# How Much To Pump Bicycle Wheels 29

## Bicycle tire pressure

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

1 atmosphere = 14.696 psi

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

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

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

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

Tire volume and pressure are inextricably linked. The volume of the tires determines how a certain pressure appears to you. For example, a 700x25mm tire inflated to 2.38 atmospheres per square inch will be practically flat, while a 26×3.8in tire inflated to the same 2.38 atmospheres will feel firm to the touch. the wheel will bounce on uneven surfaces, rather than 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.

1.) Primer, potholes. inflate to an average value (guided by the readings on the tire) or slightly less.

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

Your riding style is just as important as the terrain you are driving. The more aggressive the driving style, the more the wheels need to be inflated. Are you trying to choose the flattest sections of the track, bypassing bumps, 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 compromising efficiency. A wide rim holds the tire better than a narrow one. It allows you to use lower tire pressure without sagging.

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

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

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

An insufficiently inflated tire 28. 32 psi (1.9. 2.17 atmospheres) is also fraught with danger. Because of this, you can easily punch through the camera by hitting a stone or simply hitting an uneven track. With this shock load, the chamber is clamped between the rim and the obstacle, which can cause a “snakebite”. It will be difficult to fix a puncture of this kind. There is also a high probability of damage to the rim itself, this can entail expensive repairs or even replacement with a new one. It should be borne in mind that a badly inflated tire on a steep bend can be “ripped off”, and this can cause a fall. Most often, a stall occurs on the front wheel and is accompanied by a loud bang of the camera, as it easily bursts, having lost the tire protection.

Attention! Do not exceed the pressure indicated by the manufacturer on the tire sidewall!

We recommend:

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

Road bike wheels should be inflated to 95-135 psi (6.46. 9.18 atmospheres), as the air volume in them is less than in mountain bikes.

## Niner. The truth about cycling since 29″ wheels

Niner (also tu-niner). the mountain bike category with 29-inch wheels instead of the standard 26-inch, evokes different emotions. Their opponents think they look like clown stories (or even old people). But most opponents of big wheel bikes spent very little time on them.

## Bike wheel size matters

Long ago in 1986, Dr Alex Moulton, known for his comfortable bikes with small wheels, created an all-terrain bike with 20-inch wheels. Unfortunately, Molton’s bike had a fundamental flaw in its design. The 20-inch wheels on this bike were overly sensitive to every hole and branch in the ground, which were barely visible to 26-inch wheels. So despite the convenience and suspension adjustability of Molton’s bikes in a time when most mountain bikes were rigid, the new bike was not in demand.

If you’ve ever ridden a BMX bike on a serious mountain route, you know it’s not a very pleasant feeling. Small wheels as well as a smaller wheelbase result in more difficult handling on uneven roads. Think about it. All other things being equal, a larger wheel diameter smooths its trajectory along uneven terrain. But can we also say that larger wheels will go faster on uneven surfaces? Not always, difficulties arise due to the fact that the statement “other things being equal” not performed and other features must be taken into account.

Have you already caught up with a rush of interest in niners? Think about your preferred riding experience before choosing.

Let’s take a suspension. In theory, all of its components, including the thick tires, are designed to make the perception of the ground smoother. But suspension installation on 29 “wheels is more difficult than on 26″ wheels. Without changing the frame, there is no room to install the desired components. Therefore, larger wheel sizes require a change in the frame geometry in order for the bike to perform at its best.

Larger wheels and tires also weigh more, so they don’t accelerate as quickly. Although they roll more easily over rectangular pits, they do not accelerate as quickly when moving down. Smaller wheels are easier to accelerate to normal speed, but larger rims maintain speed better. Next, we will move on to a more detailed consideration of the features of the frame geometry, but it is already clear that large wheels roll more smoothly on the surface, but this does not mean that they are definitely better, other features must be taken into account.

## How big can they be??

The mountain bike market is now dominated by 26-inch models and it’s understandable why. They are a good compromise for medium build riders for bumpy traction on thicker tires. They fit into a regular frame and stuffing dirt into the gaps is not a big problem.

For the inexperienced: mountain bike wheel size. this is the approximate diameter of the tire and wheel. But tire height can vary, so it is rare for a wheel and tire to be exactly 26 inches in diameter. Large tires with a thick tube can be 27.5 inches in diameter and may not even fit in a regular fork or in between typical chainstays.

The indisputable fact that the rider on the niner looks small and some people don’t like it.

