Setting up the rear derailleur
The first step is to put the chain on the smallest sprocket in the cassette. This can be done using the right shifter. it is this detail that directly affects the rear derailleur on the bike. To release the cable, you need to unscrew the screw that fixes its position. The screw marked H must be unscrewed with a screwdriver so that the smallest sprocket is in the same plane with the sprockets in the foot. Next, the cable must be pulled and secured with a screw.
After that, you should definitely check the work of the transfer. If the chain does not switch to large rollers (stars), then the cable must be tightened even more, using the drum already on the shifter or on the transfer. The chain is moved to the largest roller and the position of the switch is adjusted with the screw L. Ideally, the cross-over should not be able to hit the knitting needles, that is, the foot and the star should be in the same plane.
How to fix defects?
Every speed bike must have an attentive owner. That is, all parts. cable, sprockets and switches. must be lubricated with special means. lubricants.
If the cable is stretched, it can be slightly tightened. In the event that it has already been torn, it should be immediately replaced with a new one. Algorithm of actions:
If the spring does not work well enough, then it must be rinsed with water and lubricated.
Rooster deformation can be seen not only in special bike shops. A bent cock is visible if you place the rear derailleur frame obliquely. In case of slight deformation, it can be leveled independently by pulling it out until the hind foot is level. However, remember that this is only a temporary measure. It is best to replace the deformed part with a new one. The same goes for the bent crossover.
Possible causes of indistinct / incorrect speed switching
Before talking about how to adjust the speeds on a bike, let’s talk about the possible causes of such defects:
Let’s define the terminology
Before talking about such a concept as adjusting the speed of a bicycle, you need to understand the basic definitions so that even a novice cyclist understands what is at stake.
The speed selector is sometimes referred to as a toggle. It is an indispensable component of any modern speed bike. It looks like a rectangular spring mechanism with a frame (or foot) attached to it. Speaking of the speed switch, it is impossible to ignore the shifter. a device that is designed to control the shifting by adjusting the cable tension. Usually this important part is attached directly to the handlebars. But there are bicycle models where the shifter is located on the down tube of the front triangle of the frame.
Every seasoned cyclist knows what a rooster, cassette and speed bike system is. For the rest, we will give definitions to these terms:
How to adjust the speeds on a bike without fixing screws? The two notorious switches marked H and L are right on the cross-over. The first is the Hight, which is a limit screw for adjusting large gears (or small sprockets or gears). L (Low) adjusts small gears. Their location may vary on different models.
How do I adjust my bike speeds? How to adjust bike speeds?
Despite the fact that the derailleur has a primitive mechanical design, adjusting it can be quite difficult for cycling enthusiasts. Read this article to learn how to set your bike speeds and learn how to use the derailleur correctly.
How to adjust bike speeds?
On modern models of these vehicles, there are two speed switches. front and rear. Usually, the adjustment begins with the latter, but there are also cases when it is necessary to adjust only one crossover.
Adjusting the front derailleur
This algorithm of actions will tell you how to adjust the speed on the bike by setting the front overhaul:
After reading this article, you will know for sure the answer to the question of how to set the speeds on your bike. The main thing is to follow the above algorithms of actions, and the process of adjusting the speed switch will not seem so difficult to you.
How to properly set your bike speeds?
The popularity of two-wheeled eco-friendly vehicles is beyond doubt. Bicycles with speeds have become especially popular. But, the pleasure of riding is obtained if the bike rolls easily, without making any extraneous sounds. Therefore, the question of how to set the speed on a bike correctly is relevant for many cyclists.
If you need to make the settings yourself, you need to read the instructions, which are easy to find on the Internet by specifying a specific bike model in the search box.
What you need to know about customization?
Setting the speed on a bike begins with adjusting the height and angle of the front derailleur, which should not touch the gears, as well as be far from them. It is correctly fixed if it is 3 millimeters higher than the toothed largest wheel. Adjust the angle, means the switch needs to be set parallel to the rotation of the wheels.
The following bolts are used to adjust the gear shift:
Putting the chain in the extreme left position, disconnect the cable by unscrewing the nut that holds it or the bolt. After that, proceed to adjusting the gears, ensuring that they are on the same straight line, for which they tighten the bolt (marked “High” or “H”) indicated in the picture. After finishing the adjustment, we tighten the fixing cable with the screw again.
For further adjustment, put the chain in the extreme right position, i.e. the largest at the back and the smallest sprocket at the front). Adjust the gears with the “Low” or “L” bolt until they are in line.
That is, at the first stage, the maximum speed is adjusted using the screw indicated by the letter “H” and the smallest gear wheel, trying to put the wheel and the switch roller in parallel.
