7 Speed Bike Speed Control

Shimano Mountain Bike Rear Derailleur Adjustment Screws: Technical Minimum

Despite the abundance of parallelogram-type spreaders from a Japanese manufacturer, their design and principle of operation are similar. In the process of adjusting the device, five elements are involved:

  • 1. fastening the cable in the form of an embedded bolt with a nut.
  • 2. screw for tensioning the cable with a drum.
  • 3. screw for adjusting the chain tension.
  • L. limit screw for adjusting low gears.
  • H. limit screw for high gear adjustments.

7 Speed Bike Speed Control

Special screws L and H, which are used to adjust the rear derailleur of a bike with Shimano Alivio, physically restrict the movement of the mechanism, which prevents the chain from jumping off. In practice, they are used mainly only when debugging a new transfer device, Subsequently, the procedure is not needed.

In the event that the cock or the mechanism itself is bent, adjusting the limit screws can solve the problem for a short time. Their sensitivity is not very high, so 1-2 turns at a time are quite justified.

Conveyor device and reasons for its functional failures

Before adjusting the rear derailleur on a bicycle, it is useful to find out the reasons for the malfunctioning of the mechanism. The essence of the problem lies in the following points:

  • Cable damage or lack of lubricant.
  • Violation of the integrity of the cable jacket.
  • Curved cock. fastening the mechanism to the frame of the bike.
  • Chain or cassette wear from sprocket.
  • Jammed chain tensioner rollers.
  • Steering wheel shift shifter problems.

How to adjust the low gear limiter?

The function of the L limit screw is to prevent the chain from overshooting the large sprocket. Improper alignment can lead to chain seizure between the sprocket and spokes or the inability to engage low gear.

Before the adjustment procedure, you need to install the chain so that it is on the back on the large sprocket, and in the front on the small one. Screw L is unscrewed as much as possible so that the switch moves without restrictions. The purpose of the set-up is to align the tensioner rollers and large chainring in the same plane. The task is performed by rotating the screw L:

  • Clockwise. the spreader assembly shifts towards the small sprocket;
  • Counterclockwise. the node moves towards the wheel.

Technique: how to properly adjust the rear derailleur on a bicycle Shimano?

The procedure for repairing and debugging the chain drive units must be carried out on a clean bicycle. Be sure to raise the rear wheel, for which they hang the frame on a hook or prepare a special stand.

How to adjust the high gear limiter?

For alignment, the chain is set to high gear with the smallest sprocket at the back and the largest sprocket at the front. For those who are interested in how to adjust the rear derailleur on a mountain bike, it is important to remember that the essence of the adjustment is to align the rear small chainring with the tensioner rollers. This task is accomplished by rotating the adjusting screw H:

  • Clockwise. the frame is deflected towards the large asterisk;
  • Counterclockwise. the frame moves to the outside.

Preparatory process

As mentioned above, a thorough cleaning precedes a competent setting. Sometimes even such a procedure can have a beneficial effect on the performance of devices. Technological aspects of the preparatory work are as follows:

  • Clean derailleur and sprocket cassette.
  • Clean old grease from tensioner rollers.
  • Wash and lubricate the chain.

Next, you need to free the hummock, for which the tension screws in the shifters and on the rear spreader are screwed in until they stop. The cable should be pulled out of the clamping screw, but it is not necessary to remove it. DO NOT interfere with inspecting it for damage and lubricating it if necessary.

How to adjust the cable tension?

The technological process is simple. it is enough to debug the transition between two neighboring stars, the index gear change system is designed so that the shift will be adjusted on all the stars of the cassette:

  • Pull the cable by hand and fix it with the fastening bolt;
  • The final adjustment is carried out by rotating the hollow screw with a drum (position 2 in the figure), the chain should easily move from one sprocket to another and back again with one press of the shifter.

Once you have finished adjusting your Shimano rear derailleur on a mountain bike, tighten and secure the cable securely. It is important that it rests in the guide groove. If the work is done correctly, then when the pedals are rotated, the chain runs silently and does NOT jump to the side.

Adjusting the chain tensioner

The tensioner is a spreader assembly that provides optimum chain drive rigidity. Excessive tension Not only makes the chain difficult to move, but also wears out the gearshift system. The weakened state prevents a clear transition.

The tensioner assembly is debugged as follows:

  • Place the chain at the rear on the largest sprocket and at the front on the smallest sprocket.
  • If, when the chain is moving, the tensioner roller touches the cassette, then you need to tighten the tension screw (position 3 in the figure) so that the gap between them is about 5 mm.
  • Install the chain at the back on the smallest sprocket, and at the front on the largest sprocket, and repeat the operation described in point 2.

