How to Mount the Rear Derailleur on a Bicycle

Rear derailleur

The rear derailleur was invented by the Italian Tullio Campagnolo and was first used in 1950. Its main purpose is to switch the reverse speeds of the bike. Since the switching of speeds is carried out by transferring the chain from large stars to small ones and vice versa, the chain tension must also change. The rear derailleur is also responsible for the chain tension. The rear derailleur is controlled by a lever on the handlebars of the bicycle via a cable.

The device and principle of operation of the rear derailleur

The rear derailleur is a gear shifting mechanism that allows the chain passed through its frame and rollers to move along the stars of the rear cassette or ratchet. The chain is thrown by moving the switch along the axis of the cassette (ratchet), and the switch can also be moved in the vertical plane to maintain a constant distance from the rear sprockets to the roller.

A cable drive is most often used as a switch drive, less often hydraulic or electric. Moving from small stars to large ones is carried out by pulling the cable, and in the opposite direction by pulling the chain.

The speeds must be switched while pedaling, and at a light load. By adhering to this rule, speeds will shift more clearly and the life of the switch will be maximized.

Rear derailleur device

Manufacturing materials

The metal from which the switch is made affects not only the price, but also the weight of the structure, as well as strength. The cheapest are the rear derailleurs made entirely of steel alloy. The disadvantages of such switches are low strength and susceptibility to metal deformation. Steel derailleurs are used on lower end bikes. The most advanced switches are made from titanium and carbon fiber. The spring in these rear derailleurs is titanium and the frame is carbon. Something in between and the most popular is the aluminum alloy. Despite the fact that the switch is considered aluminum, some parts are still made of steel (Adjustment bolts, spring).

Rear derailleur rollers

In order to tension and guide the chain, the derailleur has two rollers. tension and guide. The rollers are usually made of plastic and are consumables. Since they wear out quickly, they need to be replaced periodically. The more worn out the roller, the less clear the gear change will be. The tension roller and the idler roller between are not interchangeable. In addition, videos from different manufacturers are also not compatible.

Rear derailleur rollers

Rear Derailleur Design Types

Sooner or later, the rear derailleur wears out and it becomes necessary to replace it. Then the question arises about the interchangeability of the rear derailleurs. Switches can be classified into types based on the following parameters:

  • Switch frame length. this parameter is responsible for the so-called switch capacitance. That is, the length of the derailleur frame is responsible for the gear ratio range that the rear derailleur can operate with. Simply put, the capacitance of the derailleur is the sum between the difference between the small and large stars of the cassette and the system. For example, if the cassette is 11-32T, and the system is 22-44T, then the required capacity can be calculated using the following formula. (32-11) (44-22) = 43T. 43T is the minimum allowable capacity of the rear derailleur. The numbers indicate the number of teeth of the stars.
  • Spring Direction. Indicates in which direction the switch is operated by the spring. The most popular direction is Top normal, that is, cable shifts are carried out from a smaller chainring to a larger one. All rear derailleur manufacturers adhere to this principle. But there is also a reverse direction (Low normal), when the chain is dropped by a cable to small stars, and switching to large stars is carried out by a spring. Rear derailleurs with this direction are only found in the Shimano range. These switches do not have significant advantages, and therefore did not gain popularity.
  • The drive ratio is the ratio of cable movement to derailleur movement. This ratio can be 2: 1 (Shimano) or 1: 1 (Sram). It is these indicators that do not allow the switches of these manufacturers to be interchangeable. It should be noted that there is no difference in the clarity of gear shifting from this indicator, although Sram claims the opposite (in practice, there is no evidence).

Cable feed to derailleur

There are two ways to feed the cable. straight and traditional. The traditional approach is to bypass the dropout. With a direct feed, the cable is attached to the switch from the top and is laid along the shortest path. Direct supply has its advantages. lower weight and no loop that can catch on an obstacle. A special adapter can be used to lead the cable directly to the derailleur with traditional cable attachment. Avid Rollamajic.

Traditional cable feed

Direct cable routing

Cable inlet through Awid Rollamajic adapter

Rear Derailleur Mounting

There are two types of rear derailleurs on a bicycle, regarding their attachment to the frame:

  • Under the hook. the switch is attached to the bicycle hub. Such a mount is more reliable, but has a strong drawback. with a strong impact and breakage of the switch, the bushing also breaks, which entails high costs.
  • Under the bolt. such switches are attached either to a special hole in the frame, or to or through the “cock”. special adapter. The advantage of the rooster is that with a strong blow, neither the axis nor the switch breaks, but only the cock. The cost of a rooster is incomparably small compared to a derailleur and a bushing.