In fact, fitting a high-profile tire to a 26-inch wheel gives an idea of ​​how a 27.5-inch (size 650B) wheel would feel when fitted with a regular tire. The 27.5 “size is midway between 26” and 29 “, some would say it is the ideal solution for normal mobility with a softer roll.

27.5 “wheels can be made lighter and stronger than 29” wheels and the frames tend to look tidier than 29 “(high ground clearance) wheels, which look awkward. There is no doubt that 29- and 27.5-inch bikes, if more rims and tires are available, are good choices for those looking for a smoother ride, especially without a suspension fork. Undoubtedly, for tall riders this bike is a better choice.

26-inch wheels will continue to dominate the market in the near future for mid-size bikers, but 29ers are definitely making a quiet revolution in popularity. Now we’ll take a closer look at why larger wheels are increasing in popularity.

## At the beginning

When the 29ers first started mass production, they immediately showed their capabilities, but the difficulties immediately manifested themselves in the form of a limited choice of suspension forks and frame geometry, which was mostly copied from 26-inch models.

Gary Fisher released the Genesis, whose dimensions were promising, but it wasn’t until the last couple of years that designers really began to understand the difference between the ideal geometry of 26 “and 29” bikes. This does not only apply to the selection of frame corners. Fork length, stem, top tube and bottom bracket all have an impact on overall stability and cycling feel.

And we haven’t yet started to consider the advantages and disadvantages of longer chain stays, a larger wheelbase, and how tire-to-ground contact affects wheel-to-ground traction. Considerations about these issues for 29ers are still changing, as are opinions on the same issues for regular 26-inch bikes.

Cross-country riders switched to 29ers to drive through sections previously inaccessible to travel.

People who have switched to 29ers seem to love them for being able to drive faster on uneven terrain. The riding benefits of large-wheel bikes may not translate into a measurable increase in overall speed when riding a cross-canry circuit for high-end pro riders, but the more we ride them, the more we are convinced that the best riders can get noticeable comfort and precision on the bike with cross-country driving.

And keep in mind that increased control comfort and precision usually means faster speed, thanks to the psychological comfort factor. This may be the reason why some of the smallest women in the XC World Championships did the best on 29 ” bikes. There are situations in which the niner is easier to operate. But first, let’s hear what people have to say comparing 26 and 29 inch bikes.

## How wheels are measured?

Basically, 26 and 29 inches refer to the edge-to-edge diameter of the tire (a rather rough measurement because tire size can vary). High profile tires fitted to a 26 “wheel can produce 27” or more. High-profile tires will result in smoother wheel rolling than low-profile tires and thus provide more comfort as well as the benefits of better grip on larger wheels.

An intermediate option that is harder to find, the 650B comes in an edge-to-edge dimension of 27.5 inches, which will fit in some frames and forks for 26 “wheels. Some fork manufacturers do not change the height of the arch, so you can choose to fit the high profile 26 ” or 650B wheels into the same fork.

## Why the wheel rolls more smoothly?

The main reason a larger rim rolls more evenly is the angle of curvature. Try rolling a gymnastic hoop over an uneven surface, and now do the same with a napkin ring. Of course, there are other differences, but you get the main point.

A large wheel with a smaller angle of curvature is less affected by bumps and valleys because it travels over the tops of valleys that have hard edges. This is why it is harder to roll down stairs on a BMX than on a mountain bike. Completing the logical reasoning, we can come to the conclusion that it is possible to create such a large wheel that it will ride along the hard edges of the steps without feeling the depressions, as if along a smooth descent.

26 inches versus 29 inches, a small difference, but a noticeable change in the sensation of driving on the highway.

If a rider sits on a 26 “bike and then on a 29” bike with the same tire pressures, the theoretical size of the pad that grips the ground should be the same. But even with tires from the same manufacturer and the same tread, the difference in volume and shape will give a larger contact area for a 29-inch wheel.

There are many factors to consider. A typical 29er will feel more stable than a regular 26-inch bike. In particular, thanks to a longer wheelbase and a longer rear end to leave enough room for a larger wheel. It looks like it can be done on a regular bike, but this is rarely done.

Another reason for stability is that although the wheel axles are 1.5 inches higher on the 29ers than on 26-inch wheels, you sit lower between the wheel axles on the 29er compared to a regular bike. Therefore, despite the fact that the bike with large wheels itself has a center of mass higher than the 26-inch bike, the 29er with the rider on board is more stable, because the full center of mass of the bike with the biker is lower.

