How to Install a Speed ​​Switch on a Bicycle

How to put a rear derailleur on a bike. How to put a rear derailleur on a bike

Having traveled many roads on a bike, you are convinced that buying stylish grips and choosing the right tires is not enough for a comfortable ride, it is much more important to have a branded rear derailleur, which will be correctly installed and configured.

Something about a switch.

The gearshift mechanism was invented by Tullio Campagnolo in 1950. This discovery made a splash among bike manufacturers, who from that moment on, polls began to equip new models with this device.

The main purpose of the mechanism is to increase or decrease speeds by throwing the chain over the stars in the cassette. In addition, the rear derailleur on the bike prevents the chain from sagging by keeping it taut. than half a century has passed since the invention of the device, during which time many of its varieties have been created.

The number of gears that you can choose depends on the length of the frame: the longer it is, the more speeds are provided by the design of the bike. However, it is impossible to say unequivocally that a long frame is better, someone likes a short frame that is not afraid of stones. And here everyone is right in their own way!

What is the rear derailleur made of?

The material of manufacture can be different: from stainless steel to titanium. On budget bicycles, as a rule, steel and plastic derailleurs are installed. such products are short-lived, work poorly. Models of the middle price segment are equipped with an aluminum movement, and the most expensive ones are composed of composite, carbon and titanium.

Installing the rear derailleur on a bicycle

Owners of an old bike, equipped with a switch of an unknown brand, always reach out to “bring it to mind.” Often, with a device assembled independently from spare parts of various brands, many problems arise: from the constant throwing of the chain over the star to the complete “sabotage” of the movement. Therefore, it is easier and cheaper to “get hold of” a new one, rather than trying to adjust and repair the rear derailleur on a bicycle, which is already hopelessly damaged.

For a bike that is used periodically and only on flat roads, it is impractical to install an expensive derailleur of famous brands (Shimano, Sram, etc.). However, if you plan on rolling hills and slides, pay attention to mechanisms with a large range of speeds.

Replacing the derailleur on a bicycle: a sequence of actions

  • The replacement process begins with removing the old mechanism from the frame. To do this, open the chain link, unscrew and remove the old switch.
  • Next, to the “cock”, which is a protruding triangle with a hole, we fix a new mechanism. It should be screwed on well, but not too tight.
  • Then we install the chain on the smallest star so that the roller and the star are visually located on the same line.
  • Carefully slide the derailleur back to the largest sprocket without holding onto the roller, which is easy to bend. Thus, you will be insured against the risk of the chain hitting the spokes.
  • Using the adjusting screw, we fix the position of the switch so that it still remains opposite the large star. If the mechanism hits the star, then you can lose the spokes, too much clamping is fraught with failure of the lower gear.
  • Moving on to the cable. normally it should move freely in the shirt. It is necessary to check the absence of creases and the course itself. To do this, we install the chain on a small star, pull the cable and fix it in a taut position.
  • We check the operation of the mechanism. First of all, turn the pedals. there should be no clicks in the process, and the very switching of speeds up and down should be smooth, without jumping over the stars and without delays. At first, it is better to take a screwdriver on a bike ride. under load, the mechanism may need to be adjusted.

Regardless of the mechanism of which company you choose, sooner or later you will have to face preventive maintenance. After all, the rollers are consumables and wear out as the bike is used, so from time to time it is necessary to carry out their preventive replacement.

Many people think the rear derailleur is much easier to set up than the front derailleur. In both cases, you will have to make some effort, but this work will pay off more than comfortably while riding. If you don’t want to waste time installing the derailleur. contact us for a bike repair service.

How to install a rear derailleur on a bike?

Having clocked many kilometers on a bicycle, I was convinced that a branded derailleur is much more important for a comfortable ride than stylish grips or leather Brooks. But it’s not enough just to buy Shimano or Sram, the quality of installation and setup is important.

A bit of boring theory

The rear derailleur mechanism throws the chain over the cassette stars, allowing you to lower or increase gears (for reference, it was invented by the Italian Tullio Campagnolo back in 1950). This device also keeps the chain taut. There have been many varieties since the invention. A little about the main, most characteristic features.

  • Manufacturing material. From steel to carbon. The entry-level models are equipped with steel, and not always of good quality, and plastic. In the right hands, these switches even work sometimes. Models of the middle category are in most cases made using aluminum. The most expensive models can boast not only precision in work, but also titanium, carbon or composite.
  • Frame size. In theory, everything is simple. the longer the frame, the more gears you can select. However, one cannot say so categorically, since someone will prefer a short frame that is not afraid of stones, while others are interested in greater comfort in switching. And everyone is right in their own way.

You can still describe in detail the action of the spring or the options for the location of the cable for a long time. However, many good articles have been written on this topic. I will only note that there is not much difference from which side the cable enters the switch. So, now about the interesting.

Installation and adjustment

Reference: The Shimano Tourney TX is the entry-level model, although the exterior design suggests a higher class.

And putting something more serious on an inexpensive bike used only for riding exclusively on asphalt is pointless. Switching range was important, however, as the city is teeming with hills, hills and mountains.

So, replacing the rear derailleur starts with removing the old noname from the frame. it’s time for Shimano. The chain link is revealed. If this is not the case, then you need to use squeeze.

The old switch is unscrewed and removed, and a new one is hung in its place and screwed to the “cock”. a protruding triangle with a hole in the frame. It is worth tightening well, but without undue enthusiasm.

We put the bike chain on the smallest star. Visually, the roller and small star should be in the same line. The small star is the highest speed, therefore we adjust the position of the roller with the screw H.