How to adjust the rear derailleur on a bike with Shimano Alivio?

The gear selector mechanism of a mountain bike seems complicated only at first glance, in fact, its adjustment is feasible even without the help of a specialist. Alivio mid-range equipment has an optimal ratio of quality and price, so it is less prone to wear, which makes it easier to align its components. You are unlikely to succeed in breaking the switching unit during operation. the design of the system is simple and reliable, but moral pleasure from an independently performed operation is guaranteed.

How to set up and adjust the bike’s front derailleur

Sooner or later, every cyclist has to adjust and adjust the bike’s front derailleur. And the cheaper the transfer, the more often. This happens for many reasons. For example, the cable is stretching, or you decide to adjust after replacing the derailleur. It does NOT change the essence. This operation requires performing approximately the same steps. Therefore, we decided to talk in detail about how to set up and adjust the front derailleur of a bicycle using the example of pictures and. And what needs to be done before performing this procedure.

Correct installation of the front derailleur

The correct position of the front derailleur is considered such that its longitudinal guide frame is parallel to the chainrings, and the distance from the bottom of its outer part to the largest chainring is no more than 2 mm. To make it easier to set the correct transfer position, it is advisable to remove the chain.

We set the distance from the bottom of the outer frame to the largest star by moving the transfer along the vertical tube of the bicycle frame. We bend the switch parallelogram from the frame towards the largest sprocket, and aligning the frame and the large sprocket with each other, we try to achieve a minimum distance (no more than 2 mm) at which its outer part of the day does not touch the teeth. To simplify this procedure, you can insert some object between the frame and the parallelogram.

If you bought a new derailleur from Shimano, this procedure is simplified by the fact that there is a plastic sticker on the transfer frame with marks that indicates at what level it should be installed before the large star of the system.

After we have determined the height at which the switch clamp will be fixed, we make notes with a marker and slightly tighten the clamp fixing bolt.

To adjust the position of the axis of the star system, loosen the clamp bolt (while the cable should be folded back) and, by rotating the switch, adjust it so that the frame is parallel to the front sprocket. Due to the complex geometry of the latter, it is quite difficult to determine by eye. You can navigate by the parallelogram (if the design allows it). To simplify this operation, you can stick a ruler (on double-sided tape) or other object on the switch frame, which will simplify the positioning of the transfer.

After that, slightly tighten the clamp bolt and re-check the distance from the lower edge of the frame to the largest sprocket in the system, and the parallelism of the longitudinal axis of the chainring.

If everything is fine, then completely tighten the clamp bolt.

This completes the adjustment of the position of the front derailleur. Now you can put on the chain and start tuning.

Design and principle of operation of the front crossover

The design of the front derailleur is very simple. We will consider all its components, as well as their purpose below.

  • Clamp. This part attaches the front derailleur to the bike frame.
  • Parallelogram. Parallelogram-shaped hinged spring-loaded part. It is the main moving part of the front bulkhead, to which the frame is attached.
  • A guide frame that has an outer and an inner part. A chain runs inside her.
  • Adjusting bolts L and H (stops). There are two of them. They restrict the movement of the guide frame towards the frame (L) and away from it (H).
  • Cable bolt. Locks the gear shift cable.

Operating principle It is based on simply pushing the chain onto the desired star. When the gear is shifted from a larger (in diameter) star to a smaller one, the cable tension is weakened, and the switch spring pulls the parallelogram with the guide frame a certain distance towards the frame. The outside of the frame pushes against the chain, causing it to bounce onto the smaller sprocket. When switching from a smaller star to a larger one, the opposite process occurs. The derailleur cable tightens and moves the parallelogram and guide frame away from the frame. The inner part of the frame presses on the chain, and thanks to the special shape of the frame itself, as well as special hooks on the sprocket of the front system, the chain engages and throws it onto a large star.

This design provides limit bolts (L and H), which the parallelogram rests against when reaching the end positions. If the adjustment of the front derailleur stops is done by the word of business, the chain will jump off the bottom bracket or crank arm.

Adjusting and adjusting the front derailleur of the bicycle

After you have made all the preparatory measures, you can proceed to the adjustment and tuning. If you are installing a new switch or removed it during cleaning, then before adjusting it should be positioned to the chainring, and then proceed to adjust.