Bolt-on rear derailleur

Rear derailleur for hook

Mount holder (Rooster) rear derailleur

Rear derailleur protection

  • Shadow Technology. Shimano patented technology. Switches based on this technology protrude much less when positioned on small sprockets. This arrangement increases the chances of survival of the switch and cock during a side fall.
  • Safety frame. This is a steel frame that attaches to the bike frame and covers the derailleur. This protection also increases the chances of the cock and the switch being left intact.

Rear derailleur protection

Shadow technology

How to adjust the rear derailleur on a bike. How to properly adjust the rear derailleur

To independently adjust the rear derailleur on a bicycle, you just need to strictly follow the step-by-step instructions from experts in this process. So, follow all the steps:

  • Move the chain to the small sprocket with the right shifter.
  • Unscrew the fixing screw and release the cable.
  • Find the screw with the “H” mark. Use a screwdriver to adjust this screw so that the smallest star lies in the same plane with the rollers, which are located in the foot (frame).
  • Pull the cable by hand and fix it with the screw.
  • Check the operation of the switch, and if it does not work correctly, the chain does not switch well to large stars, then you need to tighten the cable harder (either with the help of a drum or with a switch).
  • Move the chain to the largest sprocket available in the cassette.
  • Find the screw marked “L” and adjust it so that the tab (frame) and the sprocket are in the same plane. in this case, the crossover will not be able to get into the spokes of the front wheel.

CORRECT SWITCHING

Correct gear shifting is determined by one main rule, the observance of which is very important. when driving you need to make sure that the chain does not twist. This can happen if the chain is engaged at opposite extreme positions of the chainrings and chainrings. With this arrangement of the chain, it clings to all possible and impossible obstacles, is exposed to uneven load and wears out much faster.

Here are some tips to help you switch gears correctly:

  • Better not switch gears when driving downhill. The first thing that will happen to you is the loss of your riding rhythm, which will affect your stamina and movement speed, respectively. This is also not worth doing, since when going uphill, the chain tension is already quite high, and if, at the same time, throwing a chain between the stars. Such actions will adversely affect the resource of parts, and, soon, a breakdown may follow. So you need to switch gears before lifting, at the moment of the greatest relaxation of the chain.
  • A huge number of cyclists rarely use the front derailleur on their bike. Why it happened so is difficult to answer, but, nevertheless, it is a fact. It is much more efficient to use forward gear when driving on a sloping road. One shift on the chainrings, in this case, will have more effect than two or three changes on the rear. Just put the chain in the back on the middle sprocket and shift the front.
  • When a fairly serious descent is planned on your way, then, again, change gears before starting to go down. This is due to the fact that when the process of driving downward begins, it is better not to be distracted from the brakes, and you will need to follow the road especially carefully, because falling on the descent is an unpleasant thing.
  • Gear shifting should be smooth. There should be no rumbling, grinding, knocking or other extraneous sounds. If you follow this, the gearshift system will serve you for a much longer time.

SHIMANO SWITCH

However, the shifter is a kind of “heart” of the transmission system and, for the most part, it is he who is responsible for the quality of gear shifting. Today, a limited number of companies manufacture high quality derailleurs, and the most popular among them is the Japanese giant Shimano.

For the convenience of customers, all Shimano derailleurs are divided into groups. Let’s dwell on each of them in order:

  • Shimano Tourney is the easiest beginner derailleur. They are distinguished by their low cost and high reliability. Bicycles equipped with components of this class are designed to be used at a leisurely pace on the track or on tightly packed soil. This Shimano derailleur cell needs constant adjustment and starts to fail if too much dirt gets on it. Fits Shimano 2300 Road Group.
  • Shimano Altus / Acera is also the entry-level equipment. But Acera derailleurs are already installed on bicycles designed for use in sand and mud, of course only at the amateur level. For those people who, for whatever reason, cannot get more expensive options and ride both on the ground and on asphalt, this type of Shimano derailleur is ideal. Fits Shimano Sora Road Group.
  • Shimano Alivio. This group of equipment is something in between, it cannot be called professional yet, but it is no longer amateur. Equipped with Alivio derailleurs, the bikes are great for recreational riders and cycling trips. This Shimano derailleur group is reliable and unpretentious. The price-quality ratio in this group of switches is implemented most successfully. Fits Shimano Tiagra Road Group.
  • Shimano Deore is a professional line of derailleurs, but if you look at things soberly, the differences from the Alivio are not that great. All that changes is the indicators of lightness and reliability, they get a little better, but the price increases significantly. Fits Shimano 105 Road Group.
  • Shimano Deore SLX and XT are lightweight and reliable professional equipment. The reliability of the Deore SLX / XT derailleurs is eloquently reflected in the value: the price of a Shimano Alivio rear derailleur is approximately 45. and the Deore costs between 90 and 110 Ideal for professional athletes to train every day. Fits road groups. Shimano Ultegra and Ultegra Di2.
  • The Shimano Deore XTR is the ultimate racing equipment. Not afraid of any stress. Extremely expensive. Fits Shimano Dura-Ace Road Group.