Help: the letter H is an abbreviation for high gear, that is, top gear.

The next step is to insure against the possibility of the chain hitting the spokes, which is likely if the derailleur goes behind the largest sprocket. To do this, you need to move the switch to the largest star, carefully and effortlessly. In no case by the roller, the mount of which is very easy to bend.

The adjusting screw fixes the position of the switch exactly so that it is opposite the large star. Going behind it is fraught with the loss of knitting needles and good mood. If the switch is too tight, there will be no lower gear.

Queue for the cable. he must walk freely in a shirt. We check the progress and the absence of creases. On this switch model, you can see the place for the cable to pass. We put the chain on the smallest sprocket, tighten the cable to remove the slack, fix it. Thus, installing the rear derailleur and adjusting it are two integral and complementary processes.

Now check the operation of the entire mechanism. There should be no pronounced clicking sounds when pedaling from the rear derailleur side. Switching up and down should be accurate, without jumping and delays. And even if everything fell into place, it works accurately, quietly and without delay. for the first trip it is worth taking a screwdriver with you. Working with a load may well require minor adjustments.

Note that you will have to deal with such a concept as “preventive maintenance of the switch”, regardless of its price category. As the rollers, which are consumables, wear out, their timely replacement will be required.

It is believed that the installation and adjustment of the rear derailleur is much easier than the front derailleur. However, you will have to spend time and effort, but this work will pay off handsomely during the trip.

Features of adjusting the rear derailleur on a bicycle

High-speed bike owners face issues such as fuzzy gear shifts, chain dropping off the sprockets, and inability to move the rear derailleur. During cycling, the occurrence of such situations brings many inconveniences, so you should fix the problem as soon as possible. You can adjust the rear derailleur yourself.

How the rear derailleur works

The rear gearshift device is a mechanism by which the number of teeth of the driven gear is changed. Such a mechanism was invented back in 1950, and is intended so that the cyclist has the opportunity to facilitate movement.

When moving up, you need to switch to sprockets with a large number of teeth, and when moving on a flat road, you need to switch to stars of a smaller diameter. This will speed up the movement of the bike while cycling. Over time, any mechanism tends to break down, so if you do not carry out regular adjustments, then serious repairs may soon be needed.

To adjust the rear derailleur, you will need to follow the instructions below. Following these instructions will allow speed bike owners to quickly adjust their vehicle so that it does not let down on the road.

Design features and principle of operation of the device

The rear derailleur of different models (Shimano, Deore, Sram, SunRace, Acera, Tourney) has the same operating principle. The main components of rear crossovers on high-speed bikes are:

  • Fastening the entire mechanism to the cock. This fastener is a hole that is designed to be bolted to the bike.
  • The shirt stop adjusts the tension. The rope is pulled or weakened by it. It is in these places that dirt accumulates or corrosion forms, which negatively affects the switching process.
  • The guide is in the form of a kind of lever with a groove through which the cable passes to the fastening bolt. Some designs of mechanisms may not have guides, so the cable is immediately fixed from the stop with a bolted connection.
  • Fixing bolt for securing the cable.
  • Adjusting screw for installing the guide roller.
  • The parallelogram is a movable structural mechanism of the switching device, which, when displaced, moves the foot with rollers in the corresponding direction, while performing a change in speeds.
  • Screws L and H. They are designed to prevent the chain from falling off when changing speeds.
  • The foot is a frame in which the rollers for passing the chain are placed.
  • The guide roller is designed to guide the chain through the rear cassette sprocket. The main purpose of the device is a guide when changing speeds.
  • Tensioner pulley to which the chain is connected from the front sprocket. Excessive chain slack is eliminated by this roller and spring.

The design features of the rear units are identical with only minor differences. The photo above shows how all the structural elements look like. The operating principle of the rear derailleurs is as simple as the design.

  • To change the speed mode, you need to press the steering wheel adjuster.
  • This adjuster is connected to the rear gear with a steel cable.
  • The second end of the cable is fixed with a parallelogram through a bolted connection.
  • When the cable is pulled, the parallelogram is displaced towards the larger star. When weakened. in the opposite direction, that is, to a smaller star.
  • When the cable is loosened, the movement to the smaller star of the parallelogram is provided by the spring.
  • When the position of the parallelogram is changed, the presser foot is displaced in the desired direction together with the rollers: guiding and tensioning.
  • The tensioner pulley is spring-biased, thereby eliminating chain slack. The accuracy of gear shifting depends on this mechanism.
  • The guide roller moves the chain towards the desired sprocket. The chain is fixed by small lugs on the star.

This is how the rear speed changers are arranged on high-speed bicycles, with the exception of planetary ones. Mechanisms with 6,7,8,9,10 and 11 speed systems are now on the market, but the principle of operation is the same for all.

What you need to do before setting up work

Before adjusting and adjusting the rear sprocket, you need to inspect the rear sprockets for dirt and defects. If necessary, it is necessary to clean from dirt and lubricate all the components of the transmission mechanism. Sometimes it is enough to perform cleaning to make the switch function again in the previous mode.

For cleaning the mechanism from dirt and working off, special cleaning fluids are used, which clean all the elements of the mechanism. The cable is checked for integrity and freedom of movement, which must be cleaned and lubricated, or replaced with a new one. The bicycle chain is also lubricated, which is described in detail in another article. The rear cassette and the front system are cleared of dirt and clogging, and only after that you can proceed to setting.

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When all the preliminary measures have been taken, it remains to adjust the rear derailleur, for which there is an instruction.