The next step is to tune the largest cogwheel corresponding to the lowest speed. To do this, we tighten the screw on the switch, marked with the letter “L”, again trying to position the roller and this wheel in parallel.
Then you need to set the position on the switch lever that will correspond to the highest speed.
Next, we adjust the rear derailleur, for which we install a chain on the small gear wheel and the largest rear gear. Scrolling the pedals backward, adjusting the chain tension with a screw, bring the upper roller (as close as possible) to the gear wheel. This is necessary for smooth gear shifting.
After setting the front switch correctly, you can proceed with the configuration. Now we put it on a large rear sprocket and a small front.
Achieve a distance of 1 mm between the frame and the chain. To do this, first loosen the control cable for adjusting the screw L, then fix it with a screw.
Finally, move on to fine tuning by moving the chain to the center position on both sprockets. Use the screw highlighted in the photo. Both gears must be in the same plane.
It is recommended to tighten the lamb shown in the picture after the test drive: if the gear does not change or jumps over the sprockets, the chain.
Important: when the stars are lined up in one line, a deviation of a few millimeters is allowed. But, because of this, gear changes are worse. Test run-in will help to identify all the shortcomings.
When to adjust the speeds?
- if the cable is stretched or torn, the transmission of commands from the coin is disrupted and there is a need for adjustment;
- wear of the return spring located on the cassette leads to the performance of functions not in full (failure when switching speed, etc.);
- deformation of the “cock” or derailleur resulting from aggressive driving.
About setting places
The cyclist’s speed changes depending on the situation, therefore the coin, the signal from which goes to the speed switch, which throws the chain onto the rear sprocket of the bicycle, should be within his reach, i.e. on the frame or handlebar.
The bike has two derailleurs, one in the front and one in the back. They are also responsible for maintaining the optimum chain tension. The derailleur resembles a parallelogram with springs and rollers that guide the chain.
It sits on the bike frame and is held in place by a device called a “cock”. a metal holder that prevents damage to the derailleur.
Directly involved in the selection of gears is a cassette or a rear set of a bicycle transmission, which consists of gear wheels of different diameters installed on the rear wheel.
There is also a front drivetrain set, also consisting of gears of different diameters. It is mounted with cranks that hold the pedals necessary to drive the transmission on the bicycle axle (in front of the frame).
How To Do 6 Speed To 7 Speed Freewheel Conversion
What tools are needed to tune bike speeds?
Usually they all come with a bike: pliers, a screwdriver, a set of hex keys or open-end.
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How to set up the correct shifting of the forward gears?
Carry out the adjustment by analogy with adjusting the rear shift using a metal stop and two bolts shown in the photo below.
The final gear setting is carried out on the front derailleur, when the chain in front is on the large gear wheel, and on the small one at the back. This operation is carried out with a screw H until a distance of 1 mm is achieved between the chain and the frame.
A test drive will tell you if the setting is correct.
If it is difficult to shift at low speed, you need to adjust the cable on the front derailleur. If the chain is difficult to move to the large wheel. adjust the cable tension on the same adjuster.
In order for the bike’s gear shifting to always be effective, there must be a derailleur and a cable in good condition, on which the operation of the latter depends.
You need to tighten the cable using the drum located on the coin. In order for the cable to work properly, it must be lubricated periodically. The sprocket chain also needs to be lubricated to keep noise free when cycling for easy shifting and less friction.
You can determine the state of the “rooster” visually or using a special device. It can be easily repaired or replaced by checking if the switch is deformed, in which the parallelogram is considered to be the weakest point.
During the operation of the bicycle, the screw that regulates the chain tension may fail.
How to properly switch gears on a bike?
Bicycles designed for sports or walking are equipped with a multi-speed transmission, so the biker has the ability to change gears depending on the situation on the track. Manufacturers produce 18,21,24, 27-speed bicycles. However, from most beginners you can often hear that in so many gears on a bike they are intimidated, they get lost and do not imagine how they can confidently cope with so many speeds.
Let’s first figure out why you need gears on a bicycle, as well as how many of them there can be.
It’s simple enough. the gears on the bike are needed to keep your knees healthy and comfortable to ride. With their help, you should set your optimal cadence, that is, the cadence per unit of time and the pressure on the pedals. This will allow you to optimally spend energy, save your bike and health. Your cycling will be extremely productive in any terrain.
The optimal number of revolutions per minute is individual for the biker and depends on many factors. his physiology, age, experience, riding style and terrain. On average, beginners are recommended to cadence 80-100 (110) rpm.
Now let’s figure out why we need gears on a bicycle in such an amount, because this is not a motorcycle or a car.?
In reality, experienced bikers ask you not to be intimidated by multi-speed cycling equipment, because as soon as you learn how to pedal correctly, then not everything will be involved in your work, for example, 27 speeds, but almost two less.
