# How many points to swing on a bike

### Slicks

For driving on asphalt and well-rolled dirt roads, you need to pump up the maximum pressure.

Slick wheels are the easiest to swing for road and city bikes. Due to the fact that they have a small volume of wheels, the pressure must be high. The more pressure, the better the roll and the higher the speed. So swing boldly a little bit by 0.2. 0.4 under pumping to the maximum pressure indicated by the manufacturer on the tire, especially in hot weather.

### Bicycle tire pressure in extreme summer heat

If the temperature is high outside, it is better to reduce the pressure a little. Remember that the wheel can overheat. The hot asphalt itself and the friction of the tires on it heat the chamber and the air inside it, which accordingly increases the pressure. So, a tire inflated to its maximum value in hot summer can suddenly explode.

In more detail the question of the influence of air temperature on tire pressure is described in a separate article “Dependence of tire pressure on temperature”. Calculation formulas are also given there.

Here, for example, we give a table for determining the pressure in a bicycle wheel from the air temperature, if it is inflated at a temperature of 20 ° C.

## How to check chamber pressure.

Honestly. without a pressure gauge in any way. So you need a bicycle pump with a pressure gauge, a separate pressure gauge connected to the nipple, or you will have to pump up the tires at the service station. they always have something to measure the pressure in the wheels. You need to be careful with the service station. There are times when a valiant worker, forgetting about the pressure, hits the wheel with everything he can and the camera and the tire explode in a matter of seconds.

There is one piece of advice. When you know exactly what pressure is now, try squeezing the tire with your fingers. So gradually you will learn to determine the approximate pressure in the chamber by tactile sensations. Remember that already from two bars (atmospheres), the tire feels quite tight to the touch.

If the pressure is low, then the tire can easily break through. In addition, under-inflated wheels extinguish a large percentage of the cyclist’s efforts to accelerate and actually ride. The tire “spreads” on the asphalt and, moreover, is very quickly erased from high friction on it.

This also leads to the so-called snake bites. two adjacent breakdowns. Occurs when a sharp run over a curb, stone or bump. In this case, the tire is pressed against the rim, the chamber is clamped between the rim and the object that the wheel has hit, and breaks through in two places at once.

Riding at low pressure can be dangerous for the rims, you can easily get an eight on the wheel. At low pressure, frequent punctures are possible, and when cornering, the tire can generally fly off the wheel, which is already life-threatening.

over, if the wheel is heavily pumped, then it can easily puncture the rim (from the side of the spokes). To protect the camera from this, use a special rim tape. This is a rubber or polymer strip that fits over the rim to prevent the spokes and sharp edges of the spoke holes from punching the tube. So a middle ground is needed. A sample of such a tape is shown in the figure on the right.

It is generally recommended to check the pressure before each ride (at least by touch). Remember that the nipple is not the only poison. The air etches a little through the rubber itself, albeit slowly. Because of this, every month, an inflated tire itself loses an average of one bar of pressure.

I would like to note one more point. When driving, the main load is on the rear wheel, while the front wheel is not so heavily loaded. Based on this, the pressure in the rear tire can be slightly higher than in the front. On average, about 10%.

## The dependence of pressure on the type of surface and type of tire

### What pressure to choose?

For everyday driving it is worth choosing an average value. It is clear that it cannot be identified by touch. And for this it is not bad to have a bicycle pump with a pressure gauge. It usually has a scale with values ​​in two of three units. Often, the built-in pressure gauge does not give accurate readings, but for an average value it will do quite well.

For different types of bicycles and even different wheel widths for the same bike, the recommended pressures will be different. So for a mountain bike, the recommended pressure is usually in the range from 2.5 to 5 atmospheres. And for a road bike with thin wheels. from 6 to 9 atmospheres! The rules are general for all bicycles, but we will, since the site is still about mountain bikes, will be considered within the framework of the article, there are more of them.

The width of the tire is key. This is also indicated on the sidewall of each bicycle tire (see example in the picture) The narrower the tire, the higher the pressure should be. The wider, the lower the pressure. Usually a tire has a size designation in inches, for example 26 × 2.10, where 26 is the tire diameter (standard diameter for mountain bikes, the rarer standard is 29 inches), and 2.10 will be the width. And the size is in millimeters, for example 54-559. Of these 5 digits, the first 2 are the width of the tire (54 mm) and the last 3 are the diameter of the tire (559 mm). You should inflate the wheels more if you have a lot of weight or you are carrying a heavy load. There is a rule that for each additional kilogram of weight, the pressure should be increased by 1%.