How to set up and adjust the rear derailleur

Now let’s take a step-by-step look at how the rear derailleurs are adjusted on speed bikes. The setup procedure begins with preparation.

To adjust the mechanism in question, you need to make sure initially that there is no defect in the cock on the bike. If the cock has a curvature, then it must be leveled or replaced with a new one. The most common causes of curvature of the cock are falling from a bicycle or extreme riding. You can visually make sure that the cock is even. If the rollers are not parallel to the cassette stars, then the cock is bent.

You can manually align it without removing it from the bike. To do this, you need to take a suitable size hex wrench and insert it into the hole in the bolt securing the switch to the cock. After that, physically acting on the hexagon, we try to bend the cock in the right direction. It is necessary to bend carefully, since the metal from which the cock is made is fragile, and it is easy to break it. For more accurate alignment of the rooster, you will need to contact a specialized center or change it to a new one.

The second point of the preparatory process is that the quality of the shirts is checked. Shirts are often clogged with dirt, which negatively affects the operation of the cable. You can check the correct operation of the cable in the shirts manually, with little effort. If the cable does not move in the shirts, then the adjustment will be useless until the shirts are replaced.

The third point is the rear derailleur backlash. A strong parallelogram play requires replacement of the entire rear derailleur mechanism. All these checks must be performed even before the start of adjustment work.

If the cock is even, the cable runs freely in shirts and there is no play in the parallelogram, then you can begin to perform tuning work.

How to adjust the high gear limiter

The L and H screws do not affect the adjustment process, they serve to prevent the chain from falling off the cassette stars. For the setup process to be successful, the chain must be positioned on the largest chainring in the front and the smallest in the back. Then we carry out the following actions:

  • The hex bolt that secures the cable to the parallelogram is unscrewed and released. The adjusting cuff, which is needed to fine-tune the cable length, must be fully tightened, both on the switch itself (not available on all models) and on the shifter on the handlebar.
  • By turning screw H, it is necessary to ensure that the derailleur rollers are located on the same imaginary line with the smallest sprocket (the purpose of this procedure is to prevent the chain from falling off the smaller sprocket).
  • The shifter must be switched to the largest number (so that the chain is on the small sprocket). After that, you need to tighten and secure the cable.
  • After it is secured, switch the speed switches to 1. 1, on the system to the smallest sprocket, and on the cassette to the largest.

Clockwise rotation of the screw H contributes to the deflection of the frame towards the larger star in the radius, and against. to the smaller.

Features of adjusting low gear limiters

The purpose of screw L is to keep the chain from flying off the largest sprocket in the cassette. If it is incorrectly adjusted, then during the shift, the chain can fly off and get stuck between the spokes and the large sprocket. Before making the adjustment, the chain must be positioned as follows: on the rear cassette it should be on the largest star in the radius, and in the front on a small.

  • Now you need to adjust the position of the switch rollers with the screw L so that they become in line with the largest sprocket.
  • When the screw L is moved clockwise, the entire unit moves towards the small star, and against. towards the rear wheel.

This completes the adjustment process. It remains to more accurately fine-tune the accuracy of gear shifting by rotating the cuff, and also check the chain tension.

Adjusting the chain tensioner

The tensioner allows the chain to jump smoothly. Tensioning too tight will wear out the system, so you need to check and, if necessary, adjust the tensioner position:

  • You need to switch gears to 1. 1. On the system. to the small star, on the cassette. to the large.
  • If the roller touches the cassette in the process of engaging gears 1. 1, 1. 2, this indicates the need to tighten the third screw (increase the tension). This screw adjusts the distance for trouble-free switching.
  • It is recommended that the distance between the tips of the teeth of these two nearest stars be approximately 5 mm.

After following all the recommendations described above, the choice of the necessary gear when moving the bike should be smooth, without jamming and jumping off the sprockets. After completing the work, ride your bike, flip the switches, and, if necessary, additionally adjust the cable tension with the cuffs.

About mountain biking. How to adjust the rear derailleur

Every cycling enthusiast should know how to properly adjust the rear derailleur. If the mechanism fails, its normal operation will come to naught. To many cyclists, the operation of the rear derailleur seems complicated and incomprehensible, hidden from prying eyes. The mechanism can easily and unpretentiously perform its functions, but one day it will fail. If you have no experience in fixing a similar problem, take your bike to a workshop, where a qualified technician will fix the problem within a few minutes.

You can understand the principles of the rear derailleur. By adhering to our recommendations, you will say goodbye to the difficulties in the further maintenance of the bike on your own.

While the gear shifters are simple at first glance, their optimal setting can seem like a daunting task. Gear shifting is a sequence of actions that loosen and tighten the cable. The cable without which the rear derailleur will not work. Tuning an old and worn out movement or a cheap model made of low quality metal is a big challenge. After just a couple of years of operation, play may form in the switch connections.

How does the rear derailleur work? For the efficiency of tuning, it is advisable to study the device of the component of interest to us. The key principle of operation is based on gear shifting when changing the chain from one drive sprocket to another of a different diameter. Let’s start by comparing the front and rear derailleurs. Structurally, the front derailleur is a regular steel frame that moves in different directions. During movement, this chain shifts to the side, from one sprocket to the next.

The rear derailleur has a more complex mechanism. It has a special spring-loaded foot with small rollers. By dropping the chain onto smaller diameter sprockets, the cyclist uses a shifter to loosen the cable, thereby shifting the chain to the desired sprockets. For chain transfer to a larger sprocket, the shift process is slightly different. In this case, the cable is pulled, after which the foot brings the chain to the star of a larger diameter, friction occurs until it is picked up by the tooth, which will send it to a new gear.

