on the rim.
- Under-inflated tires will also cause tube damage from snake bites.
How riding style and tire pressure depend.
When a cyclist trains on relatively flat asphalt roads, country and forest dirt roads and paths. For this style of riding, I prefer to pump the wheels up to 3.5-4 atmospheres. Such a high bar value allows you to achieve good speed characteristics, high rolling, but when it hits bumps and stones, the fifth point immediately feels all the unevenness of the road surface.
For those who like walking at low speed on the flat roads of parks, 2.5-3 atmospheres will be enough. On the Internet, you can often find recommendations to pump 2-2.5 bar into wheels, this is justified only for tires at least 2 inches wide and subject to driving over rough terrain or poor coverage. Low pressure increases traction and comfort, but reduces roll on flat pavement. You should not ride at a pressure less than 2 atmospheres under any circumstances.
The choice of the terrain, on which you prefer to ride, obliges you to choose a certain type of tire, but in general, if you have a universal tread, you can make your ride comfortable on a particular type of road surface by changing the amount of atmospheres on the wheels. The figures below are based on a standard 2-2.1 ″ tire.
For gravel, mud, grass, sandy surface, it is better to pump up to 2.5 atmospheres, which increases the adhesion of the tread to the ground and allows the wheel to smooth out all the irregularities of the road surface well enough.
For flat asphalt tracks, feel free to use a pressure of 3 bar or more. However, there is one but. If you have a fairly bald tread (wheels with a weak relief or slick tires), and you are driving at high speed on wet or even wet asphalt, then you risk slipping (flying out) when cornering. If it rains on the road, just slow down or slightly deflate the tires.
This article describes the most acceptable criteria for choosing tire pressure, but since each person independently selects the most convenient pressure values, I advise, first of all, when mastering a bicycle, experiment.
For children, it is better to inflate the tires to the maximum allowed value. This will make it easier to learn to ride a bike, as well-inflated wheels have less contact patch and the driver has to put in less effort.
Manufacturers indicate the recommended parameters on the side of the tire. Usually they are in the range of 35. 60 psi (2.38. 4.08 atmospheres). But still, this is a parameter that is selected purely individually. Therefore, there are a number of recommendations that are considered common to all people.
- The high pressure increases the roll rate. the cyclist saves energy, and the rolling speed increases.
- Excessive, as well as too little pressure in the wheels (both in the front and in the rear) of the bicycle can cause the rim to burst the chamber from the inside.
- Low pressure prevents vehicle mechanisms from breaking when driving in holes, and also provides better traction when driving over rough terrain.
Important! With poorly inflated bicycle tires, the tire will move to the rim, wringing the tube. This will deform the wheel.
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.
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.
How and how much to swing the wheels on a bicycle?
A Few Tips to Consider When Inflating Bicycle Tires.
Correct tire pressure will allow the bike to roll quickly, smoothly over bumps. Narrow tires need to be pumped harder than wide ones:
- On-road models typically pump between 80 and 130 psi (5.5. 9 bar / atm)
- Mountain 30-50 psi (2. 3.5 bar / atm.)
- Hybrid 50 to 70 psi (3.5 to 4.8 bar / atm.)
To find the ideal pressure, first inflate the average of these ranges and then adjust for the rider’s weight factor. The higher the weight, the higher the pressure should be, within the indicated ranges. For example, if a road bike, a rider weighing 75 kilograms, pumps 100 psi (7 bar / atm.), Then for a 90 kilogram athlete, 120 psi (8.2 bar / atm.) Is needed. Accordingly, for a rider weighing 60 kilograms, 80 psi (5.5 bar / atm.) Can be pumped. At the same time, you should never inflate tires above or below the indicators recommended by the manufacturer.
Recently, after numerous tests by various manufacturers and specialized publications, athletes have revised the dimensions and pressures of their tires. Many riders started using wider tires without pumping them to their limits. Analyzing such studies, it became clear that 25mm tires were more efficient than 23mm tires. And in some cases 27mm rolls better than 25mm. A separate article on www.triskirun.ru will be devoted to this topic. The optimal pressure to inflate a 27 mm wide tire is a range from 6 to 7 atmospheres with a rider weighing 60-70 kg. Tire size 25 can be inflated 0.5. 1 atmosphere more.
For a long time, many have reiterated the old belief that higher tire pressure contributes to good roll-off, providing low rolling resistance, as a result of creating a smaller contact patch on a smooth surface. It should be noted here that not one highway is perfectly smooth. A properly inflated wheel should handle bumps and damp. An over-inflated tire reacts harshly to all shocks and bumps, which affects speed and comfort. So it turns out that on good, smooth asphalt, the same tires roll well at 100 psi (7 bar / atm.), But on an old bumpy road with numerous cracks, they perform better at 90 psi (6 bar / atm.)
