What the Bike Roll Depends on

How to improve bike roll. How to improve bike roll with tires

Why you need to change stock tires

Types of tires that significantly improve rolling

2.1. Dry ground tire

Influence of air pressure in tires on rolling

What are tubeless tires for?

Why you need to change stock tires

bike, roll, depends

Among the many ways to improve bike roll, the most effective and obvious is to change tires for several reasons.

Many mountain bikes and similar mountain bikes are fitted with aggressive mud tires.

However, it so happened that most cyclists ride them on asphalt or parks, where the use of such tires is ineffective and makes no sense.

Also, many people buy bicycles with 29-inch wheels, hoping for better rolling, but are faced with the fact that it is extremely difficult to ride on tires with mud tread.

The way out of situations with “non-rolling” bicycles is simple. pay attention to the tires and do a few manipulations.

Types of tires that significantly improve rolling

2.1. Dry ground tire

If your bike is equipped with aggressive tires, and you prefer not to ride in mud and soggy ground, then fitting tires designed for dry ground will be a good option for you.

Leading tire manufacturers competently develop the tread and rubber composition, so you can ride them even on smooth asphalt with minimal energy loss. In our article “Top 5 XC Country Tires for Dry Weather,” you can figure out which tires to buy. But if you do not have enough finance for the tires mentioned there, use an inexpensive option from Kenda. Kenda Small Bloсk

They will have minimal rolling resistance on hard surfaces, allowing you to keep average speeds higher than most stock options. In addition, Smallblock and other dry-ground tires roll and hold very well in corners on unpaved paths, which makes sense.

If you often ride your bike to work or around the city, then installing “half slick” will solve the problem of suffering when driving on asphalt.

Due to the fact that on such tires the central track is smooth or with a minimal pattern, they practically do not resist rolling, which allows you to move at the same speed with less effort. Interestingly, the side hooks seem to be slightly raised, due to which only the smooth part contacts the asphalt. They begin to help you on paths and forest roads with hard ground. By relieving the tire pressure a little, you will let the lugs come into play.

A tire that has a smooth surface, which provides maximum roll on asphalt and hard, level ground. The surface may have cutouts and paths to drain water, but there are tires that have absolutely no grooves.

Slicks will save you if all your skiing is concentrated in the city or out of town on asphalt. If the asphalt in your city is not very good, you can put wider slicks for a more comfortable ride over cracks, pits and old grainy surfaces. For example, Schwalbe Big Apple

!Life hack for niner owners. The rim seat for the tire on 29 and 28 inch wheels is the same in diameter. On the “niner” rims can be wider, but tires intended for “hybrids”, starting with a thickness of 35 mm (markings 622×35 or 700×35С), will also fit on them.

Influence of air pressure in tires on rolling

Besides choosing the right tire, it is important to get the right pressure. In most cases, the recommended pressure starts from 2.8 atm, which in some conditions is too much. It all depends on where and how you are going to ride, as well as on your weight.

Everything is very clear here. Inflate the tire to the maximum recommended pressure and ride without knowing the problems with both roll-over and tube breakdowns.

Solid, level ground

Quite a few field or forest roads near cities have a smooth surface with smooth pits and bumps that do not cause discomfort. In such a case, the tire should be inflated just above the average recommended pressure. You can also act in the presence of a small number of irregularities in the form of roots, bumps, because if there are few of them, they will not cause much discomfort.

Uneven ground

There can be many reasons: roots, shallow holes, “comb” from a large number of cars. In this case, the tires should be inflated to the minimum recommended pressure. In especially neglected cases with the road surface, it is permissible to use pressure below the minimum.

But keep in mind that in this case, the risk of punctures and breakdowns of the camera significantly increases. On low-quality tires from excessively low pressure, sidewall cracks can go.

Cross Country Training / Competition

Here pressure is almost always used below the minimum allowable on the tire. While you will have the edge on straight sections or on long climbs on well-inflated tires, you will lose a lot on technically challenging elements. For example, when entering a steep junkie or when leaving a steep slope full of turns

Tires should not only roll well, but also work out bumps, keep you in corners, and not slip on inclines. Since there is such goodness on the cross-country tracks in bulk, you should choose such pressure at which you will be comfortable to ride and at which you will not punch the tire to the rim on bumps.

What are tubeless tires for?

If you participate in cross-country competitions or just ride a lot and you are tired of punching or puncturing your tubes, tubeless tires have come up with a good option for you to get rid of most of the problems.

They allow you to keep low pressure in the tires, which is important for racing, when driving in adverse weather conditions, on uneven surfaces, as well as in winter.

For the advanced. Research shows that tire / tube friction loses up to 1 W of power while driving. If this tells you something, then there is reason to think. The problem of power loss is solved here just by tubeless tire installation.

True, not all rims will fit tubeless tires and some conditions are needed to install them.

A rim that allows tubeless tires to be fitted must have special markings (tubeless ready, 2bliss, etc.)