READ  DIY Bike Chain Key

Things to do before adjusting the front derailleur

  • Check if the transfer is suitable for the front sprocket system. If you cannot make the adjustment for a long time or install a new front derailleur, then it is worth checking this item. There are three main parameters (apart from the direction of the cable feed, etc.), which may NOT be adequate for normal operation of the switch. This is the maximum number of teeth of the largest sprocket, the maximum difference between the teeth of the smallest and largest sprockets, and the minimum difference between the teeth of the middle and largest sprockets. These parameters can be found in the instructions for the speed switch. There are also derailleurs for three front stars and for two, plus the system may NOT correspond to everything. We will cover the topic of how to choose a front derailleur in more detail in another article. Below we give a picture with the transfer parameters of Shimano Alivio FD. M 430/431 for example.
  • Check for play and visually inspect for damage. It happens that during a fall, as well as with prolonged use, backlash of the frame, parallelogram and other parts of the switch is formed. Plus, the frame itself may bend. This leads to unclear gear changes and causes tuning problems. Fine tuning is impossible without the elimination of backlash. The best option would be to buy a new switch.
  • Clean any dirt from the switch and lubricate it again. Before you start adjusting and adjusting the front overhaul, you should thoroughly clean all its parts from dirt and re-lubricate. These are primarily springs, as well as movable parallelogram joints. To do this, you can remove it from the bike frame. It should be noted that in this case it will be necessary to re-adjust the correct position of the star switch of the system.
  • Clean and lubricate the front derailleur cables and check their integrity. Disconnecting the cable from the fixing bolt on the switch and We take it out of the lever on the steering wheel (this is not necessary, you can clean and lubricate the cable without removing it). We examine for a break in the veins. If everything is normal, then clean the cable from dirt and lubricate it (if damage is observed, then the cable should be replaced with a new one). Then we insert it into the shifter and thread it into the shirts. Back to the switches Do not fasten the ego, this will be done during the transfer setup. If, when biting off the ends, for example, pliers, the end of the cable is fluffed, then inserting it back into the shifter is unlikely to work. In order to do this, the end of the cable should be soldered with tin. To simplify this procedure, Macau put it in soldering acid and solder it. Do not solder too much tin, as This will prevent the cable from being threaded through the hole on the shifter, just cover it with a thin layer.

Why can’t I adjust the front derailleur

If you have not been able to clearly adjust the front derailleur of your bike several times, then most likely you have one of the following problems.

  • Wrong switch or star system.
  • The switch is deformed or out of order.
  • Tight running of the cable in the shirt.
  • The shifter is out of order.
  • Chain too stretched.
  • Derailleur, cable and chain have significant contamination.

Speed ​​selector setting

In order not to keep the bike suspended while tuning, try hanging it from the saddle, thereby lifting the rear wheel. You can also use an ironing board for this. We lay the bike with the upper tube of the frame on the ironing board, threading it into a triangle.

Setting up the front derailleur is straightforward. We will write it down point by point for greater clarity.

  • We set the lowest speed using the switch on the steering wheel (remember that at this stage the cable should not be fixed for transfer). We twist the adjustment of the gear shift cable tension on the shifter until it stops clockwise (when looking at the entrance of the shirt into the shifter) and return it back by 1-2 turns. Many recommend tightening completely, but as practice shows, for further fine tuning it is better to leave a margin of tension / loosening of the cable in both directions.
  • Set the lowest speed on the rear derailleur (largest sprocket). In total, you will get the first speed in front and behind (the chain should be on THESE stars).
  • Adjust the “L” switch limiter so that the inside of the frame is as close to the chain as possible, but does not touch it when pedaling. To do this, if you need to move the frame towards the bike frame, turn the bolt L counterclockwise, from the frame. clockwise.
  • We insert the cable into the place of fixation on the gear selector and, pulling it (with your hands, do not use pliers), tighten the cable bolt.
  • Shifting gears from the front to the largest sprocket, from the rear to the smallest (the chain must be on THESE sprockets).
  • We adjust the limiter “H”. The position of the guide frame should be achieved so that its outer part is as close to the chain as possible, but does not rub against it when pedaling. To move the frame towards the frame, turn the screw clockwise, in the opposite direction. against.
  • We set the 5th speed on the back transfer. After that, rotating the pedals, we change the speeds in front of it with the switch over the entire range (3. 2. 1. 2. 3) several times. Then set speed 2 to the front and, change reverse gears, check the absence of chain friction in the frame in positions 2. 2 and 2. 7 (example for 24 speed bicycles). On the more expensive front derailleurs you can achieve frictionlessness even at 2-1 and 2-8 (although you must understand that these are NOT normal modes and should not be used when driving). If there is chain friction in the frame in these positions or indistinct gear shifting, then the cable tension should be adjusted by rotating the adjustment on the front shifter lever. In case of problems when switching from a smaller chainring to a larger one, tighten the cable (turns the adjustment counterclockwise), and when it fails to switch from a larger to a smaller one, loosen it (steep clockwise adjustment). If there are comments on the work, then the following test must be performed under load when driving on roads.
  • We find a flat section of the road (without bumps and slopes) and check the operation of the front cross-over when driving. In case of any problems when switching, right on the go, we rotate the adjustment on the shifter in the direction we need.