So how do you know how many bike speeds you have? It depends on the number of stars, on average, manufacturers like to produce 21-24 speeds, that is, when there are 3 gears on the front wheel and 7-8 gears in the rear.
How is the mechanism for gear shifting?
On a modern mountain bike, there is usually a system of 3 stars of different sizes in front, a group of stars, the so-called cassette, is also provided at the back, but there are more stars, from 6 to 10.
The system in front consists of:
- A small star, which is responsible for climbing uphill at low speed, but gives a lot of thrust;
- An average star, also called a marching or walking star. As a rule, the largest part of a cyclist’s path passes through it;
- Large sprocket designed for driving on asphalt, flat surface. Wherever serious effort is not needed, it allows you to drive with great power at high speeds.
The set of stars placed at the back has the same logic, only the size goes the other way around, from the largest, which is closer to the frame, to the smallest outer.
How to Properly Adjust Bicycle Shifting
Gear shifting is assisted by mechanisms on the handlebars called shifters or shifters. Most of the shifters have a trigger shift mechanism, some hybrid bikes are equipped with shifters like a rotation handle, and more advanced ones have a shifter combined with a brake lever.
Trigger shifters are controlled using levers, and grip-shift is a turning method, this is in more advanced bikes. There are two levers for each shifter, for downshifts and upshifts. The trigger mechanism is as follows. the voltage from the shifters is transmitted through a cable to the switches that are installed on the wheels. The rear group of stars changes the position of the chain on the stars using the rear derailleur, for the front system there is a derailleur in the front.
The shifters can have dials that show which gear you are currently in. In some models, the dials are replaced by a mini-display. Novice cyclists often look at shifters, and experienced cyclists, by the way the pedals move, feel in which gear they are currently riding.
Please note that if you have two switches on your wheels, front and rear, then there are also two shifters on the steering wheel. If you have 3 stars in the front system, and 8 stars on the rear, then on the shifter, which is responsible for shifting gears in the front, there will be three divisions, for the rear mechanism, respectively, 8 divisions!
How to use the switch correctly?
To avoid increased wear on the cassette on the rear wheel, chainrings on the front, chain breakages and not to damage the gearshift system of your bike as a whole, you need to know a few basic rules for shifting gears. So:
When changing speeds on a bicycle, you should not allow maximum chain skew, for example, such a position as in front of 1. behind 8, and vice versa is unacceptable.
Please note that the stars are numbered from the frame!
Using the example of a 24 (38) high-speed transmission, we will show how to combine gears:
The lightest gear is when the stars are in the 1-1 position. In the process of riding, you should strive for a larger number, increase power and speed, but do not resort to the maximum increase in movement often, as this is an additional load on both the transmission mechanism and the joints of the legs.
The main guideline is that pedaling should not be difficult for you, but also not very easy, the effort should be comfortable.
Experienced bikers advise: the difference between the speeds should not be more than 4!
When you decide to change gears, especially for chainrings, you should definitely reduce your effort a little and not push hard on the pedals. Why? The fact is that the front group of stars works with the upper part of the chain, which at the moment of movement experiences maximum tension, therefore it can break if you change the position of the speeds without stopping to pedal with effort.
Switch should only be done when you are on the move.!
Need to switch multiple speeds at once? Do it in stages, don’t skip.
Also, when shifting, you need to squeeze the lever of the shifter as much as possible, which is responsible for the front group of stars.
How do you know if you did everything right? A great way to find out if you have learned how to change gears is to listen, if the chain is laid down correctly, then you will not hear any extraneous sounds in the form of clanging or crackling. of course, provided that you have the chain in proper condition, it is lubricated. not old and so on. The only thing a cyclist can catch is a small click.
How to catch and feel the moment when you need to switch gears on your bike? An important condition for this is to learn to focus on your own feelings, if you don’t have enough strength and you started to pedal idle, then it’s time to switch to the next speed.
So, when the answer to the question of how to change gears on a bicycle has become clear, you need to get as much of your own experience as possible in order to begin to feel the moment when and how you need to change gear. To do this, ride in different conditions, for example, on a highway, go up and down a mountain, feel how the revolutions of each wheel change with changing speeds on a bicycle. Exclusively in this way, you will hit your experience with the bike transmission, learn how to pedal with the optimal cadence for you.
Consider the physical fitness of a cyclist.
Cadence is the cadence at which the cyclist rides. Ideal for long-term travel is stable cadence, i.e. if the pedals rotate evenly throughout the path, and the uneven terrain, the headwind is compensated for by means of speed combinations.