In terms of how geometry affects handling, designers have enough ways to consistently tackle this issue. They can change the front fork clearance (to change the front wheel offset), the fork travel, so that the niner feel is at a level. With more and more decent forks hitting the market, this process has already gone a long way to correct the misconception that 29ers will perform badly on tricky trails.

The main reason for the popularity of niners. less curvature of the trajectory of movement on uneven terrain, so rocky surfaces are less difficult.

### Why not all racers use 29ers?

In the US, the women’s and men’s cross-cut marathon racers won in 2009 and 2010, and some of the Trek team’s riders began to achieve better results when they switched to 29ers. Todd Wells won the US Championship twice in his Specialized Epic Full Suspension Niner 2011 in July. Riders such as Willow Koerber and Heather Irmiger have also shown that bikes with large wheels are also suitable for short riders.

Accident? Maybe, but look at the results. It appears that XC racers’ overtly conservative stance on bike design is changing, even if it may be prompted by sponsorship.

### Who are 29ers best for??

Many companies are experimenting with big wheels on downhill bikes, many XC racers are using them, is this the result of marketing pressure or are 29ers really better than 26-inch bikes for some riders? We considered most of the controversial issues and came to the conclusion that this is a situation in which everyone should do their own thing.

Riders who feel more confident from a softer 29er ride on uneven surfaces may ride a little faster as a result. But those who are concerned about a slightly longer delay in instantaneous acceleration may end up with less speed. Ultimately, this is determined more by personal preferences and feelings than it is manifested in an objectively noticeable increase in speed.

### What the experts say.

We interviewed a sample of our test riders and some industry insiders to find out their views on the performance comparison between 26 “and 29” bikes. Here’s what they told us.

“Niners bring some notable benefits, but also some complexities related to frame, fork and bike component design. A larger diameter naturally gives more mass and moment of inertia, more wheel deflection and longer, more flexible frame tubes. But innovations such as a wider hub and spokes on the flange, wider (and therefore stiffer) lighter rims and a bolt-on hub axle have brought the performance off the ground with conventional bikes. Some manufacturers, such as Specialized, have made a determined effort to incorporate all three features into their Epic Carbon.

The tires of the niners should also be different. Tests carried out by the Finnish company Wheel Energy have confirmed that a tire on a 29 “tire has a tighter contact surface than a 26” tire. Consequently, the spikes on the edges of the tread can cling to the surface on one wheel, but not cling to the other, plus a 29-inch tire may have more spikes in the center of the tire than a 26-inch tire, depending on the design.

Just using what we know about 26 “bikes and component design on 29″ bikes gives an acceptable result, but you need to think a little differently to achieve real benefits. If we have to come to terms with the inherent disadvantages of niners, we can also fully exploit their potential advantages. When we do this, we will see a further increase in their popularity.”

Mike Hall, Design Engineer.

“When I first heard about niners, I rolled my eyes, shook my head and thought: ‘These crazy seekers of new niches, what else will they come up with?’. My opinion, which arose without any tests, that this is a nonsense idea, was reinforced when I saw a 29er with a short racer. ‘If it’s a cool new thing. leave it to yourself, ‘I thought then. My opinion was based on the fact that it looks awkward.

And imagine my disappointment when they started to gain popularity! I felt uneasy. When I looked at them again, I saw an elegant beauty, although I had previously only seen a terrible frame with a short front tube and awkward proportions. On the other hand, perhaps the designers have found the right design language for them.”

John Stevenson, Chief Editor of the Future Publishing Cycling Section.

“Excessive fashion for niners is overloaded with turmoil and confusion and does not correspond to reality. Indeed, in theory, large wheels roll faster. But that difference is lost in a variety of other factors that affect bike speed. Other benefits that are talked about are either fictional or can be achieved on 26-inch bikes. For example, 29 inches suits tall riders because large wheels result in longer chain stays and a longer wheelbase, resulting in a more similar weight distribution to what happens on a 26-inch bike with a medium-sized rider. You just need to lengthen the 26 ” bike.

The claim that a 29-inch wheel has more surface contact and better grip is not based on a physics misunderstanding. If your whole bike is 180 pounds and your tire pressure is 30 pounds per square inch, distribute your weight over the surface and you will have six square inches of tire on the surface, regardless of tire size. Larger wheels are said to be more stable because they have more moment of inertia. But tests have shown that moment of inertia makes little difference in stability. The most important is the fork drift, depending on the angle of inclination of the front tube of the frame and the clearance of the fork.

The variety of choices is great, so if you like your 29er, ride it and have fun. But don’t talk about its technological benefits. race results and physics say the opposite.”