In rainy weather, the pressure can be further reduced by 10 psi (07 bar / atm.) To improve wet grip.
A medium-weight mountain biker who winds his kilometers off-road needs 50 Psi (3.5 bar / atm.) For even and smooth ground, and 38 psi (2.6 bar / atm.) For a rocky singletrack with roots will be more optimal. ).
With tubeless tires, you can use low pressure and are not afraid to puncture the wheel due to the lack of a tube. But here, there are peculiarities depending on the technique of owning a bicycle. It should be remembered that it is better to jump over or handle irregularities in the form of stones and logs so as not to damage the rim. A rumpled rim against stones will cause air loss in the tubeless system.
The compressed air that is trapped inside the tires constantly strives to leave its chamber. If you drove over glass or small stones, immediately wipe the surface of the tire with a gloved hand (not bare fingers), removing adhering debris.
For maximum puncture protection, you can use protective tape, as well as tubeless tires or latex tubes, which are less susceptible to damage. Be aware that tubeless wheels are also available for road bikes. Recently, silicone sealants have gained great popularity, which work well for all types of wheel systems: tubeless, tube and bicycle tubes.
Try to avoid breaking through the camera when driving over bumps. Step on the pedals, press down on the bike in front of bumps, and then sharply pull it up behind the handlebars, at the time of the move, then releasing the pressure on the pedals moving the center of gravity forward, thus smoothing over the obstacle, reducing the impact on the wheels. But the best solution is to learn how to jump over obstacles.
For every 10 degrees lower temperature, the pressure in the chambers drops by 2 percent. If the temperature drops from 30 to 15 degrees, then the tire pressure will decrease from 100 psi (7 bar / atm.) To 94 psi (6.5 bar / atm.). Even half the atmosphere can be felt and is worth paying attention to.
Make it a rule to check the tire pressure before every ride.
In general, you need to be careful with wheels.
In the car, I usually swing 3 atmospheres forward, 2.8 backward. This is my specificity, not everyone loves it so much (99%), because it’s hard to drive, especially with a stiff sports suspension.
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Than it is good?
The contact patch with asphalt / ground is reduced. As a result, I need to spend less energy to maintain the speed of the bike. Also, the wheel tread strongly influences the reduction of rolling resistance. On road bikes, it’s a slick. It is narrow, minimum contact patch, minimum rolling resistance, best efficiency.
On mountain bikes it is fashionable to put toothy rubber. Her grip is just excellent. But if you drive it on the asphalt, it automatically turns into a semi-slick at the end of the season. the central teeth are ground.
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Therefore, it is easier to immediately take a normal semi-slick for a mountain man, if you are not extremely racing. I have been evaluating the places of my movements for a week, I realized that I am not going to get into mud / swamps / clay / sand. but I will drive on asphalt / primers. and I took myself a semi-slick. Very satisfied.
In the spring, I measured the efficiency between the toothy Kenda and the half-slick Schwalba, at the same pressure, at the same temperature and weather conditions. It was still time to change winter for summer. I walked the same distance 15% more economically on the Schwalbe (measured by the number of calories) and the average speed was 20% higher.
How much to pump into the bike?
Since I swing into the wheelbarrow all the way. at first I rocked all the way into the wheels of the bicycle. Those. if the top bar of 145 psi (10 Bar) is written on the cameras of the Vittoria Zafirro Pro road bike. I stuffed so much there.
Mountain bike. Schwalbe CX Comp with a maximum of 65 psi (4.5 Bar). I stuffed so much there too. And he drove. You can experiment. Leave about 0.5 atmosphere in the wheel and try to ride on the asphalt. You will immediately feel that the wheel simply does not move and on the asphalt the same sensations as on the sand.
I pumped 7 atmospheres and went to workout
Cameras, by the way, are constantly being lowered. On a mountain bike. smaller, on a road bike. more. The thinner the chambers, the more air oozes out of them. There are very light and thin latex chambers. they hold pressure in general for 1-2 days. I spend 1 atmosphere on MTB in a week, on a road bike. 1 atmosphere in 2 days.
This time I decided to swing at the minimum bar. 7 atmospheres. I called Fedor. but they took him for potatoes. and I drove alone in a 60 kilometer circle.
I don’t know what played a big role. Maybe I was shaking less. Perhaps I recovered normally (2 days), maybe there was not a very strong wind (13 km / h), maybe the weather was cool (17 degrees). But as a result, I set the record for the best time on a section of 40 km.
Now I have stopped at this pressure. 7 atmospheres for training. Let’s see how they say.
By the way, if you leave 3 atmospheres on a mountain bike (instead of 4.5), then the rear wheel begins to bounce disgustingly (like a ball) and kick in the fifth point
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It is important to consider the load on the bike from the rider’s own weight, especially the fact that most of it is on the rear wheel. Therefore, the degree of its pumping should be slightly higher than the front, the optimal difference is 10%.