But if endurance is important only over long distances, then at any time you should keep in mind the health of joints and muscles. Many novice riders overload the knees, giving maximum effort on every crank revolution. This not only tires and damages the muscles, but with prolonged repetition it will affect the health of the knee joint. Professionals use stable and frequent movements without serious strain on the legs. This mode is the safest for both cyclists and bicycles.
Training and preparation
It is recommended to use low gears to prepare for driving at the start of the day or season. For the first 10-20 minutes of a long ride, the legs need a “warm-up”, for which the ideal cadence of 60 rpm (movements per minute) and the minimum load. ie. speeds with 1 and 2 chainrings.
A similar recommendation in a more global sense. the first hundred kilometers of the season, especially on a mountain bike, should be overcome in low gears so that the legs “remember” skills and are not damaged by too serious changes in daytime load.
How to properly switch gears on a bike
In fact, cycling gear shifting is a trained art that depends on the rider’s physical condition, long-term training, and the design of a particular bike. Consider various factors in this article.
Speeds and stars
The first derailleur bikes were models such as the Tourist, the massive heirs to 70s sports bikes. They did not have a front derailleur, but the cassette allowed you to select one of four speeds.
Over time, the number of available speeds grew, and now bicycles with 18, 21, 24 and 27 values are becoming the de facto standard. Usually this is a combination of 3 stars on the front derailleur and 6-9 on the rear, in a combination of 3 and 7 stars, 21 speeds are obtained. Some high-speed models have already acquired 10 stars on the rear derailleur, but so far this is a rarity.
Actually, “speed” is a star, and the total gear ratio is obtained from a combination of the current stars selected by the front and rear derailleurs.
When it comes to gear shifting, these are almost always standard derailleurs, but there are other models, for example, planetary hub and “hello” from the automotive world. automatic transmissions.
Of course, manufacturers do not live quietly in a stable market, and they are looking for new uses for their engineers’ talents. So, for a long time, the top firms Shimano and SRAM have been producing small batches of automatic gearboxes, where, using electronic sensors (Shimano Nexis, Auto, etc.), they switch speeds in the planetary hub.
There are also rare models with automatic gear shifting on a mechanical basis. the rotational speed is determined by the centrifugal force of the load, which is why the mechanism changes the gear ratio.
Despite the fact that nominally there can be 27-30 speeds in the transmission, i.e. combinations of sprockets, not all of them are recommended to be used, as they are dangerous for the mechanisms of the bicycle. Why is this happening? Not all stars are in the same plane, which means that when they are combined, the chain experiences a load at a small angle, which causes additional friction and, as a result, bending of the links, then stretching of the chain and subsequent damage to both the chain and the stars.
The basic rule is the approximate parallelism of the chain of the plane of the stars, without distortions. In numbers, for the current classic 24-speed mountain bike, the value on the rear derailleur should be between double and triple the value on the front, with a few exceptions at the edges, such as combinations 1-1. Those. out of 24 options, it is recommended to use the following gearshift scheme:
- On 3. the largest chainring. reverse speeds 6, 7, 8.
- 2 stars. rear 6.5.4.
- On 1 star. rear 1,2,3.
Of course, these rules may be violated depending on the conditions, but they have already become a generally accepted standard.
Correct switching does not require much knowledge. Almost all bicycle models are equipped with a cable that brings the force from the shifter. the derailleur control element. to the derailleur itself.
When the cable is pulled, the derailleur frame moves and transfers the chain to a chainring of a larger diameter; when released, it falls or moves to smaller stars. These actions are performed without auxiliary mechanisms, using the flexibility of the chain and friction with the switch frame, i.e. the chain and all elements are under stress; transmissions are not provided for in normal operation. Because of this, there is a recommendation not to switch gears under load or without movement.
Preparing to set up the transmission
It is wrong to start adjusting the gearshift system right away. The bike has been on the road for some time, therefore, there is a certain amount of adhered dust on the chain. Be sure to remove all the dirt from it, lubricate the rollers, sprocket points and the switches themselves. Sometimes problems with a tight transition from one speed to another lie in the dirty chain. If, after cleaning and lightly lubricating, the problem is resolved, then you do not need to adjust the switches.
Next, pay attention to the drive cables: they must be flat, without bends. Otherwise, they will have to be changed. Inaccurate shifting and jumps may be due to faulty cable.
Another preparatory procedure is to inspect the cock near the rear derailleur. The rooster must be in an upright position and strictly in the same plane with the rollers. You can align it, but it’s better to change it to a new one.
As for the bike’s front cassette derailleur, here you need to make sure that the inner frame is parallel to the chain travel. The distance between the largest sprocket and the outer frame of the switching device must be within 2-3 mm.