Reasons for malfunction of the rear derailleur 1) Mechanical failure. The gear shifter most often breaks down due to mechanical damage, for example, when a cyclist falls on the track. The first step is to make sure it isn’t bent. Ideally, the foot should be parallel to the cassette stars. If there is even a slight bias, you can judge the deformation of the “cock” (rear derailleur bracket), and not the derailleur itself. Often, after impact, the switch is bent inward, closer to the spokes. Sometimes it hits the needles. It is bad if the frame is not equipped with a removable bracket. then the spokes, derailleur and dropout break. all this leads to frame breakage. The bracket is attached to the frame with a bolt and the rear derailleur is attached to the second bracket. Straightens in a simple way. just pull the switch. But this only works with a slight deviation. Otherwise, you just have to replace the “rooster”; 2) Poor cable lubrication and contamination; 3) Incorrectly adjusted rear derailleur; 4) Deterioration of related parts. Worn out sprockets and flails, rollers in poor condition also lead to breakage. On their own, poor quality rear derailleur models often break down. A lot of problems can be caused when shifting gears and a malfunction of the shifter.

If you experience difficulty in shifting gears and the bike is unruly on the move, take a close look at the bike. When adjusting, do not pull on the rear derailleur foot only, as this may lead to deformation.

The necessary tools are required for you: hex keys or a set of them (3 and 5 mm keys are required), a Phillips screwdriver. Before starting debugging, it is important to make sure that the switch is still functional.

Preparatory phase The gear selector is a delicate mechanism in a hard-to-reach place. Therefore, before starting direct adjustment, it is necessary to eliminate key obstacles to the quality of the procedure.

Pay attention to the cleanliness of the bike, its individual mechanisms associated with the operation of the switch. Take care of your bike chain lubrication. Next, the bicycle chain is transferred to such a position that it becomes on the small stars in front and behind at the same time. To do this, find on the switch the adjusting screws with the inscriptions H and L. It is necessary to unscrew as much as possible the screw under the letter “L”.

Then unscrew the cable tensioner clockwise until it stops. A similar one is located on the shifter. The procedure should be repeated with it. Remember that the rear derailleurs of different models have five key parts: 1) Bolt and nut for securing the cable; 2) Screw with hollowness and cable tension adjustment; 3) Screw for limiting the stroke, is transferred to the largest sprocket (L); 4) Limiting screw for small sprocket (H); 5) Tensioning screw for chain.

Some cheap models do not have cable and chain tensioners. The final preparatory operation is to unscrew the screw that secures the cable directly to the switch. If rust forms, it must be replaced. Slight wear of the part indicates further operation with a prerequisite for cleaning and lubrication. Place the chain on the smallest chainring at the front and the largest chainring at the back, then pedal back. Then the upper roller of the rear derailleur, turning the tension screw, bring it as close to the star as possible, but so that it does not touch it. Such actions will help to achieve a smooth gear change. At the end of the preparation check the ease of sliding of the cable through the “shirt” on the bike frame. Sometimes it needs to be rinsed.

Basic Adjustment Start the adjustment by checking the position of the top roller. it should be on the same vertical line or slightly to the left of the smallest cassette star above it, or slightly offset to the left when viewed from behind. The position can be corrected with the adjusting screw marked “H”. Turn the screw clockwise to move the roller to the left, and vice versa to move the roller to the right. Set up the high gear limiter as follows: 1) put the largest sprocket in the front and the smallest at the back; 2) loosen the shifting cable by unscrewing the switch holding bolt. You can screw in the cable tension adjustments on the switch and on the shifter to the maximum; 3) make sure that both rollers are in the same plane with the smallest sprocket; 4) at the end of the adjustment, it is necessary to pull the cable and clamp it on the switch.

After installing the cable, you need to go to the setting of small gears. Place the chain on the rear sprocket with the largest diameter. Next, check the position of the rollers under the large sprocket. The bolt responsible for the position of the rollers is located under the letter “L”. Adjust the chain if the derailleur has the ability to adjust the tension level. Each cyclist selects the optimal settings for himself. it is advisable to remember them in order to ensure a comfortable use of the bike.

Tension Adjustment Modern models have two spring loaded levers. The bottom one raises the switch frame up, when positioned on small stars. The upper one provides movement of the frame back to the large star. The spring tension of both levers must be balanced for correct gear shifting.

By setting the chain to the lowest gear, when the screw is loosened, the guide roller rises, approaching the sprocket, reducing the angle of inclination of the chain. this improves the quality of shifting. The roller should not touch the sprocket and the gap should be approximately 5 mm. It is advisable to do this procedure when replacing the cassette or when changing the chain length.

How to Shift Correctly After adjusting the rear derailleur, you need to make sure that the gears are shifted correctly. Thoughtless “clicking” of the switch is not the best solution for testing the switch functionality. The key rule is that gear changes are carried out while the bike is moving. Before changing the speed, it is advisable to apply less pedal pressure. Change gears sequentially. If you want to climb a mountain on the move, change the gear to a lighter one before starting the actual climb. To descend from a hill, the same rule is relevant, but only you need to switch to a gear in which it is more difficult to pedal.

Combinations of the right sprocket for different rides Experienced cyclists choose the right sprocket for a comfortable ride for their bike. The most popular combination can be called: for city driving and asphalt roadway outside the city. a large front and between the 4th and 8th rear stars; for cross-country travel or for fast driving on the track. a combination of a large chainring with driven ones (3 and 6); when going uphill. a combination of a small leading star with driven ones (from 1st to 3rd).