To calculate what the optimal pressure should be in the tires of a bicycle, taking into account the weight of its rider, you can use the table:
Cyclist weight (kg) Pressure (atmospheres) Pressure (PSI)
|50-60||2.4. 2.9||34.81. 42.06|
|60-70||2.9. 3.2||42.06. 46.41|
|70-85||3.2. 3.7||46.41. 53.66|
|85-100||3.7. 4.0||53.66. 58.02|
|100-120||4.0. 4.||58.02. 59.47|
Tire inflation will directly depend on the rider’s weight. The larger it is, the more atmospheres need to be pumped into the bicycle wheel. However, you should always remember that overloading the bike with simultaneous pumping of the wheels can lead to a twisting of the rim into a figure eight or a tire burst.
Tire type and rubber surface
The type of tires is determined by the surface of the track on which the cyclist will mostly ride. Accordingly, the inflation rate of the bicycle wheel will be different. There is a direct dependence on the roughness of the tread and the width of the wheel. the more lugs and the wider the wheel, the lower the pressure should be. Empirically, cyclists quickly determine how much atmosphere should be in their bicycle tires.
Why you need to know tire pressure information
Many cycling enthusiasts believe that inflating the wheels is necessary only for a good roll of the bike. However, lowered wheels have a wider area of contact with the road, which means that grip will be better, but it will be very difficult to accelerate to a speed of 30-35 km / h on such tires.
When inflating your wheels, you should always consider what kind of terrain or surface you will be driving on. If you are going to walk on an asphalt road, the tire pressure of the bicycle should be close to the maximum allowable value. Resilient wheels on a flat surface will provide smooth roll and high travel speed.
For riding on rough terrain with unpaved paths, it is better to set the pressure in the bicycle tires to a medium allowable so that you can easily ride long distances in comfort and convenience. At high pressure, the grip of the wheel with the road will be minimal, respectively, all pits, stones, irregularities on the road will be sensitive. And with flat tires, the likelihood of wheel damage or tube puncture increases.
To protect yourself on the road, as well as to keep the bike or its individual parts intact, you need to know exactly the lower and upper limits of permissible values to what pressure the bicycle wheels can be pumped.
Tire pressure information gives you the advantage of cycling:
- an overly inflated wheel is prone to bursting or puncture about the rim, especially at high speed;
- too little pressure can cause a tire breakdown in the form of a snake bite when hitting even a small obstacle;
- reduced pressure softens bumps on the road, increases damping properties;
- pressure is normal at the lower limit, increases traction in off-road or rough terrain;
- normal pressure at the upper limit, in conditions of an asphalt road, gives a high speed, while saving the cyclist’s strength.
Dependence of pressure indicators
The pressure in the wheel is held by the tire, not the tube, so there is no single standard for its value. There are several significant factors that determine how much wheel pump a bicycle needs.
Many cyclists do not think about the fact that the air temperature affects the pressure level in the tires of the bicycle. From the course of school physics, we recall that when heated, bodies expand. This means that in hot sunny weather, the pressure inside the air chamber will increase without additional pumping. Conversely, on cold winter days, a drop in tire pressure due to low temperatures is quickly felt. This means that when going on a bike ride in the cold season, the pressure indicators need to be adjusted slightly higher than usual, and in the summer heat, bleed the air a little. It is worth noting that when going to bike rides, you always need to take into account the weather conditions.
Bicycle tire markings
On the sidewall of the tire, manufacturers indicate how many atmospheres to swing the wheels of the bicycle. The range is indicated within which the owner of the iron horse determines the desired values, depending on the specific factors of riding his bicycle. Values in the range are labeled from min to max, in two or all three dimensions. Numbers up to 10 are atmospheres (or BAR), tens-hundreds are PSI, and six-digit values or with the prefix k / kilo are Pascals.
When inflating a wheel, you must strictly adhere to the manufacturer’s recommendations and try not to go beyond both the minimum and maximum pressure levels indicated on the tire. over, it is better to leave a small margin of 0.2-0.5 BAR, both in one direction and in the other direction, so that the tire does not burst.
The nature, riding style and type of bike also affect the level of tire pressure. Active shoppers often opt for 26-inch mountain bikes that can ride well on city streets and off-road.
To understand the pressure to inflate the wheels of a bicycle, it is necessary to take into account the peculiarities of both the bike itself and other, at first glance, weightless factors. For example, tire weaving, rim thickness, driving style. The likelihood of a tire falling off a wide rim is much less than a narrow one, because a wider rim will hold the tire better than a thin one. A mountain bike, by its very name, suggests the presence of a difficult surface on the track, with possible obstacles and irregularities. Driving style is more aggressive than on a flat, calm trajectory, obliges to increase the tire pressure to a level slightly less than the upper limit.