Everything is all right, and the speeds keep turning on badly? Then it’s time to adjust the transmission. We loosen the tension of the cable to the maximum, tighten the drums on the switch until they stop. After adjustment, the system will work more accurately, and there will also be a necessary margin in case of lengthening the drive cable.
Rear Shift Adjustment
The standard and common drivetrain, such as on a mountain bike, is a chainring at the bottom bracket and at the drive wheel with appropriate derailleurs. It is necessary to start tuning the system from the rear sector of the gearshift system.
- setting the limitation of the chain travel along the cassette;
- overdrive adjustment;
- changing the position of the tensioner.
It is necessary to adjust the travel limit to prevent the chain from falling off the sprockets. This procedure is performed by tightening the L and H screws with the high and low gear adjusters. You need to turn the screws until the rear sprockets corresponding to them lie in the same plane with the limit rollers. Step by step, this process looks like this:
- Set the extreme position on the stars: the front is the largest, the back is the smallest.
- Loosen the rope.
- Turn the screw H to achieve complete coincidence of the rollers and the small sprocket in the same plane.
- Return the cable to the derailleur and set the opposite position: the front is the smallest star, the back is the largest star.
- Rotate the L adjuster until the stops are aligned with the large rear sprocket in the same plane.
Chain transfer quality is the most important characteristic of transmission performance. Accuracy and transition speed are controlled by the following mechanism:
- Set the system to “small star in front and small in back”.
- Rotate the cable adjustment drum, tightened to the stop at the beginning of work.
- The correct position of the drum is determined and, accordingly, the degree of tension of the drive.
How do you find this optimal position? With a weak cable tension, the chain will not jump well to large stars. An overtightened drive cable results in poor transition to small (higher) stars, accompanied by a sharp clang. To strengthen or loosen the tension, we twist the drum counterclockwise or clockwise. Don’t forget we’re talking about the rear derailleur.
Well, the last step in adjusting the rear speeds on a bicycle is adjusting the position of the tensioner. In the front we activate the smallest one, and in the back the lowest one and rotate the chain tension screw. The distance between the deflection roller and the sprocket should be between 3.5. 4.5 mm. A vernier caliper will help to accurately measure this distance.
How to properly adjust your bike’s gear shifting
The gearshift system is one of the most vulnerable parts of a bike. Transmission components are susceptible to wear and tear and imbalance, which requires repeated adjustments during operation. The main symptoms of speed discord include difficult shifting while driving and chain jumping over one or more sprockets.
If the above signs appeared suddenly, and the quality of all components of the transmission is not in doubt, then it is necessary to adjust the speeds in the rear and front sectors of the gear shift. It is not worth neglecting the adjustment, since over time the stars will experience increased wear, the chain will begin to fly off, and it will be completely inconvenient to ride. The procedure for setting the speeds on a bicycle is not difficult and can be done at home.
Setting the chain hop limits and quality on the front derailleur
The next part of tweaking the transmission is adjusting the front derailleur. The work includes debugging the accuracy of the chain travel limits using the H and L-screws, as well as the speed of the chain transition when gears are engaged.
If it was correct to start from the rear with the high gear limiter, then here first the position of the roller is adjusted from the side of the lower gears:
- The chain is transferred to the “lower front, higher back” position.
- The cable is detached from the derailleur.
- By turning screw L, the minimum possible distance of the chain from the inner frame is achieved.
- The cable is put on and pulled by the drum adjuster.
Setting the correct limiting with screw H differs from the L-setting by the reverse position of the chain on the stars (smallest in front and largest at the back) and the approach of the chain to the outer frame of the derailleur.
How to Adjust the Accuracy and Response Speed of the Front Derailer:
- We turn on the top gear from the front.
- We consistently transfer to lower gears.
- We tighten the cable if the chain is tight and slow.
- We reach the lowest star and switch in reverse order.
- We loosen the tension by turning the drum if the chain does not go to higher gears.
When tuning, it is necessary to achieve fast operation of the switch on all stars. Initial position of the chain at the rear: when checking for insufficient tension, the smallest sprocket, and for excessive tension, the largest sprocket.
It is on this simple principle that the front and rear parts of the transmission are debugged. Quality parts such as shimano rarely need adjustments and last a long time afterwards. In any case, it is quite possible to fix the imbalance problem with your own hands without going to the workshop.
High gear limiter adjustment (H)
- the chain is installed on the largest sprocket in the front and the smallest in the back;
- turn the screw H to find the optimal position in which the chain will be as close as possible to the outer frame of the switch, without touching it.
Operation: how to tune the front speed row on a bike with two or three sprockets
Setting up the front derailer occurs only after debugging the rear derailleur. Before starting the process, you should definitely check two parameters here:
- parallelism of the inner frame of the chain;
- the gap between the largest sprocket and the outer frame of the dereiler (should be about 2 mm).