“I no longer consider myself a serious cross-country racer. If I were him, I would undoubtedly ride the Niner all the time. Now, I use three bikes, all of which are great for the season.

One of them is a niner, it has a rigid rear suspension. It is aluminum and is designed for high-speed driving. Its weight is less than 23 pounds, i.e. light enough, so there is no difficulty in climbing or accelerating with it. After owning this 29 ” bike for over a year (and not just temporary testing), I can confidently say that there is no reason for me now to use a bike with 26 ” wheels and a rigid rear suspension for mountain riding, any kind of speed or walking.

My second bike is 100mm travel, full suspension. I usually choose it for cross-country competitions, not because it is faster than a niner, but because I like to ride it better. It weighs more than a 29er with a stiff rear suspension and therefore does not easily climb a hill. However, from what I saw driving off the mountain in 2011, I think it might be time to sell this bike with larger wheels.

Finally, my third bike has 150mm of suspension travel, is relatively light and is more designed for a more enjoyable ride than speed. It has 26-inch wheels with large tires and is the most enjoyable to use, but the slowest uphill. For him, I see no advantage in using larger wheels. They add a little more weight and given the suspension travel, I did not experience any difficulties with traction on it.

The moral of my story is that if you have more than one bike, there is room for at least one niner in this set. For those whose goal is not to compete in cross-country competitions in the company of friends or official competitions, I think large wheels will give a serious advantage.”

Oli Beckingsale, cross-country pro racer.

“I can see the benefits of riding large wheels, but for XC, 29-inch wheels are too heavy. My Giant Anthem X is very poisoned. I know the Anthem X 29er is coming soon, but its weight gain will be too much compared to my bike.

This is where difficulties arise with spare parts. I now have a lot of 26-inch wheels and tires and a lot of spare parts for them, so the only way is to upgrade to a 29er. it is to completely replace one system with another and ride only on the 29er all the time, which is a very serious decision. I leave sponsors to decide what to ride.”

“Niners. just rubbish. They are clumsy, flexible, heavy and are only suitable for very tall people or elderly people who require special attention, as well as for beginners who cannot ride. I love it when I hear that because my secret will stay safe a little longer.

Some fancy, badly designed bikes, frankly. full of rubbish. And even successful models do not allow you to perform well complex figures and tricks, in addition, they are slower when accelerating and even the toughest parts swing in them. All this means that they will never suit some people.

If you ask me which bike is the fastest for long, difficult trails with uneven terrain, I have no hesitation in answering. ‘niner’. This has become even more relevant with the addition of the 2011 optional equipment. Larger wheels mean less sensitivity to bumps, more moment of inertia and better handling on difficult uneven terrain.

They maintain great speed and traction when climbing or cornering. A good 29er with a stiff rear suspension downhill behaves like a normal bike with 100mm suspension. A good 29er with 100mm travel will behave on fast rocky descent like most 26-inch bikes with 150mm travel.

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Simply put, riders who are 26 inches behind will lead by 29. This is not just PR or speculation. I’ve seen this happen in the group endurance races and now at the XC World Championships. Although, as I said, if people do not believe me, then my secret will live a little longer.”

## How much to swing the wheels on the bike. 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? Let’s point out right away that tire pressure is the most important factor that affects the flotation and rolling of your bike. That is why the pressure in the wheels must be correct.

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.

A floor or hand pump with a pressure gauge will help you correctly determine the pressure in the wheels. Be careful when using compressor pumps as they deliver a large amount of air at high speed, which can cause the chamber to explode.

## Additional tips for choosing the right pressure:

When choosing the right tire pressure for your bike, you should also pay attention to factors such as:

• The surface you are rolling on. So, when driving on rough terrain, soil or sand, it is enough to inflate the tires just above the minimum value, so the grip will be better. When driving on asphalt and flat surface, it is better to choose a value close to the maximum. this will improve the roll.
• Your bike type. We recommend using different pressures depending on your bike type. For a mountain bike, this value should be lower than for a sports road bike, for example. The principle here is that the narrower the tire, the higher the pressure in it should be. And vice versa.
• Outside temperature. In the heat, it is better not to pump the wheels to the maximum, because the air in the chamber heats up and the pressure rises additionally. And in winter, even when riding on snow, the pressure should be at least average to achieve maximum tread grip.
• User weight. Inflate the wheels more if you are heavy or carry heavy loads on your bike.