The same should be true for the tire. True, some manufacturers by default make their tire beads suitable for tubeless installation (for example, Schwalbe and Continental)

If the wall of the rim from the side of the seat for the tire is not solid, then it must be glued with a special tape covering the holes for the spokes

Special nipples are required to seal the nipple hole and deliver air to the tire

Sealant. Required for sealing micro holes in the tire / rim connection, the tire itself, as well as for sealing small punctures while driving.

Not only tires that improve roll-off are told in the video

What determines the roll of the bike

On my site there is already an article about why some frames “roll” while others do not, so today we will talk about a simple roll.

Let me explain a little the difference in terms: rolling is literally the efficiency of converting pedaling energy into movement, and rolling is how far the bike can roll out without applying energy.

Under ideal conditions, there are only two things that affect rolling. the friction in the bushings and the rolling resistance of bicycle tires. In reality, there are slightly more factors.

Roll on asphalt and hard ground

On the highway, everything is very clear. a smooth tread and tires inflated with maximum pressure will give minimum rolling resistance.

Newbies riding mtb around town are very impressed by the difference between a 6 ATM bald slick and their stock mountain rubber. Therefore, if your routes pass through the city and country roads, then put on such tires, you will not regret.

Any tread other than smooth tread will impair rolling. The pressure must be pumped to the maximum in order to reduce the area of ​​the contact patch of the tire with the asphalt.

The width of the tire is a little more difficult. on good quality asphalt a narrow tire rolls better, because you can drive more pressure into it. Plus, at high speeds, aerodynamics becomes an important factor, and with narrow tires it is better.

If the asphalt in the city is not of the best quality, then it is wiser to put wider tires on the bike, personally I prefer the range of 32-38mm, for completely broken surfaces 42mm is suitable.

The question of which rolls better. a wide or a narrow tire, in this case remains open, it is rather a matter of comfort. it shakes very much on slicks packed to 6-7 atm.

In especially neglected cities, it makes sense to install a very wide road tire, such as the Schwalbe Big Apple, which perfectly “swallows” potholes in the asphalt, but at the same time has a good roll.

Which tires roll better on soil, sand and stones

For a long time I was convinced that the narrower and maximally inflated tires roll better in all conditions. I was inspired by cyclocrossing enthusiasts. more than once I saw them “make” mountain bikes on cross-country trails.

The theory is that while a soft mtb tire “licks” irregularities, wasting pedaling energy, a hard narrow tire seems to fly over them, keeping roll.

I found confirmation of this theory in my hybrid rides in the forest. a little behind my friends on mtb in technical areas, I quickly pulled ahead, as soon as something solid appeared under the wheels. the bike flew.

The conclusion suggests itself. if you pump the ability to ride on narrow tires in difficult conditions, you will get a decent advantage in speed over a mountain bike, losing only in cross-country ability and comfort.

Probably, this conclusion will be suitable for many Catalans, whose routes pass along mixed roads, where hard soils and asphalt prevail.

And yet, as strange as it may sound, on the ground, rolling resistance is less for wide and soft tires. This is proven by more than one study and experience of cross country cyclists.

Obviously, the wider the contact patch, the greater the rolling resistance of the tire, but this is only true for a hard road. As soon as something soft appears under the wheels. earth, grass, sand, dirt. so immediately the wide contact patch rolls easier on such a surface.

Therefore, to ride in the forest, you should not pump up your MTB tires too much. this reduces the area of ​​contact with the ground and you have to spend more energy on pedaling, despite the fact that subjectively, tires that are pumped up to the stop roll better.

I want to emphasize that we are not talking about cross-country ability, with which it is already clear that the wider the contact patch, the better it is, namely rolling resistance. Personally, at one time this discovery surprised me greatly, and for a long time I could not believe that this was really so.

All my experience spoke of the opposite: an inflated wheel rolls briskly, with a quick response to pedaling, and a lowered one. as if you are kneading a porridge, the pedaling energy goes somewhere.

My doubts were dispelled when I put tubeless wheels on my mountain bike and inflated the lowest pressure (within reason). After a couple of days of testing, I had to admit that heavily inflated tires are not the best option for the forest, even with the powerful health that allows you to come off on “hard” sections.

Despite the fact that on straight sections with hard ground it was no longer possible to break in the same way as on cyclocross 32mm rubber, but it turned out that the distance traveled faster (and, importantly, with a lower pulse) on soft wide tires.

Add to this the fact that a weakly inflated rubber with a wide contact patch, in addition to better rolling on the ground, has much better grip, a soft tread “licks” stones and roots. That is why fat bikes are great for rolling on loose, mud and stones.

Larger wheel rolls better

Already many axes have been broken about the topic of niners, whether they really roll better than regular 26 ″ bicycles, but for the sake of order, it is necessary to mention the fact that a large wheel, other things being equal, rolls better.

And the worse the road, the more stones, cracks in the asphalt and other irregularities under the wheels, the greater this difference will be.

I clearly notice this effect on my folding bike with 24 ″ wheels. it rolls on smooth asphalt no worse than a hybrid, but on a bad one it loses speed much faster.