If you do not understand something on the question of how to adjust the front derailleur, then we advise you to look at this topic.

Conclusion

As you may have noticed, setting up and adjusting the front derailleur on a sports bike at home is not a big deal. It is enough to do everything methodically and do not rush. Failed to set up the first time, please try again. The hardest part of this procedure is getting the front derailleur in place correctly on the bike frame, which takes a little bit of skill. And so, it doesn’t matter what kind of throw you have for Shimano or SRAM. Follow the instructions and you will succeed.

Rear derailleur

The gear shifter is an important part of a multi-speed bike. Thanks to this component, it becomes possible to move in extreme conditions, which include movement against the wind, ascents, poor road quality. The transmission unit must deal with all these problems. Ride quality and cyclist safety depend on the smooth operation of the speed switch. This skill is very useful, and every VELOBIKE owner should learn how to independently adjust the gear shifter. Every cyclist can make adjustments to bicycle shifters. You need to study the theory in detail, read the instructions, or using the advice of experienced bike owners.

Before setting the derailleur, the rear derailleur must be adjusted. It will greatly facilitate the whole process of adjusting the alignment of the bike in the correct position (wheels up). So, all the necessary details will be in sight, and it will be much easier to get to them.

Reasons for poor gear shifting:

  • Physical defects of the switch parts;
  • Contamination of parts. To prevent this from happening, the components of the transmission unit must be periodically cleaned of dirt, dust and old grease;
  • Worn rope with elements of damage. Such a part requires replacement;
  • Rooster damage.

If you observe damage, deformation and wear of the constituent parts, they must be replaced as they are practically irreparable.

If all parts are in good working order, adjust the switch. What is the speed selector made of? The components of the speed switch are as follows:

  • Handle for gear shifting, located on the steering wheel;
  • A shifter that attaches to the handlebars near the handles. Handles and a cable are attached to the shifter. It is with the participation of the cable that the impulse is transmitted from the shifter to the stars;
  • Cassette, which includes different-sized stars;
  • Front fixing mount;
  • Rear derailleur, whose main function is to transfer the chain to the desired sprockets.

Bicycle front derailleur

The transition to the setting of this mechanism is possible only when the rear derailleur is set. This feature is important to take into account before starting work. Figure 2 shows the switch (round, black).

Leave the chain on the middle sprocket of the front block and place it on the large sprocket in the rear block. If chain friction is observed, reactivate adjuster L. To adjust stop H, the chain moves to the largest sprocket at the front and smallest at the rear. The adjuster will help to position the chain in the optimal position without friction and excessive chain tension. At the end of the work, be sure to check the quality of its implementation.

Correct installation of the front derailleur

You can start the front derailleur setting only after adjusting the rear derailleur. Installation is the initial step in speed selector adjustment. It’s very important to do it right.

  • Before installing the switch, it is necessary to inspect the condition of the constituent parts and, if necessary, clean them of contamination and lubricate.
  • Next, adjust the location of the front derailleur. On the frame, it should be located along the pipe under the saddle.
  • Set the steering angle parallel to the drive sprocket on the front cassette of the transmission unit.
  • Next, you need to adjust the gap between the underside of the derailleur frame and the top line of the teeth of the large gear. The gap should be minimal.
  • Adjust the degree of cable tension.
  • Place the chain close to the inside of the frame.

It is also worth paying attention to the chain setup. The bicycle chain is a very important element, with the help of which the impulse is transmitted from one chain to another and the adjustment process takes place. The technical condition of the circuit is of great importance for the operation of the entire system. If, for some reason, the bicycle chain is stretched or deformed, this cannot but adversely affect the operation of the entire transmission unit. To prevent this from happening, the chain must be periodically removed and cleaned, and then set the correct position. There are lock and lockless models of bicycle chains. They differ in the way they are connected. To remove the locking chain, it is enough to find the link with the lock and disconnect it with a screwdriver. The lockless bicycle chain is disconnected using a squeeze. This tool helps to push out the link and make the connector. If it skews for some reason, this can adversely affect the gearshift process.