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Too much skewing of the chain will shorten its life. As soon as there is a sudden extraneous sound when driving, stop immediately and check the switch for faults.

Maintenance of cables and shirts Sometimes it is enough to keep the shirts and cables clean and lubricate them regularly with liquid oil. It is then much easier to adjust the bike’s rear derailleur. Switches of different rulers and manufacturers serve different periods. it all depends on the price range. But even the durability of cheap switches can be extended with gentle handling and care.

A cable shirt is needed to keep out dirt. If you find a torn cable with loose threads, then hurry up to replace it with a new one. In case of cable corrosion and constant jamming in the jacket, it is better to treat it with graphite grease. Then the rear derailleur adjustment will advance faster and the gear changes will remain as smooth as before. Damaged shirts should be replaced.

Diagnostics of the problem with the rooster If the chain throwing by the rear derailleur fails, there is a reason to check the rooster for serviceability. The rear derailleur is often damaged. There is a huge load on it. Often from a strong blow to the log and the curb, the “rooster” bends or bursts. Therefore, make sure that the two tensioner rollers are strictly vertical to each other.

The dissonance of the geometrical parallels of the rollers means breakage. The chain, passing along the rollers, must be strictly vertical. without distortions. Do not level him in a field, forest, snowy mountains. Trying to straighten it by hand will only bend the switch frame. Experts do not recommend that you straighten the bent “cock” by pulling the switch. Its frame is very fragile. First, it will bend, then the fasteners will deteriorate. this will only aggravate the situation with the repair. It is better to completely remove the cock, spread it out on a flat surface and use tools in attempts to straighten.

Following our instructions, you can independently consolidate your theoretical knowledge of the bicycle in practice. No one but you can actually make it work: only you know all its pros and cons.

How to install a speed switch on a bike. How to put a rear derailleur on a bike

Having traveled many roads on a bike, you are convinced that buying stylish grips and choosing the right tires is not enough for a comfortable ride, it is much more important to have a branded rear derailleur, which will be correctly installed and configured.

The gearshift mechanism was invented by Tullio Campagnolo in 1950. This discovery made a splash among bike manufacturers, who from that moment on, polls began to equip new models with this device.

The main purpose of the mechanism is to increase or decrease speeds by throwing the chain over the stars in the cassette. In addition, the rear derailleur on the bike prevents the chain from sagging by keeping it taut. than half a century has passed since the invention of the device, during which time many of its varieties have been created.

The number of gears that you can choose depends on the length of the frame: the longer it is, the more speeds are provided by the design of the bike. However, it is impossible to say unequivocally that a long frame is better, someone likes a short frame that is not afraid of stones. And here everyone is right in their own way!

What is the rear derailleur made of?

The material of manufacture can be different: from stainless steel to titanium. On budget bicycles, as a rule, steel and plastic derailleurs are installed. such products are short-lived, work poorly. Models of the middle price segment are equipped with an aluminum movement, and the most expensive ones are composed of composite, carbon and titanium.

Installing the rear derailleur on a bicycle

Owners of an old bike, equipped with a switch of an unknown brand, always reach out to “bring it to mind.” Often, with a device assembled independently from spare parts of various brands, many problems arise: from the constant throwing of the chain over the star to the complete “sabotage” of the movement. Therefore, it is easier and cheaper to “get hold of” a new one, rather than trying to adjust and repair the rear derailleur on a bicycle, which is already hopelessly damaged.

For a bike that is used periodically and only on flat roads, it is impractical to install an expensive derailleur of famous brands (Shimano, Sram, etc.). However, if you plan on rolling hills and slides, pay attention to mechanisms with a large range of speeds.

Replacing the derailleur on a bicycle: a sequence of actions

  • The replacement process begins with removing the old mechanism from the frame. To do this, open the chain link, unscrew and remove the old switch.
  • Next, to the “cock”, which is a protruding triangle with a hole, we fix a new mechanism. It should be screwed on well, but not too tight.
  • Then we install the chain on the smallest star so that the roller and the star are visually located on the same line.
  • Carefully slide the derailleur back to the largest sprocket without holding onto the roller, which is easy to bend. Thus, you will be insured against the risk of the chain hitting the spokes.
  • Using the adjusting screw, we fix the position of the switch so that it still remains opposite the large star. If the mechanism hits the star, then you can lose the spokes, too much clamping is fraught with failure of the lower gear.
  • Moving on to the cable. normally it should move freely in the shirt. It is necessary to check the absence of creases and the course itself. To do this, we install the chain on a small star, pull the cable and fix it in a taut position.
  • We check the operation of the mechanism. First of all, turn the pedals. there should be no clicks in the process, and the very switching of speeds up and down should be smooth, without jumping over the stars and without delays. At first, it is better to take a screwdriver on a bike ride. under load, the mechanism may need to be adjusted.

Regardless of the mechanism of which company you choose, sooner or later you will have to face preventive maintenance. After all, the rollers are consumables and wear out as the bike is used, so from time to time it is necessary to carry out their preventive replacement.

Many people think the rear derailleur is much easier to set up than the front derailleur. In both cases, you will have to make some effort, but this work will pay off more than comfortably while riding. If you don’t want to waste time installing the derailleur. contact us for a bike repair service.

How to install a rear derailleur on a bike?