The diameter of the wheel will also affect the selection of the optimal pressure value, since the larger it is, the higher the volume of pumped air will be. However, for mountain bikes it is not so important whether the wheel diameter is 26 or 29 inches, much more attention needs to be paid to the parameters of the cyclist’s weight and the type of track.
What pressure should be in bicycle tires
When buying a bicycle for themselves, many will not even think about the fact that the convenience and comfort while riding it is achieved by correctly selected tire pressure. How inflated the wheels affect the life of the bike, the riding speed, the degree of tire wear, safety, control of the two-wheeled friend.
The Right Pressure. Why It Matters?
Tire pressure has 2 main factors on which the correct operation of your tires depends. hook and roll.
The larger the area of your tire in contact with the surface on which the wheel is rolling, the greater the percentage of rubber tread engagement for this very surface. This means that a heavily inflated wheel has a smaller contact area and only the center tread is in contact with the surface. Likewise, a low-pressure wheel is pushed more strongly under the weight of a bicycle and a cyclist, thereby the wheel comes into contact with the surface not only of the central but also of the side protector.
Low pressure is most often recommended in wet weather and on loose soil. Here, the rules for choosing pressure and grip are almost identical to those followed by motorcyclists and motorists. Another plus of low pressure is that by lowering the pressure, you increase the cushioning due to the soft rubber and thereby increase the degree of comfort when traveling. However, do not forget an important fact. low tire pressure increases the chance of breakdown (the so-called snake bite, when the chamber breaks through in two places) and damage to the rim.
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.
The optimal level of atmosphere in bicycle tires is determined independently and depends on the riding style, characteristics of the road and professional training.
High tire pressure increases roll, speed and saves the rider’s energy.
Pressure exceeding the recommended standards is fraught with a puncture of the bicycle tube on the inner surface of the rim ring.
As a result, the chambers are filled with enough air to ensure traction, but do not damage the bike. There are standard parameters for defining acceptable boundaries for all types of cameras.
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.
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.
Cameras or tubeless?
When choosing the optimal pressure, you should pay attention to how your wheels are assembled. on tubes or tubeless. Tube wheels, which have traditionally been used for many years, have a high risk of puncture or rupture at low pressure. This happens when, under external influence, the tire presses the tube too hard against the rim and damages it either with a spoke, or squeezes between the edges of the rim and makes 2 symmetrical holes. With this in mind, sometimes you have to use a slightly higher pressure, which ultimately affects the pressure.
The problem of breakdown at low pressure can be solved by installing the tire tubeless. Instead of a camera, special sealed nipples are installed in the wheel, a special adhesive tape is mounted around the rim, a special tire is snapped onto the rim and snapped onto it, and a sealant is poured through the nipple. Since there is no camera, this assembly can be used for low pressure driving without fear of puncture. If the tire is damaged in some way, then the sealant inside the tire quickly seals the cut. Among the disadvantages of a tubeless camera, you can list the need to install a camera in the event of a severe cut, when the sealant is not able to cope with a puncture or cut from glass or stone, as well as the limited shelf life of the sealant.
If we talk about installing a road tire, then here it is also possible to install it with and without a camera. A tire fitted with a tube is called a clincher. Its installation is no different from analogs that are installed on mountain bikes. Tubeless tires are called tubes. Their installation is carried out by gluing the tire to the rim, the sealant is not poured inside, so in case of a puncture it is necessary to sew up the tire and re-glue it to the rim.
Influence of ambient temperature on pressure
If you ride a bike, both summer and winter, then you should definitely know that the ambient temperature will also affect the tire pressure on the bike.
When driving in the summer, we recommend that you inflate the wheels a little less than the maximum value indicated on the tire by the manufacturer. In summer, at a high air temperature, the asphalt heats up and when the tire friction against it, the air in the chamber heats up, which leads to an increase in air volume and, accordingly, an increase in pressure in the tire. In summer, an over-inflated tire can even burst, and the tire tread wears out faster.
In winter, a lot depends on the surface of the road on which you have to drive. When driving on rolled snow on studded tires, the tire pressure should be kept closer to the maximum value, but if you need to drive on loose snow, then, for better grip, the tire pressure should be around the average value.
It is worth remembering that in winter, when pumping the wheels in a warm room, you need to pump more than necessary, because in the cold the pressure in the tires of the bike will decrease.
What do the numbers on the tire mean??
If you find 2.5-4.1 on the tires, it means pressure in Bar or atmospheres. If 90-140 is clearly Psi. But if the numbers are three-digit and next to them is the number k, for example 280-360 kPa, then this is Pascal. Typically, the values are duplicated in at least two dimensions, and the responsible manufacturer applies the data in all three dimensions.