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One of the best manufacturers of bicycle parts, including derailleurs, is the Japanese company Shimano, which has a proven track record of producing products in which Japanese quality is combined with budget and price. Shimano derailleurs (fig. 3) are suitable for all types of bicycles. Shimano derailleurs are installed on both regular touring bicycles and mountain and track bikes with gearboxes up to 33 speeds.

Another recognized market leader is Sram. The products of this company are used on bicycles of the city bike category, as well as on sports bicycles. Sram products are of good quality and affordable price for cycling enthusiasts.

Every bicycle owner who prefers this type of transport to others is obliged to understand how to switch its speeds. It is believed that the more speeds a bike has, the better it is. But in fact, speed only allows you to improve the quality of maneuvering and squeeze the maximum out of the bike’s capabilities, so then everything depends on the dynamic efforts of the person riding the bike. Conventional bicycles have a simpler design compared to high-speed ones. There is less hassle with such a bike, but it also has fewer possibilities. In the transmission unit of such bicycles there are only two stars: one large and one small. The multi-speed bikes that have gained popularity in recent years have two sets of views in their transmission units: front and rear. Each cassette contains stars of different sizes. To switch gears correctly, you need to remember a few basic rules:

  • If your bike is not equipped with a planetary hub, you only need to switch speeds on it while driving, otherwise there is a danger of damaging the bike.
  • During gear shifting, you should not apply significant dynamic efforts, in order to eliminate the danger of a burst of flowers, it is advisable to change gears consistently, and not making sharp jerks.

Parallelogram Spring Problems

For better performance, the return spring needs to be washed. Then lubricate, after cleaning.

Gear shift types

Before making adjustments, determine what kind of gear shifting your bike is in. There are 3 main types of switches.

  • External switching mechanism.
  • Internal switching mechanism.
  • Combined type.

The internal gearshift mechanism appeared earlier than the external one. The progenitor of multi-speed bushings is the English company Sturmey-Archer. It was they who created the first two and three speed hubs, which were released in 1902.

What parts help to adjust the speed switches

The multi-speed mountain bike or city bike is equipped with Multiple gears and offers new possibilities. It is much easier to conquer peaks, ride on bumps, even perform various tricks on it. To enjoy cycling, you need to set the speed switch correctly.

Those who first decided to independently figure out the switch mechanism should first familiarize themselves with the transmission parts and their functions.

A drivetrain is a collection of bicycle parts that can take on some of the cyclist’s load. It also helps you ride on difficult terrain, such as mountains.

Knowledge of the structure of modern bicycles helps to properly set up gear shifting

We will NOT dwell on each part of the bike in detail. Let’s consider just some of the elements that are part of the transmission.

  • The front derailleur assists the chain in guiding the chainring. Attaches to the frame near the pedals;
  • The system is part of the front derailleur. Consists of views, different in diameter and number of teeth, which are attached to the connecting rods with special bolts;

The front derailleur is in the pedal area

Rear derailleur located on the rear wheel

The most reliable chains are matte gray. If the chain has a yellowish tint, this indicates its low quality. Nickel plated chains are considered to be of average quality.

The bike chain is an important part of the drivetrain

Shifters are mounted on the handlebars and are responsible for gear shifting

The transmission cable connects the shifter to the derailleur

How to fine-tune the rear derailleur

The most important factor when adjusting a switch is accuracy. You can fine-tune it as described at the beginning of the article, but during implementation you need to pay special attention Not only to the adjusting screw, but to the entire mechanism as a whole.

How to adjust speeds on a stealth bike. How to properly adjust the rear and front derailleurs on a bicycle photo and description of the process

Despite the fact that the bicycle was invented a long time ago and, it would seem, should have been out of date for a long time, but this two-wheeled vehicle is gaining more and more popularity every year. Cycling enthusiasts prefer this type of transport due to its convenience, ease of operation, environmental safety and practicality. Not only ordinary bicycles are very popular, but also mountain, track VELOBIKE, in which modern innovative technologies are involved. In order for the owners to enjoy cycling, they need to be looked after and the condition of all parts and assemblies should be monitored. If in the process of cycling, you hear extraneous sounds, creaking, knocking and twitching during gear shifting, it’s time to pay attention to such a detail as the gear selector.

What to do if you can’t adjust the bike‘s rear derailleur

There are several ways to address this issue. But if the standard tuning instruction did not work, to tune the rear derailleur you need to:

  • Dismantle the chain, remove the cable;
  • Move the switch to the chain position for the smallest sprocket;
  • Use adjusting bolts (this way you can tighten the cable)
  • Set the adjusting bolt H to the extreme position;
  • Move the part called the parallelogram to the big star and adjust the position of the bolt L.