Having clocked many kilometers on a bicycle, I was convinced that a branded derailleur is much more important for a comfortable ride than stylish grips or leather Brooks. But it’s not enough just to buy Shimano or Sram, the quality of installation and setup is important.

A bit of boring theory

The rear derailleur mechanism throws the chain over the cassette stars, allowing you to lower or increase gears (for reference, it was invented by the Italian Tullio Campagnolo back in 1950). This device also keeps the chain taut. There have been many varieties since the invention. A little about the main, most characteristic features.

  • Manufacturing material. From steel to carbon. The entry-level models are equipped with steel, and not always of good quality, and plastic. In the right hands, these switches even work sometimes. Models of the middle category are in most cases made using aluminum. The most expensive models can boast not only precision in work, but also titanium, carbon or composite.
  • Frame size. In theory, everything is simple. the longer the frame, the more gears you can select. However, one cannot say so categorically, since someone will prefer a short frame that is not afraid of stones, while others are interested in greater comfort in switching. And everyone is right in their own way.

You can still describe in detail the action of the spring or the options for the location of the cable for a long time. However, many good articles have been written on this topic. I will only note that there is not much difference from which side the cable enters the switch. So, now about the interesting.

Installation and adjustment

And putting something more serious on an inexpensive bike used only for riding exclusively on asphalt is pointless. Switching range was important, however, as the city is teeming with hills, hills and mountains.

So, replacing the rear derailleur starts with removing the old noname from the frame. it’s time for Shimano. The chain link is revealed. If this is not the case, then you need to use squeeze.

The old switch is unscrewed and removed, and a new one is hung in its place and screwed to the “cock”. a protruding triangle with a hole in the frame. It is worth tightening well, but without undue enthusiasm.

We put the bike chain on the smallest star. Visually, the roller and small star should be in the same line. The small star is the highest speed, therefore we adjust the position of the roller with the screw H.

The next step is to insure against the possibility of the chain hitting the spokes, which is likely if the derailleur goes behind the largest sprocket. To do this, you need to move the switch to the largest star, carefully and effortlessly. In no case by the roller, the mount of which is very easy to bend.

The adjusting screw fixes the position of the switch exactly so that it is opposite the large star. Going behind it is fraught with the loss of knitting needles and good mood. If the switch is too tight, there will be no lower gear.

Queue for the cable. he must walk freely in a shirt. We check the progress and the absence of creases. On this switch model, you can see the place for the cable to pass. We put the chain on the smallest sprocket, tighten the cable to remove the slack, fix it. Thus, installing the rear derailleur and adjusting it are two integral and complementary processes.

Now check the operation of the entire mechanism. There should be no pronounced clicking sounds when pedaling from the rear derailleur side. Switching up and down should be accurate, without jumping and delays. And even if everything fell into place, it works accurately, quietly and without delay. for the first trip it is worth taking a screwdriver with you. Working with a load may well require minor adjustments.

Note that you will have to deal with such a concept as “preventive maintenance of the switch”, regardless of its price category. As the rollers, which are consumables, wear out, their timely replacement will be required.

It is believed that the installation and adjustment of the rear derailleur is much easier than the front derailleur. However, you will have to spend time and effort, but this work will pay off handsomely during the trip.

How to install and adjust the front derailleur on a bicycle

If you are an avid cyclist, you will certainly have to face the need to install or adjust the front derailleur on your bike. You may need this for a variety of reasons. For example, the shifting system will need to be replaced or the cable will stretch. We will tell you about the correct implementation of this procedure in this guide.

Forward Bike Shifter

Front derailleur device

The design of such a system is quite simple. We list the main components and their functional features.

An element designed to attach the device to the frame of your bike.

An element in the construction of which there are hinges and a special spring. This element got its name because of the parallelogram shape. It represents the main moving part of the device, and also a frame is attached to it, about which a few words below.

A detail in which both the outside and the inside play an important role. A chain runs along the inside of this element.

And these elements are also called constraints. These are two bolts that are used to restrict the movement of the frame both towards the bike frame and in the opposite direction.

Another bolt that holds the shift cable.

Operating principle

The first step is to understand how this device works if you want to understand how to set up the front derailleur. The function of this device is to move the bicycle chain to the desired chainring. As the gear shifts from a larger chainring to a lower chainring, the tension in the cable is reduced, causing the spring to pull the parallelogram along with the guide frame towards the frame of your vehicle. The frame with its outer side presses on the chain, and it goes to a sprocket with a smaller diameter. The reverse process is carried out in the same way. Stretching, the cable moves the parallelogram together with the frame in the opposite direction. The frame presses on the chain and throws it onto a large star.

As you can see, a well-tuned switch is a simple and reliable device. The correct setting of the limiters is of great importance, since the parallelogram rests against them, reaching the extreme positions. If the position of the limiters is not set correctly, the chain will constantly jump from the right place.

Preliminary actions

If you have to install a new switch or are preparing to configure an already installed system, before proceeding, you need to check a number of parameters.

It is necessary to inspect the system and check for backlash or damage. It so happens that after prolonged use on some parts, for example, a guide frame or parallelogram, gaps form. And also parts, especially the frame, can get damaged and bent from loads and falls. This can cause problems when adjusting the front derailleur of your bike.

Be sure to thoroughly clean all parts of the device from dust and other contamination, then apply grease. First of all, it is necessary to lubricate all moving parts of the device, namely the springs and the parallelogram itself. If necessary, you can remove the shift system from your vehicle frame. These actions will also contribute to a better visual inspection, which was discussed in the previous paragraph.