To summarize, it should be noted that there are no hard and fast rules for how many atmospheres your wheels should have. And the right answer will be your accumulated experience.!

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## Nuances of determining the pressure in bicycle tires, norms and recommendations

The comfort and safety of riding a two-wheeled vehicle is determined not only by the technical characteristics and the serviceability of the mechanisms. Of great importance is the pressure in the tires of the bicycle, which is measured using a special device. a pressure gauge. Parameters affect control, vehicle passability. Strict adherence to the recommended indicators will significantly extend the life of the bike.

## How important is the pressure parameter

There is no definite answer to the question of what pressure should be in the tires of a bicycle. This parameter is purely individual for each person. When choosing, they usually take into account the riding style, the level of training, the features of the track on which you plan to ride. Performance limits are set by specific technical constraints. There are several factors that need to be considered:

### Take the survey

• High pressure. provides excellent roll and at the same time saves the cyclist’s energy.
• Very high pressure. provokes tire breakdown due to friction against the rim from the inside.
• Low indicators. cause double punching of the tire when overcoming bumps, road irregularities.
• Low pressure. optimal for mountain bikes, riding on rough terrain.

Taking into account the peculiarities of different pressure indicators, we can conclude: the chambers should be inflated so that they provide full adhesion to the road surface, do not provoke wheel damage. The minimum and maximum allowable values ​​are usually indicated on the side of the tires.

Too low pressure in the wheels of the bicycle leads to breaking tires, biting the tube, which increases the risk of breakdowns and punctures. High performance accelerates rubber wear. The optimal parameters are calculated based on the manufacturer’s recommendations and experience, the skill level of the cyclist.

The tubes should be inflated so that they provide full traction and do not cause wheel damage

## Measurement nuances

Safety, comfort, and riding efficiency depend on the pressure level in the bicycle tires. Parameters are indicated using three units of measurement:

• Psi. Pounds Per Square Inch.
• Bar. bars.
• Pa. pascal.

Most manufacturers, focusing on American brands, indicate the pressure in the wheel using Psi. English-language sources usually simplify it to pounds. These units of measure are considered obsolete, however, are still used in the United States.

Bar is used to designate chamber pressure in many European countries, and this feature is associated with the proximity to a convenient measurement system in atmospheres. Pascals are the most correct unit, however, they are rarely used when marking bicycles.

The ratio between the listed units is as follows: 1 Bar = 100,000 Pa = 14.504 Psi. Based on this formula, you can calculate metrics suitable for any bike. To simplify the conversion of pounds to the usual Bar, you need to divide the value by 14.5. Typically the following markings can be seen on tires:

• 2.38-4.0 are atmospheres or bars.
• 95-135. lbs.
• numbers with more than 3 numbers and the prefix k indicate metric pascals.

Most manufacturers mark the wheels of the bicycle with the designation of the optimal parameters. Indicators are duplicated in Psi and Bar in the form of an acceptable range with clear limits. It is not recommended to go beyond the specified limits, otherwise it may lead to tire damage.

The wheel pressure of a child’s bike is determined by the fitness level and weight of the child. With a weight of up to 30 kilograms, 2.4 Bar parameters are suitable. When the baby learns riding skills, you can reduce them to 2.2-2.1 Bar.

## Standards for different types of tires

The tire pressure of bicycles designed for riding on asphalt roads usually does not cause any problems. You should definitely consider the information on the side of the tires. So, if the maximum values ​​are 7 Bar, you can pump the cameras up to 6.5 Bar and drive at high speed on smooth tracks. The situation with specialized bicycles is somewhat different:

• Models for highway driving. Normal tire pressure is 8-11 atmospheres. The optimal value is selected taking into account the weight of the cyclist, type of tire, speed limit. It is most convenient to pump up the wheels with a hand or foot pump equipped with a pressure gauge. After about a week of intensive use, the readings will drop by 1-1.5 atmospheres. When feeling the wheel, it will not be noticeable, but the device will show the difference.
• Citybikes. To determine exactly how many atmospheres are optimal for a bicycle, you need to specify the diameter of the wheels. For 24, 26, 27 inches, this is 2.2-4 Bar. Exceeding the norm leads to a strong deformation of the rim during acceleration, sudden braking or overcoming bumps.

Fatbikes are special means of transportation. They were created specifically for skiing on snowy, sandy, rocky surfaces. The tires on these models are 2–3 times wider than those on a city bike or mountain bike. This allows the wheels to easily overcome off-road, unevenness. The table will help you find out the optimal pressure for different conditions with a cyclist weighing 80 kilograms.