The regulator is fixed with screws. It must be set to the extreme position. After that, the chain must be displaced in this order: the front cassette is the largest star in diameter, the rear, on the contrary, is the smallest.

Bicycle front derailleur

The transition to the setting of this mechanism is possible only when the rear derailleur is set. This feature is important to take into account before starting work. Figure 2 shows the switch (round, black).

Leave the chain on the middle sprocket of the front block and place it on the large sprocket in the rear block. If chain friction is observed, reactivate adjuster L. To adjust stop H, the chain moves to the largest sprocket at the front and smallest at the rear. The adjuster will help to position the chain in the optimal position without friction and excessive chain tension. At the end of the work, be sure to check the quality of its implementation.

How the switches work

Using the handle and shifter, the cyclist activates the required speed. In a certain position of the handle, the cable is pulled. As a result of this tension, the frame is thrown onto larger sprockets; when loosening, the cable is not thrown onto small sprockets. As mentioned above, bike setup can be started from the rear derailleur. Procedure for adjusting the rear derailleur:

  • We select the second star in the front block, and the smallest in the rear one and set the switch chain on them;
  • The bike’s rear derailleur system has two bolts that act as stops. One stands for H and the other stands for L. THESE two bolts control the high and low gears on the sprockets. If any extraneous sounds occur during the adjustment process, you can get rid of them using the latch;
  • Check the tension of the cable and if the tension is NOT required, use the adjuster located on the shifter;
  • Test the switching quality. If the switching occurs smoothly, no extraneous sounds are heard, then you did everything right.

Rear derailleur

The gear shifter is an important part of a multi-speed bike. Thanks to this component, it becomes possible to move in extreme conditions, which include movement against the wind, ascents, poor road quality. The transmission unit must deal with all these problems. Ride quality and cyclist safety depend on the smooth operation of the speed switch. This skill is very useful, and every VELOBIKE owner should learn how to independently adjust the gear shifter. Every cyclist can make adjustments to bicycle shifters. You need to study the theory in detail, read the instructions, or using the advice of experienced bike owners.

Before setting the derailleur, the rear derailleur must be adjusted. It will greatly facilitate the whole process of adjusting the alignment of the bike in the correct position (wheels up). So, all the necessary details will be in sight, and it will be much easier to get to them.

Reasons for poor gear shifting:

  • Physical defects of the switch parts;
  • Contamination of parts. To prevent this from happening, the components of the transmission unit must be periodically cleaned of dirt, dust and old grease;
  • Worn rope with elements of damage. Such a part requires replacement;
  • Rooster damage.

If you observe damage, deformation and wear of the constituent parts, they must be replaced as they are practically irreparable.

If all parts are in good working order, adjust the switch. What is the speed selector made of? The components of the speed switch are as follows:

  • Handle for gear shifting, located on the steering wheel;
  • A shifter that attaches to the handlebars near the handles. Handles and a cable are attached to the shifter. It is with the participation of the cable that the impulse is transmitted from the shifter to the stars;
  • Cassette, which includes different-sized stars;
  • Front fixing mount;
  • Rear derailleur, whose main function is to transfer the chain to the desired sprockets.

How to properly adjust the rear and front derailleurs on a bicycle photo and description of the process

Despite the fact that the bicycle was invented a long time ago and, it would seem, should have been out of date for a long time, but this two-wheeled vehicle is gaining more and more popularity every year. Cycling enthusiasts prefer this type of transport due to its convenience, ease of operation, environmental safety and practicality. Not only ordinary bicycles are very popular, but also mountain, track VELOBIKE, in which modern innovative technologies are involved. In order for the owners to enjoy cycling, they need to be looked after and the condition of all parts and assemblies should be monitored. If in the process of cycling, you hear extraneous sounds, creaking, knocking and twitching during gear shifting, it’s time to pay attention to such a detail as the gear selector.

Correct installation of the front derailleur

You can start the front derailleur setting only after adjusting the rear derailleur. Installation is the initial step in speed selector adjustment. It’s very important to do it right.