The procedure responsible for the task of how to adjust the forward speeds on a bicycle includes three key transitions.
Low gear limiter adjustment (L)
The procedure is performed in the following sequence:
- the chain is installed on the largest sprocket in the front and the smallest in the back;
- the cable is disconnected from the dereiler;
- by rotating the screw L, it is necessary to ensure that the chain, when rotating the pedals, moves as close as possible to the inner frame, but does not touch it;
- the cable is stretched and fixed.
Adjusting the transfer quality
The answer to the question of how to adjust the smoothness of gear shifting on a bicycle is quite simple. By rotating the adjusting drum, a dead zone is found, in which the movement of the dereiler, both from upper to lower gears, and vice versa, will occur instantly and without delays. By twisting the drum, the switch will move more efficiently from small to large stars. When spinning the drum, the exact opposite dynamics is observed.
For your information. After adjusting the transmission, you should check the quality of functioning of the components under load. Most likely, you will need to adjust the cable tension using an adjusting drum!
Adjusting the transfer quality
It is a key operation in the process of how to adjust the rear speed range of both road and mountain bikes. The process technology is simple: the smallest sprockets are installed in the front and rear; by rotating the adjusting drum, they ensure that the transfer is triggered clearly and instantly:
- in case of insufficient tension of the cable, the switch poorly (slowly) switches to lower gears (large sprockets). it is necessary to turn the drum counterclockwise;
- with excessive tension. the derailer stays in the same position (it does not go well into the upper gears. small asterisks), emitting a clatter (metal clanks) during operation (the drum must be turned clockwise).
Operation of the transmission: how to correctly switch speeds on a bicycle in various conditions
Maintaining cruising cadence when driving on flat, flat areas or pedaling confidently and effortlessly on rough terrain. the transmission unit of a modern bicycle is able to maintain the gear ratio most suitable for an athlete.
Experts give the following recommendations on how to properly switch speeds on a bicycle:
- change gear only while driving;
- switch to the required sprocket only under conditions when the minimum load acts on the chain (it is advisable to reproduce this process at a high cadence);
- do not change gear when overcoming ups / downs (suitable stars must be selected in advance);
- in muddy, sandy and slippery areas, move in higher gears (deliberately increase torque to avoid loss of traction).
For your information. When driving on asphalt areas, due to the physiology of the knee joints, the cadence should be kept at 80-110 rpm. In some cases, it is allowed to reduce the cadence to 60 rpm.
With the correct implementation of the sequence of actions in the process of how to adjust the gear shifting on a bicycle, the following requirement should be attributed to the main limitations of the gear selection process. to exclude the skew of the chain, which significantly reduces its service life. You can avoid the latter, using the example of a 24-speed system, as follows:
- a small sprocket (1) is installed at the front, at the rear: 1. 4;
- front. middle (2), back: 4. 6 (7);
- front. large (3), back: 6. 8.
Performed, as a rule, once. when installing a new derailleur and in order to prevent the chain from jumping off on the outer stars of the cassette. The sequence of actions is as follows:
- the largest star is installed in front, the smallest one at the back;
- the cable is released;
- adjustment is performed by turning the screw H clockwise or counterclockwise (the frame of the dereiler moves, respectively, to the spokes or to the frame feather) until the rollers with the smallest cassette star lie in the same plane;
- after that, the cable is pulled and fastened, the switch is transferred to the largest star in the back and the smallest in the front;
- by turning the screw L, they achieve a similar position of the rollers in relation to the sprocket.
Tensioner adjustment (guide roller height or chain angle)
In the technology “how to adjust the rear speed on a bicycle”, this adjustment is aimed at, all other things being equal, to improve the quality of gear shifting.
The smallest sprocket is installed at the front, the largest at the back. By turning the screw, the idler roller approaches or moves away from the sprocket. The task is to achieve a gap between the roller and the sprocket of 3-5 mm.
What does “shift gear” mean??
Gear shifting is a chain transfer from one chainring to another. Thus, the gear ratio and the force “on the pedals” are changed.
First of all, for comfort. Gears allow you to save power and choose a comfortable pedaling mode based on:
- The relief of the road (plane, ascent or descent, acceleration or smooth braking);
- The quality of the road surface (highway, country road, mountains);
- Required speed;
- Weather (tailwind or headwind);
- The physical condition of the rider.
How many bike speeds do you need and how to switch them?
A common but diminishing misconception that the more speeds the better.
Need to ask the question which is better? Or who is better?
Today you can find solutions from 1 to 33 speeds. In various combinations: 1×7, 1×11, 2×9, 3×10 (the first number is the number of stars in front, the second number is the number of stars on the back of the cassette). Multiplying these numbers, you get the maximum number of speeds that you can “turn on” while riding.