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And it is also necessary to clean the switch cable and check its integrity. If the cable is very dirty, you can detach it from the fixing bolt and pull it out, but it can also be cleaned without removing it. Then, inspect the cable for broken wires. Then, if everything is in order, the cable also needs to be lubricated.

  • Check the rear derailleur.

It is required that the rear derailleur has already been tuned as it is used as the master during tuning.

Getting started with installation and configuration

After all the initial activities, it’s time to figure out how to set up the front derailleur on your bike.

  • The first step is to correctly position the device. The correct position is the following: the longitudinal axis of the guide frame must be parallel to the chainrings. The distance from the very bottom of the frame to the largest sprocket should not be more than 2 mm, and at the same time it should not cling to the teeth. During alignment, the parallelogram is folded away from the frame towards the largest star. Positioning will be easier with the chain removed. Many branded switches have a special sticker with level markings for easy installation.

Big bike star

  • We slightly tighten the bolt that fixes the clamp, and once again check the location of the guide frame. If everything is in order, tighten the bolt to the end.
  • We have completed the installation, now we have to adjust the front derailleur on the bike. The easiest way to do this is on a bike with the rear wheel up. To achieve this, the vehicle can be suspended from the saddle or otherwise secured.
  • Let’s start by setting the lowest speed. Please note that the cable must be free when doing this. We adjust the cable tension by twisting it all the way, then return it a few turns back. Often the adjustment is tightened to the end, but fine adjustment requires a small margin of tension.

Forward Bike Shifter

  • We also set the lowest speed on the rear derailleur. It is necessary that you have the first speed set both in front and behind.
  • We expose such a position of the limiting bolt L, in which the inner part of the guide frame is located as close as possible to the chain, but does not cling to it when pedaling. If you need the frame to move towards the bike frame, rotate the stop counterclockwise and vice versa.
  • Replace the cable and then tighten the fixing bolt. Twist by hand, no need to use pliers.
  • Now shift the gears so that the front chain is set to the largest sprocket and the rear to the smallest. Adjust the second stop bolt H. Now you need to ensure that the outer part of the guide frame is as close to the chain as possible, but does not cling to it while driving. Rotate the stop clockwise to move the frame towards the bike frame, and vice versa.
  • Now we have to adjust the front derailleur of the bicycle. Set the rear derailleur to fifth gear. Then, while pedaling, change the front derailleur speeds over the entire range (3. 2. 1. 2. 3). Repeat the procedure two to three times, then set the second speed in front and start shifting reverse gears. It is necessary to ensure that the chain does not rub against the guide frame in the following positions: 2. 2 and 2. 7. If friction is present, the cable tension must be additionally adjusted. If there are problems with the transition from a larger chainring to a smaller one, it is necessary to release the tension, and if difficulties arise when changing from a smaller chainring to a larger one, increase.

Adjusting the bike speed switch

Testing the work done

When the installation of the front derailleur on your bike is complete, you can start testing. Select a straight section of road that is free of sharp descents and ascents, and test the device while driving. If you find any functional problems, you can make adjustments on the go at low speed. With a little skill, you will learn how to easily adjust the front derailleur on your bike.

How to properly shift gears on a bike. How to determine the number of gears on a bicycle, what is the principle of transmission, basic rules and recommendations for shifting gears.

Correctly selected snowboard bindings are the factor that can ensure a comfortable ride on a ski equipment. Choosing the perfect mechanism.

Timely replacement of the gearshift cable on a bicycle is a guarantee of the normal functioning and integrity of the mechanism. Replacing the cable is a simple procedure, it is quite possible to do it yourself.

Setting the front derailleur

Setting the front derailleur

Adjustment, setting the front derailleur is not difficult if you do everything carefully and consistently, but first you need to set up the rear derailleur, and then proceed to the front.

install, speed, switch, bicycle

The whole process can be divided into three stages:

1) Preparation; 2) Adjustment; 3) Checking;

To set up we need:

1) Shaped screwdriver;

4) Key for 9 (in some cases, you need a 4-5 hexagon);

5) Cable and cable jacket (if yours are in poor condition);

The first stage is preparation.

First, check the cable and cable jacket (to do this, loosen the tension cable and take it out of the jacket), make sure that the cable is not unraveled anywhere, the cable jacket is not “wrinkled”. If there are no kinks and unweaving, and the cable still moves tightly in the shirt, clean it from dirt, sand and lubricate.

Next, wash and clean the front derailleur, wipe and dry well, and then lubricate all moving parts.

Twist the thumbscrew, which is located on the shift coins, almost to the very end (leave a couple of turns for adjustment). At this stage of preparation is over.

The second step is setting the front derailleur.

Position the derailleur so that, if you were looking at it from above, the derailleur frame is parallel to the chainrings. (to adjust the height and angle of the switch, loosen the clamping bolt)

In order to adjust the height, set the chain on a large sprocket, the gap between the frame and the large sprocket should be 2-3 mm. The smaller this gap, the better switching

Next, you should adjust the “blockage of the chain” (so that the chain does not fall when switching to lower and higher gears)

If you look at the switch from above, you can see two adjusting screws H.High (high) and L.Low (low). these screws are responsible for adjusting the “chain blockage”.

Place the chain on a small sprocket in the front and a large one in the back.

Begin to rotate the L.Low screw (low) until the chain is as close to the inner plate as possible, but make sure that the chain does not hit the frame when pedaling. Next, pull the cable with pliers and tighten the cable fastening screw.