Let’s take a look at the recommended tire pressures based on the rider’s weight:

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### Tighten Bolts Correctly On Your Mountain Bike | GMBN Tech How To

• Weighing 50 kg (110 lbs). 2.4-2.6 atmospheres (35-38 psi)
• Weighing 63 kg (140 lbs). 2.5-2.7 atmospheres (37-40 psi)
• Weighing 77 kg (170 lbs). 2.7-2.9 atmospheres (40-43 psi)
• Weighing 91 kg (200 lbs). 2.8-3 atmospheres (42-45 psi)
• Weighing 105 kg (230 lbs). 3-3.3 atmospheres (45-48 psi)
• Weighing 118 kg (260 lbs). 3.2-3.4 atmospheres (47-50 psi)

Never exceed the maximum allowable pressure and ride a bike that is inflated below the minimum pressure indicated on the tire. To do this, it is recommended to check the tire pressure of a mountain bike once a week, 2 times more often on a road bike, and before each ride on a road bike.

The outside temperature also plays a role. If it is very hot, then even while driving on the asphalt it is better not to inflate the wheels to the maximum value. Overheating of the wheel may occur. And in winter, on the contrary, it is worth choosing, even when skiing on loose snow, the pressure is not lower than average.

All articles in the section are about mountain bike repair, cleaning and lubrication. about the author

In this article, we will answer the question that many cyclists are asking: How much pressure should the tires of a bicycle be? It should be noted right away that tire pressure is the most important factor that affects the flotation and roll rate of your bike. That is why the pressure in the wheels must be correct.

The required pressure will help you determine the allowable values ​​on the tires. All products, regardless of the manufacturer, must indicate the minimum and maximum allowable pressure. In rare cases, only one value is indicated. the maximum. Also, these values ​​can be specified in different units of measurement: P.S.I pressure in pounds (American designation) or BAR. pressure in bars or atmospheres. In the table below, we have compared all possible values ​​with a person’s weight so that you can easily determine the required pressure based on your weight.

Cyclist weight (kg) Pressure (psi) Pressure (bar)
fifty 35. 38 2.38. 2.59
63 37. 40 2.52. 2.72
77 40. 43 2.72. 2.93
91 42. 45 2.86. 3.06
105 45. 48 3.06. 3.27
118 47. 50 3.2. 3.4

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

### Why the pressure has to be right?

The first thing to mention is that the pressure required will be different for different types of bikes. Do not be afraid to pump the wheel, the upper limit is usually quite high and very few people will find it comfortable. It is worse to drive under-pumped. you can easily puncture or puncture a wheel. And you will need to repair or replace the bike camera.

And this is not all that a half-flat tire threatens. Wheels, due to insufficient tire pressure, damp worse. And bumps on bumps in the road can damage the rim and form eights on the wheel.

### Half slick

For semi-slickers, it is important to choose the right pressure for the very surface on which the bike rides.

Riding on a hard surface. asphalt and rolled primer. At low pressures, all the benefits of these tires are lost. A properly inflated semi-slick should roll on a hard surface with the smooth part of the tread. And on soft ground, side lugs are included in the work. At low pressure, the tire will flatten and grip the hard surface with the side lugs, creating additional resistance and wearing out faster.

When driving on soft ground, it is better to reduce the pressure. The low pressure cushions bumps in the road and makes off-road driving more comfortable. In this case, the contact area of ​​the wheel with the road increases, which, accordingly, leads to an improvement in grip. This is especially felt on descents and sharp turns.

When riding on sand or snow, it is better to increase the pressure. it will improve grip and control of the bike.

## Bicycle tire pressure versus cyclist weight

This should be immediately clarified. The pressure in the tires of a road bike always varies between 6.5-9 BAR (up to 130 PSI) and does not depend very much on the weight of the cyclist.

The pressure in mountain bikes is always lower.

Here is a table showing the dependence of the pressure in the wheels of a mountain and city bike on the weight of the biker:

You can focus on the following. for each additional kilogram of weight, the pressure should be increased by 1%.

The pressure in the tire directly affects its durability. Riding on badly inflated tires wears them out quickly.

### Which airlines are allowed to travel by bike?

Different airlines have different rules for cycling. In the spring of 2017, Yellow Jersey Insurance compiled information on airlines and their various regulations to help you decide which airline to use and how you should pack your bike.