What does not affect the roll of the bike

In my opinion, friction in bushings has vanishingly little effect on rolling. I know that beginners are worried about the wheel spinning absolutely free and stopping with the nipple down, and are very upset if this is not the case

READ  How To Put A Wheel On A Speed Bike

Believe me, if the bushing is in good working order, if the bearings have enough grease (no more, no less), if the cones are not overtightened, then it does not matter at all how the wheel spins without load. you will not be able to feel the difference on the go.

There is also no difference in rolling between the types of bearings. tapered or industrial, in a closed housing.

One more thing. it is believed that the rider’s weight influences the roll, supposedly the harder the rider, the better the roll. In practice, this is true only when driving downhill.

As a rule, the climb and drop of altitude in ordinary pokatushki is the same, so how much energy “saved” on the descent, so much spent on the ascent.

The same is with inertia. sometimes they say that a heavy cyclist only needs to accelerate, and then the bike rolls by itself. This is not so. most often this effect is felt if the road has an imperceptible slope.

Perhaps my dear readers have their own experience regarding rolling a bike, please share in the comments.

Do you agree that on the ground a soft wheel rolls better than a fully inflated wheel??

Friends, let’s not get lost on the Internet! I suggest that you receive email notifications about the publication of my new articles, so you will always know that I have written something new. Follow the link please.

How to speed up your bike

Often, a cyclist, after purchasing a bike, thinks about whether the “iron horse” meets his expectations.

A popular variety is mountain bikes, which are not very aerodynamic and rolling. Their purpose is rough terrain; for flat roads and highways, it is preferable to use highways.

However, if a person has already bought a mountain bike, there are several possible options for “pumping” it for a road.

Wheels

One of the most important elements affecting bike speed is the tire. Mountain bikes are sold with studded variants.

They are irrelevant in city and highway conditions. Protruding treads increase the grip area, which negatively affects the quality of the roll.

One way to increase the speed of your bike is to change the rubber. The best option would be slick tires. They are characterized by a smooth surface to provide the bike with the maximum degree of inertia.

The slicks also have drainage grooves to ensure reliable grip in the rain.

Using bald rubber instead of slick tires is useless. Such tires are characterized by roughness, which affects the increase in friction force.

The use of bald rubber in the rain is accompanied by additional risks; water is not diverted from the tire, which will provoke sliding on the water. In addition, the bald rubber has a reduced thickness, which increases the likelihood of damage to the camera.

Another type that allows you to increase the roll is rubber for MTB. An alternative name is semi-slick. It is a hybrid of slick and mountain rubber.

When a cyclist has to ride off the highway on rare occasions, it is recommended to purchase MTB tires. They are characterized by spikes at the edges, in the center there is a smooth surface.

Semi-slick allows you to stabilize the position of the bike on the road during a turn, when the cleats begin to contact the surface.

The roll rate also depends on the width of the tire. It is recommended to purchase narrower tires to increase the speed. Road bikes are fitted with the narrowest possible tire.

However, for a mountain bike, this option is not suitable due to the width of the rim. When choosing a tire, this indicator also needs to be paid attention.

Some bike owners install a semi-slick on the front wheel, and a slick one on the rear, which has a positive effect on rolling and provides acceptable grip on the ground.

It will also be possible to improve the reel by increasing the pressure in the chambers. The maximum allowable pressure is indicated on any rubber, the rubber should be inflated, almost to the upper value.

Damping component and transmission

On a hardtail, the most common type of bike, the front fork sways as you ride, which negatively affects the bike’s speed. Cyclist efforts are leveled.

The rear shock absorption system significantly reduces the speed of the bike during rocking, and also adds extra weight to the bike.

Increasing the speed of the hardtail requires mounting a rigid fork. It is characterized by its low weight, especially the carbon types. This will increase the roll and inertia of the bike.

The carbon fork will also have a cushioning function due to the elasticity of the material. Aluminum counterparts are characterized by high weight and high degree of rigidity.

Most soft forks have a lock switch. This will keep the fork rigid. However, you must remember to change the position of the switch in order not to spoil the suspension system of the bike.

To increase the speed of the bike, you need to install larger sprockets. This will have a positive effect on the maximum speed indicators of the bike. This is explained by an increase in the gear ratio, it will take more effort to rotate the pedals.

Cyclist landing

One of the easiest ways to increase bike speed with your own hands.

The narrowness of the fit of the owner of the bike has a positive effect on reducing the resistance of air masses. This increases the speed of the bike.

To improve the aerodynamics of landing, professionals recommend purchasing a long stem, it must be mounted as low as possible.

There are also special sun loungers that are installed on the steering wheel. The included armrests save energy. The arms will be at the level of the saddle.

Some cut the handlebars to shoulder width on their own, the quality of bike handling will suffer, but aerodynamic performance will increase.

You also need to make sure the seat height is adjusted correctly. To this end, you need to sit on the bike and rotate the pedal to the bottom position. The lower limb should be almost fully extended.