Shimano doesn’t just make derailleurs for mountain and road bikes. There are many derailleurs available for touring, city and adventure bikes. But we do not consider them, since these bicycles are not popular in the CIS.

ADJUSTMENT AND ADJUSTMENT

Sooner or later, any bike enthusiast begins to notice that the gearshift system emits extraneous sounds, such as crunching, rumbling, etc. It happens that during a gear change, the chain jumps a couple of sprockets or the opposite situation: you cannot switch to the required sprocket. So what’s the deal? You just do not have gear shifting configured. So how do you set your bike speeds? Let’s try to figure it out.

The gearshift setting can get lost because you are not familiar with the gearshift rules and are shifting them incorrectly. Or your gearshift system is simply too dirty and needs to be flushed out. But the reasons are a separate conversation, and we will focus on setting.

Let’s not go into the nuances of professional tuning. professional cyclists are unlikely to search for speed settings on the network. Therefore, let’s move on to a short rate setting course:

  • Secure your bike with the wheels upside down (using a special stand or simply placing it on the handlebars and seat). The speed setting is carried out using special bolts on the switch.
  • Now you need to set the chain to the leftmost positions (on the large chainring and small rear). After that, unscrew the part that serves to fix the cable to completely unhook the cable.
  • Now, tightening one of the bolts on the speed switch, you need to adjust the two gears so that they are opposite one another. You will know which bolt to turn by the “H” or “High” mark next to it. What does high speed mean?
  • After that, we install the chain in the rightmost positions of both stars (on the largest rear and smallest in front). Adjust the gears again with the second screw, which is marked “L” or “Low”. Putting the stars in one line.
  • Now, you need to install the chain on the middle sprockets at the front and rear and adjust the gear shifting as precisely as possible using a screw called a “wing” and located directly on top of the cable. It must be remembered that our goal is to ensure that the middle gears are opposite one another. Before you start twisting the “lamb”, it is better to perform a test drive, which will give an idea of ​​how difficult it is to switch or, conversely, too easy.
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Putting the asterisks one opposite the other, do not worry if there are slight inaccuracies, plus or minus a couple of millimeters does not affect anything: the system does not provide such accuracy. But still, gear shifting will be slightly better if the stars are aligned. For this reason, after the test ride, it will become extremely clear in which exact place you need to do more detailed settings.

ADJUSTING THE FRONT SPEEDS OF THE BIKE

You need to adjust the forward speeds in about the same way, there is nothing difficult there, and you can figure it out at the level of intuition, therefore, we will consider only some points. The chain runs along the chainrings with a metal stop that can be adjusted with two bolts. The principle is the same, so, as mentioned earlier, there is nothing complicated about it. And, again, in order not to suffer again with the setting, switch the speeds correctly, as described above.

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

So, replacing the rear derailleur begins 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”. 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 should 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 / 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.

Installing the speed switch on the bike. How to adjust the speed switch on a bike

It often happens that either the speeds on the bike are not switched clearly, or some new transmission elements have been installed. In this case, you will need to adjust the speed switch and it is quite possible to do this work on your own, without contacting specialized workshops.

Necessary terminology

To understand the process of self-adjusting the speed switch, you need to know the definition of some specific terms, otherwise it will be difficult to understand the instructions.

Things to remember:

  • Speed ​​switch (override). This is a transmission element that is specifically responsible for gear shifting. If there is a rear overhang, then it also acts as a support for the tension of the bicycle chain. The crossover (back and front) can be described as follows: it is a parallelogram mechanism equipped with a powerful return spring, on which the frame is fixed. The rear derailleur has two rollers inside the frame. if the level of cable tension rises, the frame shifts the chain to large stars, and if this cable tension decreases, then the chain is shifted towards small stars with the help of the frame. The mechanism of the front derailleur works in the same way.
  • Shifter. It is designed to switch speeds by changing the tension level of the cable. Most often, the shifter is located on the handlebars, but in some bicycle models it can also be located on the lower tube of the frame triangle. Note:shifters and speed switches have a common connection on the steering wheel (this is provided by a cable) and are covered with a jacket.
  • Cassette. This is the name of the rear transmission unit, which consists of stars of different sizes (of different diameters and with a different number of teeth) and is installed on the rear hub drum. If the bike model is old, then a ratchet is used instead of a drum in the rear hub.
  • Cock. This is a metal part that helps to maintain the integrity of the frame and rear derailleur in the event that the vehicle has been hit. The rooster is always attached to the frame, and a cross-over is already attached to this metal part. When a blow occurs, it is this very cock that breaks down, and the frame and the speed switch (crossover) remain intact.
  • System. This is the name of the front transmission unit, which consists of stars of different diameters and with a different number of teeth. These stars are fastened to each other and the connecting rods with special hollow bolts on the connecting rods, but you need to know that there are no hollow bolts in cheap bicycles. the stars and connecting rods are riveted together.