### Reflectors:

• As with headlights, the legal requirements for reflectors only apply between sunset and sunrise and include a red rear reflector and four amber reflectors for the pedals, one in front and one behind each pedal. Common sense dictates that replacing the amber reflector on the pedal with a reflective strip on the heel or ankle may be sufficient, but unfortunately none of them meet the legal requirements that apply only to pedals, which is an annoying problem for those who use certain pedal brands without clamps, not equipped with reflectors. also refers to the area of ​​legislation requiring revision.

### Why is it so important to choose the right tire pressure, and what is the effect?

For the correct choice of tire pressure, it is necessary to take into account all the above factors and understand the consequences of pumped or deflated tires.

Increased pressure (not higher than the maximum specified) is necessary:

• for bikers with heavy weight and transportation of goods. tire sagging is reduced;
• for driving on tracks with good coverage. the roll rate and speed increase;
• for extreme driving style and driving on stones. the probability of breakdown is reduced;
• at low air temperatures. the risk of pressure drop below the minimum is reduced.
• driving comfort decreases;
• rubber wear increases;
• the likelihood of tire damage and puncture of the tube on the rim.
• for driving off-road and rough terrain. adhesion increases, damping properties increase;
• at high air temperature. the risk of pressure increase above the maximum is reduced.
• the likelihood of a tire falling off the rim;
• double puncture of the camera when the rim hits an obstacle;
• turning the tube inside the tire with damage to the nipple.

As you can see from the article, in order to properly inflate the wheels, you have to take into account many factors. However, for the rider, the habit of regularly checking and maintaining the required tire pressure will pay off not only with a comfortable ride, but also with significant savings on replacing prematurely damaged tires.

### Air temperature

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.

### Bike type

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.

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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.

With bikes for asphalt roads, everything is simple. the more pressure, the better the roll. Look on the sidewall of the tire, there must be written a valid value, in psi, or in bar (atmosphere). If the maximum value, for example, 8 Bar, then score 7.5 and enjoy the speed.

I highly recommend getting a good floor pump with a pressure gauge (I bought it here), because pumping a road tire with a portable pump is still a torment, even if it is capable of delivering high pressure.

I will add that the air is etched through the rubber itself, and in about a couple of weeks the pressure drops by 1-2 atmospheres. You can’t feel it with your fingers, so a floor pump with a pressure gauge is just the right thing to do.

If you inflate a road tire below average, you can catch a tube breakdown called a snakebite. This happens when the wheel hits a hard object and the tire hits the rim. The result is two small holes that look like a snake bite.

### Prohibited miscellaneous includes:

• As Boris Johnson discovered, it is a criminal offense to provide your wife with a backrest on a bicycle because it is illegal to carry more than one person on a bicycle unless it is designed or adapted to carry more than one person. Interestingly, the legislation does not apply to cycling, it simply limits the number of people who are allowed to ride an unadapted bicycle (bicycle is not defined, but supposedly means two wheels, so what about tricycles?).
• Holding onto a moving car or trailer while cycling, although there is an unjustified caveat that you hope will protect anyone who desperately grabs onto the side of the vehicle from being run over.

### Cycling bag CTC

Around the same time that other airlines began pushing for bicycles in bags, BA stopped distributing them as freely. In order to secure the future of cycling, we set up a bag with a similar specification from the maximum thickness polyethylene available for this purpose. We developed a large (1.27 m wide and 2.5 m long) heavy-duty (125 micron) polyethylene bag to create A special bike bag that’s large enough for a real touring bike, yet light enough (0.8 kg). and small enough when folded to carry around on your bike! (It can also be posted in front of the departure point.)

Unfortunately, while bicycles ride just as well (or badly), some airlines have written their rules for transporting bicycles in terms that raise doubts about whether such a bag will fit, and check-in staff sometimes look askance. on bikes, which, as they put it, are just in a plastic bag. As such, cyclists using these bags sometimes have problems checking in and often have to sign a damage waiver before their bike is accepted.

The bag is accepted by most airlines and several express bus operators, check with your carrier.

Expect to replace this product after a period of regular use, depending on wear and tear from typical handling.

The bag protects the bike, allowing the movers to see what they are doing, but accidents can still happen. Optionally add your own spacer (e.g. pipe insulation).

### The Swing Bike

The filling method is your choice. Parcel tape is not included.

Try to elicit the sympathy of the front desk clerks by agreeing that this is not much, but unfortunately this is the best thing you can do!

We know it would be helpful to print bike pictograms and a CTC bike bag on them, but have not yet found a supplier that would print on such a heavy bag. only thin plastic and we will not compromise on thickness.