With constantly bent legs, pedaling efficiency is much lower. It is also a provoking factor for the development of joint diseases in the knee area.

Pedals

Most cyclists pedal with one foot, while the other is resting. These are the usual varieties of this element.

In order to increase driving efficiency, professionals recommend the use of contact analogs. Fixed with spikes, special shoes are required for their use. shoes for a bicycle.

The main difference is that you can not only push the pedal with your foot, but also pull up the pedal with the other foot at the same time. Optimal performance is achieved by developing the habit of circling rather than pressing with your feet.

An outdated type of contact pedals and a more budgetary mechanism with toe clips. It is presented in the form of special straps that fix the lower limb on the pedal.

The main disadvantage, in comparison with contact counterparts, is the difficulty of quilting and the poor degree of fixation of the leg.

On the plus side, you can use toe clips in any shoe or even without it. For this purpose, you need to attach a small strap to the pedal as follows.

Maintenance

To increase speed if the bike is not new, the bike will need to be serviced. Pay attention to each knot of the “iron horse”.

Industrial bearings play a special role in speed. Replacing them can significantly improve the speed performance of the bike. It is also required to lubricate and clean the chain from dirt and dust. It will be beneficial to regulate the brake system when the pads touch the rotor or wheel rim.

It also requires adjusting the taper of the bushings. The procedure is rather complicated, if you have doubts about the quality of the performance yourself, it is recommended to seek help from a bicycle master.

Before lubricating the chain, carefully clean the stars and the rollers themselves, rinse all the transmission elements. To avoid rusting, it is recommended to use gasoline instead of water. This will clean the chain in any hard-to-reach place. Liquid bases are used for lubrication.

After the application procedure, you need to wait 15. 20 minutes, then remove the remaining excess with a rag. If you do not do the last procedure, dirt will quickly adhere to the chain, which will cause the cleaning to be repeated.

Make sure the chain is in good condition and not stretched. Otherwise, the cassette itself suffers. Then there will be a need to change the entire transmission system.

Bike weight

For professional riders, the bike weighs about 7 kilograms. This allows you to accelerate quickly and spend less energy maintaining speed. To lighten the bike, you need to replace heavy parts with lighter counterparts.

The lower the weight of the equipment, the higher the price. Carbon fiber parts are considered the best option, but they are characterized by a high monetary value.

In case of financial constraints, it is recommended to replace the frame, for example, from steel to aluminum.

The speed depends not only on the condition of the bike, but also on the rider’s pedaling technique. One way to increase your average cycling speed is to improve your skills, work on breathing.

velo-travel.com |

Hello! The topic of today’s post is the roll forward and, accordingly, the dynamo of the bike acceleration. Personally, we, the velo-travel.com team, believe that rolling on his bike is the most important thing for a tourist! Why then? Because there are several very significant advantages of rolling forward and not a single disadvantage.!

It will be very important to note that we will consider the roll-forward from a completely different side, not in the way that everyone usually looks at this parameter. After all, the first association with the word “roll forward” is an easy and quick descent from a hill without pedaling. But no! Now we will write something new and non-standard!

List of questions and key points of our article:

  • 1. What is roll forward?
  • 2. Why rolling is so important for a tourist?
  • 3. What the roll depends on and how to achieve it?
  • The roll, as they write on the forums and top bike sites, is the distance that a bicycle will travel when it is traveling down a hill without pedaling. Or there is another definition. this is the amount of energy expended on pedaling to overcome the same distance.

    So, on the forums there are a lot of open topics for these discussions, but the sadness of the realities of our life. literally all cyclists from discussing the roll-over go to bragging about their ultra-light bushings, or expensive lubricant. And we will clearly define the term “roll forward”.

    The roll is the amount of distance traveled, with the expenditure of the same physical efforts of the cyclist. But only! It is categorically impossible to measure the roll of the bike while going downhill. Why? Because the weight of the bike, the weight of the cyclist and the weight of the luggage affect the roll-off while descending the mountain. The one who has a large mass has the advantage. Tire size, tread type and wheel diameter are useless here.

    The bike rolls best when it is easy to roll. What does it mean? This means it is much easier to accelerate the bike, maintain average speed much more efficiently, and ride long distances easier.

    And now we smoothly move on to the second open question of our article.

    Cycling is about bridging distances in order to discover fascinating places. We all want to come, for example, to a waterfall and appreciate its beauty. We will feel the beauty of the environment only in one case. if we feel great. And if we are too tired, nothing good will happen. It is in order to get a thrill from the hike that you need:

    A parameter such as the roll of a bicycle belongs to the category of serviceable equipment. Everyone understands that if your bike is easy to roll, then the chance to enjoy the ride increases significantly. It is very important!

    Think about it and get the right fit on improving your bike to get the most efficient vehicle possible.

    How to get a good roll forward?