A clear knowledge of the parameters helps to determine to what level of pressure the wheels should be pumped. If the indicators are exceeded several times compared to the recommended ones, there is a high risk of rupture of the camera along with the tire after overcoming the first hundreds of meters of the path. Compliance with the standards will help maintain the serviceability of the bike, extend its life.

For road bikes, normal tire pressure is 8-11 atmospheres For city bikes with wheels 24, 26, 27 inches, this figure is 2.2-4 Bar Depending on the condition of the snow, the pressure in the wheels of fat bikes varies from 6 to 10 PSI If the pressure in wheels several times higher than the recommended values, there is a high risk of rupture of the chamber along with the tire already at the very beginning of the journey

## What to consider when inflating

The optimal pressure to use in a bicycle tire will not only depend on the manufacturer’s recommendations. The following factors are of great importance:

• Seasonality. On hot days, you don’t need to pump your bicycle wheels to high pressures. The fact is that the air inside the chamber will warm up under the influence of sunlight. This will cause an increase in performance. In winter, when traveling on snow, use parameters below average to achieve good traction of the tread to the surface.
• Cyclist weight. With a body weight of 50 kilograms, it is necessary to swing the wheels up to 2.59 BAR, with 120 kilograms. up to 3.4 Bar. If there is additional cargo, the pressure is increased by 1% of the average for each extra kilogram of luggage. However, significant overloads and high parameters can provoke deformation of the rim.
• Terrain type. When driving on rolled roads, asphalt, rocky roads, the pressure in the chambers should be slightly above average. The same rule applies to stunt, sports bicycles. Riding on sandy, soft terrain is better at low rates.

Tire pressures for road bikes intended for firm, level roads should be above average. Low rates are optimal for fat bikes.

The type of bike is very important. For mountain models, lower rates are selected than for road, sports options. Rule of thumb: the narrower the bicycle wheel, the higher the pressure should be.

Cyclists who monitor and correct pressure after each ride do not face tire repairs throughout the season. In a wheel inflated according to all the rules, rubber does not puncture, does not break, and lasts longer. Always follow the manufacturer’s recommendations, regardless of the bike model.

On hot days, do not inflate the wheels to high pressures If the cyclist’s body weight is about 50 kilograms, then the recommended tire pressure is 2.59 BAR, more than 100 kilograms. 3.4 Bar. chambers slightly above average Road bike tire pressures should also be above average By monitoring and adjusting tire pressure after each ride, major repairs can be avoided throughout the season

## Video. BIKE TIRE PRESSURE WHAT SHOULD BE AND WHAT TO RUN?

Every bicycle 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.

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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 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 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 “well-inflated wheel” can be very different for every cyclist. That is why it is best 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.

## Pressure effect

In fact, the optimal pressure in the tires of a bicycle is a purely individual parameter, which 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 “roll”. 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 on 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 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 be information about the permissible pressure range in the chamber.

Why is this information not shown on the camera itself? Because the only point in it that is 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, that is, when they say that a pressure of 2 pounds, they mean Psi. This unit of measurement is outdated, used only in the United States, but, as they say, “more alive than all living things”.

Data from a smart pressure sensor on a smartphone screen

Bars are also obsolete units of measurement, but they are actively supported in 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.

### 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 designation and is duplicated in BAR and Psi as 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.

## How to pump

Bicycle luggage requires maintenance and inflation very often. Even on the most “hardy” 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.

“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 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 lack 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.

## Standard pressure

Here are some tables that will help you navigate in difficult situations, namely:

• an unknown tire without markings was purchased;
• the marking is incomprehensible, the numbers are marked in unknown units.

## 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 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 will help you find the middle ground.

## Pressure effect

In fact, the optimal pressure in the tires of a bicycle is a purely individual parameter, which 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 “roll”. 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 on 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 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 be information about the permissible pressure range in the chamber.

Why is this information not shown on the camera itself? Because the only point in it that is 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, that is, when they say that a pressure of 2 pounds, they mean Psi. This unit of measurement is outdated, used only in the United States, but, as they say, “more alive than all living things”.

Bars are also obsolete units of measurement, but they are actively supported in 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.

### 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 designation and is duplicated in BAR and Psi as 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.

## How to pump

Bicycle luggage requires maintenance and inflation very often. Even on the most “hardy” 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.

“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 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 lack 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.

## Standard pressure

Here are some tables that will help you navigate in difficult situations, namely:

• an unknown tire without markings was purchased;