  • Before installing the switch, it is necessary to inspect the condition of the constituent parts and, if necessary, clean them of contamination and lubricate.
  • Next, adjust the location of the front derailleur. On the frame, it should be located along the pipe under the saddle.
  • Set the steering angle parallel to the drive sprocket on the front cassette of the transmission unit.
  • Next, you need to adjust the gap between the underside of the derailleur frame and the top line of the teeth of the large gear. The gap should be minimal.
  • Adjust the degree of cable tension.
  • Place the chain close to the inside of the frame.
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It is also worth paying attention to the chain setup. The bicycle chain is a very important element, with the help of which the impulse is transmitted from one chain to another and the adjustment process takes place. The technical condition of the circuit is of great importance for the operation of the entire system. If, for some reason, the bicycle chain is stretched or deformed, this cannot but adversely affect the operation of the entire transmission unit. To prevent this from happening, the chain must be periodically removed and cleaned, and then set the correct position. There are lock and lockless models of bicycle chains. They differ in the way they are connected. To remove the locking chain, it is enough to find the link with the lock and disconnect it with a screwdriver. The lockless bicycle chain is disconnected using a squeeze. This tool helps to push out the link and make the connector. If it skews for some reason, this can adversely affect the gearshift process.

One of the best manufacturers of bicycle parts, including derailleurs, is the Japanese company Shimano, which has a proven track record of producing products in which Japanese quality is combined with budget and price. Shimano derailleurs (fig. 3) are suitable for all types of bicycles. Shimano derailleurs are installed on both regular touring bicycles and mountain and track bikes with gearboxes up to 33 speeds.

Another recognized market leader is Sram. The products of this company are used on bicycles of the city bike category, as well as on sports bicycles. Sram products are of good quality and affordable price for cycling enthusiasts.

Every bicycle owner who prefers this type of transport to others is obliged to understand how to switch its speeds. It is believed that the more speeds a bike has, the better it is. But in fact, speed only allows you to improve the quality of maneuvering and squeeze the maximum out of the bike’s capabilities, so then everything depends on the dynamic efforts of the person riding the bike. Conventional bicycles have a simpler design compared to high-speed ones. There is less hassle with such a bike, but it also has fewer possibilities. In the transmission unit of such bicycles there are only two stars: one large and one small. The multi-speed bikes that have gained popularity in recent years have two sets of views in their transmission units: front and rear. Each cassette contains stars of different sizes. To switch gears correctly, you need to remember a few basic rules:

  • If your bike is not equipped with a planetary hub, you only need to switch speeds on it while driving, otherwise there is a danger of damaging the bike.
  • During gear shifting, you should not apply significant dynamic efforts, in order to eliminate the danger of a burst of flowers, it is advisable to change gears consistently, and not making sharp jerks.

Chains and sprockets

These two parts are the main parts of the bicycle, since they directly move with the help of them. Most often, the stars are a cassette. Which consists of 6-7 stars. It all depends on the number of speeds on the bike.

And the chains vary in pitch and length. The chain pitch is the size of one link on the sprocket or chain, and in accordance with the pitch on the sprocket, you need to select the chain with the desired pitch. The length is basically the same everywhere, but it can also be of an individual size. Then you will have to look for her for a very long time, or else the crypt yourself.

Adjusting screws on the switch

The adjusting screws are the same H and L screws that are used when adjusting the rear derailleur. Their action is based on the locking of the speed switch, which allows it NOT to dangle. Usually they are accessed only once, during the first setup, and they are no longer touched. But in the event of a cock or a switch breakdown, you simply cannot do without them. They are NOT superfluous sensitive, so they can be safely twisted and adjusted as needed.

Chain tensioner rollers

The tensioner rollers are included in the mechanism, which ensures high-quality chain tension during gear changes or while the bike itself is moving. Without it, the chain will not keep at the same level, which will NOT allow pedaling or shifting.

How to adjust the rear derailleur on a bike

Setting up the speed switch is NOT a tricky business, and anyone who knows at least a little about the mechanisms can do it.

To independently configure all the mechanisms and put them into action, you need to do the following:

  • You need to check if the switch itself is bent. This can be determined by looking at the tensioner. it should be parallel to the stars on the rear wheel. If it’s all about him, you need to try to straighten it with pliers or other tools.
  • If everything is fine with the switch, then most likely the cockerel is to blame (this is the mount on which the switch is placed). Most often, it also bends, and it has to be straightened periodically, so that at the first breakdown it needs to be replaced.

If all of the above is done or in order, then you can proceed directly to the switch setting itself.

This should be done as follows:

  • We put the switch on the highest speed (that is, on the smallest star)
  • We find two screws. H and L. Turning the screw H so that the roller on the switch moves one mark with a smaller star
  • We put on the lowest speed (large sprocket), and rotate the screw L to align the roller with the large sprocket
  • We put it on the highest speed again and pull the cable. In this case, you need to make sure that he got into the special premiere. Should be tightened tighter!
  • Check switching! If it switches very tightly, or does NOT switch at all, then you need to loosen the cable a little, or, on the contrary, pull it.
  • If everything works well, then we can assume that the job is done.