    A good rolling performance is primarily dependent on the tires that are mounted on the bike. Slick tires are designed for city and highway driving. A rubber with a high tread and aggressively positioned studs is better suited for riding on the ground. For driving on loose surfaces, use extra wide tires with slick protectors. There are some tires that have pronounced spikes, but the center track of the spikes is narrow and flat. With a well-inflated wheel, only the central track, which resembles slick rubber, comes into contact with the surface. This ensures excellent roll-off on asphalt. And if you go on the ground, you just have to lower the tire pressure, and due to the increase in the contact patch, the passability and roll will increase. Yes, yes, exactly the roll. For some reason, everyone thinks that a well-inflated rubber rolls well both on the ground and on the asphalt. When driving through the forest, it is better to lower your slick tire. and you will notice the result. In addition, a heavily pumped slick increases the risk of cutting the tire on a stone or bump. Be careful on the roads!

    READ  How To Put The Bike Chain Back In Place

    If you like to travel only on roads, highways, highways. install narrow slick tires. If you ride only off the asphalt. buy an aggressive tire, everything is clear here. What if you skate both there and there? You never know where the next turn will lead. The bottom line is that there are two ways out of the situation. Either it is the tire described above with spikes, a thin slick track in the middle, or a wide slick. Yes, 2 “wide slick tires are a great option for tourism. The flat contact surface provides good acceleration dynamics, and the wide contact area ensures stability on the track and in the swamp.

    Bicycle suspension is the enemy of rolling! The softer the suspension, the more power is spent on pedaling. This is why two-pendant bikes are rarely used in cycling tourism. But there are also exceptions. Quality bikes with high-end equipment have travel locks on the front fork and rear shock absorber. They make the bike rigid and rolling in a second. Therefore, if you like to travel in comfort and have an extra pair of green banknotes, you should take a closer look at such bicycles. In addition, the weight of such a bike will not be much higher than the weight of the average country rider. The best option for a tourist would be a country man, equipped with a fork with a lock-out (thus a blocker). In order to keep your hands from getting tired during long driving on rough roads, the fork is unlocked and you can ride in comfort. When entering the track, for the effective use of the expended forces, it is worth blocking the fork. It is important.

    It is not the rubber tread itself that affects the roll, but also the wheel diameter. The larger the wheel, the more it rolls up, but at the same time it is more difficult to accelerate. The essence of large diameter wheels is that it is more difficult to fire it up, but it is much easier to maintain a constant pace. Here’s a simple example for you: a 26-inch slick tire has the same roll as a 29 aggressive wide tire. Think, decide for yourself. And about 29 wheels, we already wrote in our article about wheels.

    Frame geometry also affects bike roll and acceleration dynamics. What frame geometry is considered rolling? In order not to burden you with the theory of sines and cosines, let’s say simply and clearly. the smoother the upper frame tube (the one that goes from the top of the head tube and connects to the upper part of the seat post), the better the bike roll. Better stability on straight asphalt, better dynamics, but much worse off-road performance on a nervous road.

    And finally, this is the state of the bushings. If the bushings are lubricated and adjusted, the bike will ride normally. If you notice a clear decrease in rolling, it is worth going through the bushings, this is definitely.

    And remember, a good bike is a serviceable bike, no matter how much it costs or what manufacturer. Good luck to everyone on and off the road :).

    Bicycle roll

    Bicycle roll depends on various factors: frame characteristics, shock absorbers, wheel diameter, tires, tube pressure, total weight of the bike and many others. Roll forward cannot be measured in numbers. Experienced cyclists can experience and appreciate it. For amateurs, the difference is especially visible if they change, for example, an inexpensive bike for a more expensive and high quality one.

    What determines the roll of the bike

    Frame. There is an expression “rolling frame”. But, it is very difficult to feel the difference between “non-rolling” and “rolling” frames, because clearly noticeable features are characteristic only of very expensive models. Frames made from expensive materials tend to absorb shocks and vibrations.

    Longer frame designs help the rider get a more aerodynamic ride on the bike, which has a positive effect on rolling. But, on a regular bike, rolling from the frame does not depend as much as from other components.

    Wheel size

    One of the main determinants of bike roll. Larger wheels travel 28 or 29 inches faster than 26 inches, so the bike is more rolling. Today’s popular 29ers, with 29 inch wheels, have this quality.

    Tire protector

    Smooth, narrow rubber with no tread rolls best. Worst of all is a wide aggressive tire with a high tread pattern.

    Chamber pressure

    There is a direct link between pressure in the chambers and how easily the bike rides. Insufficiently inflated wheels slow down the bike, and vice versa, chambers filled with air not exceeding maximum pressure give ease of movement. On tires, manufacturers indicate the recommended pressure to which you can swing the wheel.

    Chassis

    For bike components to help you ride efficiently, the bike must be cared for regularly and the chain, sprocket and cassette are kept clean. Timely cleaned and lubricated chain runs smoothly and evenly, providing an easy ride for the bike.

    Depreciation systems

    Bike roll is also affected by the suspension fork, rear suspension, and shock absorber seat post. By absorbing vibrations, they slow down movement. expensive suspension forks and rear shock absorbers are equipped with travel lock systems for driving on asphalt and flat surfaces to reduce the amount of energy absorbed by the shock absorption.