With the right gears:
- Move faster and more economically (in terms of physical strength);
- Get a longer service life of the bike components;
- Reduce stress on knee joints.
And also go faster downhill, climb uphills with less effort, or drive at a comfortable constant speed.
Rear on the cassette, if the bike is multi-speed, usually from 5-11 stars. So transmissions are 7/8/9/10/11 high-speed.
If the bike has 6-7 speeds, then it has one front sprocket (gear) and a rear cassette of 6-7 stars. If 18 or more. there are 3 chainrings and a rear cassette of 6-7 stars. Sometimes the rear cassettes are 9-10-11 stars, which allows you to bring the number of speeds up to 27-30.
Why did everyone want to make faster speeds before??
It was considered, not unreasonably, that the greater the gear ratio on a particular bike, the more accurate the gear can be selected for a specific terrain. It really is.
However, today they still came to the conclusion that it is possible to do with fewer sprockets on a bicycle. Thus, greatly saving weight, since the extra stars in the front and the front derailleur are removed.
Why does the chain not fall off one sprocket in front?
The development of recent years is a special Narrow Wide chainring with a variable and higher cross-section of teeth, as well as a special rear derailleur that dampens all irregularities. All this together eliminates the need for a chain damper on the chainring.
The tendency is that the higher the class of the transmission. from 7 to 11 speeds, the more expensive it is.
- 7-9 speed bikes are put on the most affordable bicycles;
- 10 speed bikes can be found on middle class bicycles;
- 11 and even 12 speed versions are found on professional models.
The more stars there are in the cassette, the closer they become to each other and the chain will be thinner. From this, the price of such a product will be higher, and the durability is lower.
What do the numbers mean in the description of the transmission 48x36x26T?
They represent the number of teeth on the sprockets. If you are a beginner, then the information is almost useless for you as there is nothing to compare with. But if you are already an experienced bike enthusiast, you can choose a new transmission or bike according to your preferences based on the experience of previous bicycles.
How to properly switch gears on a bike
If you want your chain and sprockets to last as long as possible, it is recommended that you switch at minimum load. To clarify, shifting in the middle of a climb puts a very heavy load on the transmission, which can lead to situations up to a switch breakage or an open circuit.
Also try to shift early and avoid excessive chain skew.
After riding for a while, whether you lubricate the chain or not, attention to the drivetrain may be required. The chain may stop switching perfectly as at the very beginning. Problems can be as follows:
- The gearshift cable is stretched. you need to pull it up with a special lever on the shifter or switch;
- The cable jacket has accumulated too much dirt. it is better to replace it together with the cable;
- Rear derailleur not tuned. requires tuning, better in a workshop.
What types of steering wheel switches are?
They switch gears with special handles on the steering wheel. shifters. They are:
- rotary. gears are switched by turning the knob;
- (revoshift and grip-shift, grip-shift). when you rotate the handle towards yourself or away from yourself, the speed is switched.
- lever. gears are switched by special levers.
Dedicated finger levers. One switches to a higher speed, the other to a lower one. These shifters are more convenient for many cyclists, less whimsical to maintain, but often more expensive.
Typically, the left shifter is responsible for shifting the three front gears, and the right shifting the sprockets in the rear cassette. Thus, the left derailleur and chainrings are used to adapt to the main type of terrain. And the right one for private and short-term changes during the trip.
professionally speaking, changing the speed changes the cadence. Cadence is the cadence and the required pressure applied to the pedals by changing the gear ratio between the wheel and the pedals. Cadence is important in terms of strength and health benefits to evenly distribute the energy expended in pedaling.
The optimal cadence is considered to be in the region of 60-100 rotations per minute.
If you are riding uphill or on uneven terrain, you need to make a lot of effort to pedal, which, for a long time, can lead to arthritis. Turning on a low speed will make it easier for yourself to pedal, reduce stress on muscles and joints, but the bike will go slower.
On a flat track or when descending a mountain, you must turn on a high speed, then more effort will be required to pedal (compared to models without speeds or other gear), but the two-wheeled horse will become faster, more stable, it will move smoother and more stable.
So how many speeds do you need to be happy??
Let’s answer this question as follows. As in the article, how much does a good bike cost, we will note that it all depends on the use of the bike and the place of riding.
If you only ride on paths in a park or sidewalk, you really don’t need speeds on your bike. But fans of cross-country driving, long journeys with alternating ascents, descents and flat areas, real athletes will appreciate this parameter.
For city and folding bicycles, there is no need for more than 7-9 speeds. For them the thesis “the more the better” does not work.