Now you need to do the same with the H.High screw. We put the chain on the big star in the front and on the small back. Turn the screw H (High) until the chain is as close to the outer plate as possible, but so that when pedaling the chain does not touch the frame.

Now you need to check how the switch works by rotating the pedals (put the bike on a stand or hang the rear wheel), step by step change gears in both directions. If it does not switch well from large to small stars, it is necessary to loosen the cable by rotating the “lamb” on the coins, clockwise, and if it does not rise well from small to large, counterclockwise.

Stage three. checking the front derailleur.

After we have tested the derailleur on weight, we need to do it under load, sit on the bike and drive through the gears. The front derailleur should work smoothly and clearly, the chain should not rub against the frame.

What problems can be when setting the front derailleur?

1) Incompatibility of the front derailleur and system.

It happens that when you replace or install a new switch, you have the wrong switch. In general, they are of three types: with an upper cable pull, with a lower cable pull and universal, and each switch is designed for a specific system and number of teeth. Therefore, when buying a switch, look what you had, and if you don’t know, take it with you for a sample.

2) It is not possible to adjust the front derailleur, the chain constantly rubs against the frame

First, check the parallelism of the switch installation, if everything is ok, check the system, if it is bent, if the sprockets are even, make a couple of pedals and look at them, the stars should not change the axis of rotation.

3) Friction of the chain on the derailleur frame when at a speed of 3-1.

Do not forget about the concept of “chain skew” in the position when the chain is located diagonally it is not recommended to ride. this can lead to chain stretching and damage to the front derailleur.

Also, when changing gears, do not forget to relieve pressure on the pedals.

If you are unable to adjust the front derailleur, do not hesitate to contact us, our bike workshop will be happy to help you.

Setting up bike derailleurs (for beginners)

Setting up bike derailleurs (beginner’s guide)

So, let’s continue our series of articles for beginners. Recall that in previous articles we looked at how to take care of your bike and correct gear shifting on the move. In this article, I would like to make a short guide to self-tuning or even complete customization of the bike after purchase.

There are many reasons:

Opinions on how to set up a bike and where to start differ, many say that you must first set up the front derailleur, and then the rear, others vice versa. The essence of this does not change, but it is really recommended to first adjust the rear derailleur in order to more correctly configure the front.

Bicycle Rear Derailleur Setting

First, we’ll look at the design of the switch itself:

On more modern switches there is also a switch tension adjustment screw, but we will not consider it, since it is generally not needed in setting.

Tuning mechanism

Shifting the rear derailleur to the smallest star

Unscrew the rear derailleur cable clamp screw and loosen the cable

Install the chain on the front derailleur to the middle sprocket (click the left coin on the steering wheel)

We spin the pedals on the weight, if the flail falls off the stars, it means that the screw marked “H” must be tightened by 1-2 turns, if after that the chain is in place, but at the same time it tries to switch independently to the next gear. we unscrew this screw by 0.5.1 turn

The essence of this method is that when the rear derailleur cable is unscrewed, use the screw “H” so that the rear derailleur and the smallest sprocket in front are absolutely in line, this is easy to check, just look at the rear of the transmission from the side of the stars.

If everything is ok, then move on. we pull the cable by hand and tighten the bolt to fix the tension

Try it. click the rear derailleur shift knob 1 speed up, if the switch was correct, click further to the largest star, if not, then pull the cable with an “adjusting drum”. We unscrew the drum by 1 turn, try if ok, continue to click further, if not switch another 1 turn.

So, we got to the largest star at the back, but when switching, 2 situations can arise:

a) the chain falls off behind a large sprocket. then it is necessary to tighten the adjusting screw “L” by 1-2 turns

b) it is impossible to switch to the largest star at the back, the shift knob does not click or the switch itself simply does not switch. then the bolt marked “L” should be unscrewed by 1-2 turns.

That’s all we have set up the rear derailleur of the bike. All adjustments by bolts “H” and “L” are made slowly, you should unscrew / tighten no more than 1 turn at a time, maybe even 0.5 turn, in order to set the switch as correctly and quickly as possible. Let’s move on.

Front derailleur setting

When adjusting the front derailleur, there are nuances that depend on the derailleur itself (foot width) and transmission (6/7/8 and more speeds). We take a look at the most popular ShimanoTourneyFD-TX50 and ShimanoAceraFD-M360 derailleurs.

Switch to the smallest star in the front and the largest star in the back.

Unscrew the front derailleur cable

We adjust the switch frame with the screw “L” so that when installing the switch, the inner part of its frame (the one that is closer to the bike, when viewed from above) does not touch the chain. tighten if the distance to the chain is more than 3 mm or unscrew if less.

After that, we pull the front derailleur cable, but not tightly, so that when you tighten the cable tension screw so that the cable is slightly relaxed (dangling in a horizontal plane by about 1-1.5 cm)

We switch to the middle star and start checking. we install the second star behind, that is, not the smallest one, but the next one. We check. if the chain touches the outer frame of the switch, then we stretch the cable, on the shift knob we have the same plastic bolt as on the rear derailleur, unscrew it 1-2 turns, so that the distance of the chain from the outer frame of the switch is 3-4 mm.

Moving on to setting the largest sprocket. switch the rear derailleur to the smallest sprocket and watch. If you switched without problems, then we do not turn anything, if it did not switch, that is, there was a click, but the switch did not switch, then we unscrew the screw “H” by 1-2 turns, if it switched and the chain slept, then we tighten this screw by 1-2 turns. We check further. the distance to the outer frame should be no more than 3 mm when turning on the smallest star from behind. If everything is ok, then you did everything perfectly.