    Aerodynamics

    At speeds above 25 km / h, air resistance begins to affect the roll of the bike. With a headwind, the threshold shifts to 10-15 km / h.

    Bike weight

    It is especially evident when accelerating the bike and on the rise. The longer and steeper the ascent, the more this factor manifests itself. Light bike. easier to ride.

    Also read:

    29 inches. In the 1980s, no fixed wheel standards were defined for a bicycle. The early mountain bike companies Fisher, Kelly and Apps at the time began experimenting with 29-inch wheels to give off-road bikes a second wind and.

    Moments of forces when moving a bicycle. the bike is in a state of dynamic equilibrium. This is achieved with the help of steering: when the bike is tilted, the person turns the steering wheel in the same direction. After that, the bike turns, while the centrifugal force returns the bike to its initial vertical position.

    The physical forces acting when cycling. The fact that a bicycle’s design is simple does not mean that everything is so simple. The physical forces acting when riding a bicycle are based on the fundamental laws of science. Consider the main forces that act when cycling.

    Types of transmission of torque to a bicycle wheel. Freewill. in this design, a special ratchet is screwed onto the sleeve body using a thread. The hooks and pawls are closed and located in the freewheel body. There are only three bearings in the bushing housing, two of them are under the freewheel.

    Aerodynamic tests in cycling. As in the aircraft and automotive industries, a wind tunnel is used to test how the oncoming air flow acts on the cyclist. This expensive device helps to determine the interaction of an object (cyclist) with the air flow.

    velo-travel.com |

    Bike roll and acceleration dynamics!

    Hello! The topic of today’s post is the roll forward and, accordingly, the dynamo of the bike acceleration. We personally, the velo-travel.com team. we believe that rolling of his bike is the most important thing for a tourist! Why then? Because there are several very significant advantages of rolling forward and not a single disadvantage.!

    It will be very important to note that we will consider the roll-forward from a completely different side, not in the way that everyone usually looks at this parameter. After all, the first association with the word “roll forward” is an easy and quick descent from a hill without pedaling. But no! Now we will write something new and non-standard!

    The roll, as they write on the forums and top bike sites, is the distance that a bicycle will travel when it is traveling down a hill without pedaling. Or there is another definition. this is the amount of energy expended on pedaling to overcome the same distance.

    So, on the forums there are a lot of open topics for these discussions, but the sadness of the realities of our life. literally all cyclists from discussing the roll-over go to bragging about their ultra-light bushings, or expensive lubricant. And we will clearly define the term “roll forward”.

    The bike rolls best when it is easy to roll. What does it mean? This means it is much easier to accelerate the bike, maintain average speed much more efficiently, and ride long distances easier.

    And now we smoothly move on to the second open question of our article.

    A parameter such as the roll of a bicycle belongs to the category of serviceable equipment. Everyone understands that if your bike is easy to roll, then the chance to enjoy the ride increases significantly. It is very important!

    Think about it and get the right fit on improving your bike to get the most efficient vehicle possible.

    A good roll is primarily dependent on the tires. which are mounted on the bike. Slick tires are designed for city and highway driving. A rubber with a high tread and aggressively positioned studs is better suited for riding on the ground. For driving on loose surfaces, use extra wide tires with slick protectors. There are some tires that have pronounced spikes, but the center track of the spikes is narrow and flat. With a well-inflated wheel, only the central track, which resembles slick rubber, comes into contact with the surface. This ensures excellent roll-off on asphalt. And if you go on the ground, you just have to lower the tire pressure, and due to the increase in the contact patch, the passability and roll will increase. Yes, yes, exactly the roll. For some reason, everyone thinks that a well-inflated rubber rolls well both on the ground and on the asphalt. When driving through the forest, it is better to lower your slick tire. and you will notice the result. In addition, a heavily pumped slick increases the risk of cutting the tire on a stone or bump. Be careful on the roads!

    If you like to travel only on roads, highways, highways. install narrow slick tires. If you ride only off the asphalt. buy an aggressive tire, everything is clear here. What if you skate both there and there? You never know where the next turn will lead. The bottom line is that there are two ways out of the situation. Either it is the tire described above with spikes, a thin slick track in the middle, or a wide slick. Yes, 2 “wide slick tires are a great option for tourism. The flat contact surface provides good acceleration dynamics, and the wide contact area ensures stability on the track and in the swamp.

    Bicycle suspension is the enemy of rolling! The softer the suspension. the more effort is spent on pedaling. This is why two-pendant bikes are rarely used in cycling tourism. But there are also exceptions. Quality bikes with high-end equipment have travel locks on the front fork and rear shock absorber. They make the bike rigid and rolling in a second. Therefore, if you like to travel in comfort and have an extra pair of green banknotes, you should take a closer look at such bicycles. In addition, the weight of such a bike will not be much higher than the weight of the average country rider. The best option for a tourist would be a country man, equipped with a fork with a lock-out (thus a blocker). In order to keep your hands from getting tired during long driving on rough roads, the fork is unlocked and you can ride in comfort. When entering the track, for the effective use of the expended forces, it is worth blocking the fork. It is important.