For mid to high end mountain bikes, 1×10, 1×11 (One star front and 10-11 rear) solutions are already available today. At the same time, “only” 10-11 speeds are enough even for mountainous terrain. On more affordable bikes, options like 2×10, 3×9 are more common.
For amateur riding, 18 speeds are enough. Driving in a city, park or woodland is less demanding on gear ratios.
How to determine the speed of a bike?
What speed can you develop on a bike??
It is worth remembering that many factors affect the speed of the bike, which we will discuss a little later. In general terms, the average speed that an ordinary amateur can maintain on a straight line fluctuates in the range of 25-30 km / h on a road bike and below 20 km / h on a mountain bike. At the same time, the maximum speed in a straight line can reach 40 and 30 km / h, respectively.
How does the type of bike affect speed??
The geometry of the frame, the size of the wheels, the width of the handlebars, the weight of the parts. all this not only affects the riding speed, but also determines the type of bike and the purpose for which the bike should be used. We will tell you about the most popular models, their properties and possible speed.
The city (walking) bike is designed for riding on a flat road or a relatively smooth forest path. The frame geometry is not designed for too high speeds, as it is used for comfortable walks with family or friends. You can often find walking bicycles with a low frame. for women. There are also models with speed switches, which allows you to set the desired gear on a certain section of the road. These bicycles do not weigh much. an average of about 14 kg. They can reach speeds of up to 23 km / h, and the average speed will remain within 12-17 km / h in the city and about 20 km / h on the highway.
The geometry of the road bike (road) is designed specifically for high-speed riding. The main design features are a very high frame parallel to the ground, narrow rims and tires, and a narrow handlebar with special handles. You should ride a highway with your chest pressed against the steering wheel as much as possible. Such a bike is more aerodynamic, so it is easier to develop and maintain an average speed of 28-33 km / h on it.
MTB bicycles (mountain). There are many types of mountain bikes with different characteristics, weights and geometries. The main purpose of MTB is cross-country riding. Most mountain bikes use a front shock absorber in the form of a soft fork. Less common are the so-called double-suspension. bicycles with front and rear shock absorbers. There are transmissions. These bicycles weigh from 13 to 27 kg, depending on the configuration and profile purpose. The steering wheel of the MTV is wide, the wheels are large with wide tires. Since the tread on these bikes is aggressive, the average highway speed is around 25 km / h. If you change tires for slicks, the speed increases by 3-4 km / h. In rough terrain, the speed is usually between 10 and 15 km / h.
What is bike roll and what does it depend on?
Tires and type of tread. For riding on a hard surface (asphalt, concrete, slabs), narrow slicks (bald rubber without a pattern) are best suited. But aggressive rubber with spikes and a pattern should be left for sand and soft soil.
Wheel size. As with cars, wheel size matters a lot in bicycles. The larger the wheels, the better they roll. In addition, such wheels can more easily overcome small irregularities and pits.
Wheel mass. The wheel consists of several parts: hub, spokes, rim, tube and tire. And every element plays a role. The lighter the wheel, the less load you put into pushing the bike.
Sleeve quality. With the same wheel weights, different hubs can roll differently. It is very easy to check this. One has only to turn the bike over and turn the wheel by hand. The longer the wheel spins, the better the hub works. Best used with industrial bearing bushings.
Chamber pressure. The harder the wheel, the easier it is to ride on smooth surfaces.
Weight of the bike. The greater the weight of the bike, as well as the weight of the wheels, requires more strength to ride. That’s why professional sports models are made from lightweight yet durable carbon.
Frame material. The stiffer the frame, the better the roll. Most often, bicycles are made of aluminum. This is the most durable material. Many manufacturers also artificially reduce the weight of the aluminum frame by creating light models.
Bicycle depreciation. often than not, shock absorbers only get in the way when driving on smooth roads. However, on rough terrain, they will be a good helper.
Cycling is one of the most popular sports of this century. Rooted in the distant 19th century, it does not lose its popularity among amateurs to this day. This is facilitated not only by the desire to be healthy and strong, but also by the variety of types and directions of riding, from walking bicycles to stunt disciplines BMX and MTB. Road and city bikes are in great demand among fans, which are versatile in use and are able to reach maximum speeds.
Olympic speed records
Of course, the fitness of professionals is very different from that of amateurs. However, there are people who have distinguished themselves among athletes. The absolute speed record on a bicycle is 268 km / h, but under certain conditions. Record holder Fred Rompelberg drove across the salt plain behind a car with a fairing that not only eliminated air resistance, but also created a vortex that pulled Fred with him. The record for the maximum speed when descending from a mountain on an MTB bike is 210 km / h. In 1984, a record was set for driving in a straight line with an average speed of more than 50 km / h and this figure has not yet been broken.