How to adjust the front derailleur on a bike

Adjusting the front derailleur is a little easier than the rear derailleur. An important factor here is its correct and reliable installation on the frame, and everything else is done within 15 minutes.

The correct front derailleur position is when the chain is on the largest sprocket and a distance of 1-3 mm is maintained from sprocket to frame. Then we can assume that the switch is installed correctly.

Steering wheel switches

The switches here are exactly the same as on the rear wheel. They are absolutely NOT different, and even located exactly the same.

Reasons for the malfunction of the rear spreader

The reasons can be varied. this is a bent cock or derailleur, poor cable tension, corrosion on parts, etc. Usually, such problems occur if the derailleur is incorrectly set or no one has used a bicycle for a long time, which caused corrosion on the parts of the diverter. And his movement is difficult.

Adjusting the bike speed switch

Tips for fine tuning

  • You need to set the minimum speed, that is, at the back, the chain stands on the largest star, and in front on the smallest.
  • Loosen the cable tension a little and turn screw L until there is no 1 mm gap between the chain and the frame
  • Firmly fixing the cable, before that, inserted it into a special groove.
  • We set the highest speed
  • Adjust the gap between the chain and the inner side of the frame with the screw H
  • We check the performance
  • If the switching is tight, then we adjust with screws to the desired state
  • After all the manipulations, the bike should be washed and all parts (chain, sprockets, etc.)

Adjusting bike speeds

Adjust the bike speeds. One of the most frequent queries about bicycles on the Russian Internet. For whom this task seems trifling, to someone, even after lengthy explanations, it turns out “too tough”.
Of course, the easiest way is to give the bike to the workshop, where it can be done in a matter of minutes. But the most interesting! Moreover, these skills will be needed in case of long trips, where, except for the tool and your hands, no one else will help.

So, the cycling season is on the nose, we take out your pets from the frozen balconies and closets and begin “to play magic”.

Actually. It’s not all that difficult, you need a rear wheel stand (for easy gear adjustment) and a tool. Standard set of 2-3 socket (letter “L”) hexagons, adjustable wrench, better set of wrenches for different nuts flat and Phillips screwdriver for adjusting screws.

We put the chain, front and rear, on the smallest sprockets. We clean the bike from dirt and impurities, we wipe all surfaces from dust, remove a clot of old grease, all rotating elements Must be clean.

Working with adjusting screws.
If the bike went to winter storage in good condition, do not touch the adjusting screws yet. The mechanics of all the famous bicycle manufacturers in the world recommend changing all the cables once a season. In our case, we will change the cables and shift shirts. To do this, unscrew the nut securing the shifter drive cable and remove the protective cap from the cable.

If there is an adjustment nut on the shifter and on the switch of the cable tensioner, screw it back in so that it can be used to tighten the cable. Remove the shirts from the cable, but do not throw them away. They are useful for cutting new ones. We take out the cable from the shirt and, wiping it from dirt, take it out of the shifter and replace it with a new one. Next, we put in place new shirts (they must be with longitudinal weaving) with new tips. If the old shirts did not fit well in length, lengthen or shorten them. Next, threading and pulling the cable of the front and rear derailleur.
Trying to switch the chain to a large sprocket. Then we drop the chain back. If everything works out, then after checking the shifting of all rear gears, we can assume that the rear derailleur is set, and if not, we adjust the shift by pulling or releasing the shifter cable with the adjustment nuts. You need to turn them very smoothly, literally a quarter of a turn. We look from behind at the position of the switch on the smallest and largest stars. You can ensure the correct position of the switch wheels: 1. Adjust the position of the rear derailleur with a screw marked “Lo” or “-” so that the position of the largest gear corresponds to the same plane as the switch rollers. just twist or unscrew it, but very gradually and ” from above “I control the position. Pry adjusting the position with the second screw labeled “Hi” or “”. the task is the same. Ensure that two stars are in the same plane (the smallest and the gearshift wheels in the switch).
Do the same with the front derailleur. We start setting it up by checking the switch operation after replacing the cable and shirts with new ones. Tighten the cable when the derailleur is on the smallest chainring. Next, try switching to 2 and 3. The position of the switch is adjusted the tension of the cable with the adjustment nut located on the shifter. Sometimes you have to release and re-tighten the cable that fixes the nut on the switch.