    It is not the rubber tread itself that affects the roll, but also the wheel diameter. The larger the wheel, the more it rolls up, but at the same time it is more difficult to accelerate. The essence of large diameter wheels is that it is more difficult to fire it up, but it is much easier to maintain a constant pace. Here’s a simple example for you: a 26-inch slick tire has the same roll as a 29 aggressive wide tire. Think, decide for yourself. And about 29 wheels, we already wrote in our article about wheels.

    READ  Do I need a rear shock absorber on a bike

    Frame geometry also affects bike roll and acceleration dynamics. What frame geometry is considered rolling? In order not to burden you with the theory of sines and cosines, let’s say simply and clearly. the smoother the upper frame tube (the one that goes from the top of the head tube and connects to the upper part of the seat post), the better the bike roll. Better stability on straight asphalt, better dynamics, but much worse off-road performance on a nervous road.

    And finally, this is the state of the bushings. If the bushings are lubricated and adjusted, the bike will ride normally. If you notice a clear decrease in rolling, it is worth going through the bushings, this is definitely.

    And remember, a good bike is a serviceable bike, no matter how much it costs or what manufacturer. Good luck to everyone on and off the road :).

    ljvelo. ljvelo

    rolling is literally the efficiency of converting pedaling energy into motion, and rolling is how far the bike can roll without applying energy.

    Under ideal conditions, there are only two things that affect rolling. the friction in the bushings and the rolling resistance of bicycle tires. In reality, there are slightly more factors.

    Roll on asphalt and hard ground

    On the highway, everything is very clear. a smooth tread and tires inflated with maximum pressure will give minimum rolling resistance.

    Newbies riding mtb around town are very impressed by the difference between a 6 ATM bald slick and their stock mountain rubber. Therefore, if your routes pass through the city and country roads, then put on such tires. you will not regret.

    Any tread other than smooth tread will impair rolling. The pressure must be pumped to the maximum in order to reduce the area of ​​the contact patch of the tire with the asphalt.

    The width of the tire is a little more difficult. on good quality asphalt a narrow tire rolls better, because you can drive more pressure into it. Plus, at high speeds, aerodynamics becomes an important factor, and with narrow tires it is better.

    If the asphalt in the city is not of the best quality, then it is wiser to put wider tires on the bike, personally I prefer the range of 32-38mm, for completely broken surfaces 42mm is suitable.

    The question of which rolls better. a wide or a narrow tire, in this case remains open, it is rather a matter of comfort. it shakes very much on slicks packed to 6-7 atm.

    In especially neglected cities, it makes sense to install a very wide road tire, such as the Schwalbe Big Apple, which perfectly “swallows” potholes in the asphalt, but at the same time has a good roll.

    Which tires roll better on soil, sand and stones

    For a long time I was convinced that the narrower and maximally inflated tires roll better in all conditions. I was inspired by cyclocrossing enthusiasts. more than once I saw them “make” mountain bikes on cross-country trails.

    The theory is that while a soft mtb tire “licks” irregularities, wasting pedaling energy, a hard narrow tire seems to fly over them, keeping roll.

    I found confirmation of this theory in my hybrid rides in the forest. a little behind my friends on mtb in technical areas, I quickly pulled ahead, as soon as something solid appeared under the wheels. the bike flew.

    The conclusion suggests itself. if you pump the ability to ride on narrow tires in difficult conditions, you will get a decent advantage in speed over a mountain bike, losing only in cross-country ability and comfort.

    Probably, this conclusion will be suitable for many Catalans, whose routes pass along mixed roads, where hard soils and asphalt prevail.

    And yet, as strange as it may sound, on the ground, rolling resistance is less for wide and soft tires. This is proven by more than one study and experience of cross country cyclists.

    Obviously, the wider the contact patch, the greater the rolling resistance of the tire, but this is only true for a hard road. As soon as something soft appears under the wheels. earth, grass, sand, dirt. so immediately the wide contact patch rolls easier on such a surface.

    Therefore, to ride in the forest, you should not pump up your MTB tires too much. this reduces the area of ​​contact with the ground and you have to spend more energy on pedaling, despite the fact that subjectively, tires that are pumped up to the stop roll better.

    I want to emphasize that we are not talking about cross-country ability, with which it is already clear that the wider the contact patch, the better it is, namely rolling resistance. Personally, at one time this discovery surprised me greatly, and for a long time I could not believe that this was really so.

    All my experience spoke of the opposite: an inflated wheel rolls briskly, with a quick response to pedaling, and a lowered one. as if you are kneading a porridge, the pedaling energy goes somewhere.

    My doubts were dispelled when I put tubeless wheels on my mountain bike and inflated the lowest pressure (within reason). After a couple of days of testing, I had to admit that heavily inflated tires are not the best option for the forest, even with the powerful health that allows you to come off on “hard” sections.

    Despite the fact that on straight sections with hard ground it was no longer possible to break in the same way as on cyclocross 32mm rubber, but it turned out that the distance traveled faster (and, importantly, with a lower pulse) on soft wide tires.

    Add to this the fact that a weakly inflated rubber with a wide contact patch, in addition to better rolling on the ground, has much better grip, a soft tread “licks” stones and roots. That is why fat bikes are great for rolling on loose, mud and stones.

    Larger wheel rolls better

    Already many axes have been broken about the topic of niners, whether they really roll better than regular 26 ″ bicycles, but for the sake of order, it is necessary to mention the fact that a large wheel, other things being equal, rolls better.

    And the worse the road, the more stones, cracks in the asphalt and other irregularities under the wheels, the greater this difference will be.

    I clearly notice this effect on my folding bike with 24 ″ wheels. it rolls on smooth asphalt no worse than a hybrid, but on a bad one it loses speed much faster.

    What does not affect the roll of the bike

    In my opinion, friction in bushings has vanishingly little effect on rolling. I know that beginners are worried about the wheel spinning absolutely free and stopping with the nipple down, and are very upset if this is not the case

    Believe me, if the bushing is in good working order, if the bearings have enough grease (no more, no less), if the cones are not overtightened, then it does not matter at all how the wheel spins without load. you will not be able to feel the difference on the go.

    There is also no difference in rolling between the types of bearings. tapered or industrial, in a closed housing.

    One more thing. it is believed that the rider’s weight influences the roll, supposedly the harder the rider, the better the roll. In practice, this is true only when driving downhill.

    As a rule, the climb and drop of altitude in ordinary pokatushki is the same, so how much energy “saved” on the descent, so much spent on the ascent.

    The same is with inertia. sometimes they say that a heavy cyclist only needs to accelerate, and then the bike rolls by itself. This is not so. most often this effect is felt if the road has an imperceptible slope.

    What is Bike Roll or Is Your Frame Rolling?

    If you are asked a question whether your lead is rolling or not, and you do not quite understand what, in principle, it is talking about, this article will definitely be useful to you. We will tell you what a good roll means and how to determine it.

    Does it roll great

    Bicycle bikes with the same attachment may well have a cost that is two times different. The only difference is the frame. Perhaps a bike from an unknown company was better than a branded one? Let’s figure it out. Roll refers to how well the rider’s strength translates into the distance traveled. This figure can be influenced by factors such as driveline loss and those that affect the friction between the bike’s tires and the ground. Since the roll is measured directly by the rider’s own feelings, and not by any research conducted in the laboratory, the right decision is to discuss all the points.

    Losses in transmission

    These losses can be minimized by changing gears correctly and with the proper equipment on the bike. This factor can be considered the least significant, since losses can only amount to about ten percent. over, they largely depend on the power. If you are not a master of sports, but properly maintain your iron horse’s transmission and shift gears correctly, transmission losses can be neglected for now.

    Aerodynamic losses

    Few models of bicycles are rolled in wind tunnels. The engineers of the so-called racing bikes follow this procedure to save on aerodynamics. This effect is especially noticeable at speeds exceeding the threshold of 30 kilometers per hour. In normal riding, more importance should be given directly to the fit and equipment of the rider. The more stretched the fit, the lower the resistance will be.

    Friction indicators

    Friction between the road surface and the bicycle tires is of no small importance. The larger the contact patch and the lower the pressure, the higher the friction values ​​will be. However, there is no need to pump rubber, because this can also have negative consequences.

    Center of gravity

    The shortest path of the center of gravity is most likely the main point that affects the roll. This value depends on the pressure in the tires, rims, spokes and frame. It is rubber that has the greatest impact. The roll can be easily killed with a mud tire. It should also be taken into account that when driving on paving stones, it will be much better to roll rubber at reduced pressure, but for soft soil, tires with high pressure are the guarantor of rolling.

    Many people think that the softer the bike is, the better the roll will be. But this is completely wrong. On an even asphalt surface of a cycle track, a two-suspension bike or a hardtail will wobble somewhat, even in the case of an ideal suspension. However, thick tires can also lose roll when pedaling hard.

    Deformation loss

    This is a pretty important roll forward point. When power pedaling, professional riders can damage the frame while standing. A very soft frame will inevitably have torsional losses. During pedaling, it will begin to “play”, and as a result, the bike will definitely not “roll”. Therefore, it is very important for engineers to combine the high strength of the frame, which can withstand serious loads without problems, and the minimum weight, thus achieving the best possible transfer of power to movement. This must be done taking into account the rider’s weight and fitness.

    Many beginners think of rolling as the distance that two bicycles travel at the same starting speed until the brakes are applied. However, this indicator is often influenced by the rubber and the pressure in it. Also important is the position of the rider in the saddle of the bike. Therefore, it would be more correct to consider the combination of torsional stiffness and vertical softness, which corresponds to the road surface, as coasting.