Why is there a violation of gear shifting

To understand what action should be taken to adjust gear shifting, you need to understand what causes may lead to the problem under consideration. Experts identify several such predisposing factors:

  • deformation of the rooster;
  • stretching the cable;
  • deformation of the speed switch;
  • malfunctioning return spring.

How to fix defects

The speed switch will work perfectly and the bike itself will be with a new (or not very old) cable, with absolutely intact shirts (and not dry!) ​​And not deformed (or in a small volume) stars and chain.

If the cable is just stretched, then you just need to pull it up. But if the cable breaks, then you cannot do without replacing this element. The process of replacing the cable is not difficult, the main thing is to strictly adhere to the recommendations of specialists:

  • unscrew the cable fixing screw, which is located on the cross-over;
  • pull the cable out of the shirts;
  • if necessary, disassemble the shifter and pull the cable out of it;
  • a new cable must be inserted into a special groove in the shifter, and it is the metal tip of the cable that must enter into the groove;
  • lubricate the entire cable with a special grease, you do not need to spare the consumable;
  • pass the cable through the shirts;
  • there are special grooves on the frame, into which shirts are tucked;
  • fasten the cable with a screw on the front.

In case of poor gear shifting, pay attention to the return spring. it must be clean and lubricated. To achieve this, you just need to rinse the spring under running water, dry it completely and lubricate it thoroughly.

If the frame of the rear derailleur is crooked, then this can only mean one thing. the cock is bent. If this is not critical, then you can correct the cock with your hands. you need to take the rear switch in your hand, which is fixed on the cock, and with the other hand hold the frame. Slowly pull out the problematic transmission element (rooster) until relatively level.

Note: this “repair” of the cock is a temporary solution to the problem of shifting gears. The fact is that the rooster is a consumable that needs to be changed in time, and not constantly repaired / pulled.

In some cases, the bike owner pays attention to a deformed rear derailleur (the front derailleur rarely suffers on impact). it can also be returned to its original position using the hands. But if the rear derailleur is deformed too much, then it is advisable to replace it.

Note: After performing specific manipulations to repair bent / deformed parts, you should not use the bike for too long. this may end in a fall, another breakdown at the most inopportune moments. And in some cases, such carelessness can lead to a road accident.!

How to properly adjust the rear derailleur

To independently adjust the rear derailleur on a bicycle, you just need to strictly follow the step-by-step instructions from experts in this process. So, follow all the steps:

  • Move the chain to the small sprocket with the right shifter.
  • Unscrew the fixing screw and release the cable.
  • Find the screw with the “H” mark. Use a screwdriver to adjust this screw so that the smallest star lies in the same plane with the rollers, which are located in the foot (frame).
  • Pull the cable by hand and fix it with the screw.
  • Check the operation of the switch, and if it does not work correctly, the chain does not switch well to large stars, then you need to tighten the cable harder (either with the help of a drum or with a switch).
  • Move the chain to the largest sprocket available in the cassette.
  • Find the screw marked “L” and adjust it so that the tab (frame) and the sprocket are in the same plane. in this case, the crossover will not be able to get into the spokes of the front wheel.
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How to adjust the front derailleur

There are also clear and simple step-by-step instructions for adjusting the front derailleur:

  • Move the chain to a smaller star.
  • Unscrew the fixing screw and release the cable.
  • We find a screw marked “L”, with its help we adjust the position of the frame so that the chain is between the plates of the frame, but at the same time does not touch them.
  • We stretch the cable, fix it with a screw.
  • Now we move the chain in the cassette to a smaller sprocket. it is convenient to do this using the rear derailleur.
  • With the front derailleur, move the chain to the middle sprocket and look. if the chain on the second one touches the outer side of the frame everywhere, then you need to increase the tension of the cable using the drum located on the left shifter.
  • We switch the gear to the largest sprocket in the cassette and check. if the chain touches the walls of the frame, you need to move the last element so that the chain is in the middle. This manipulation can be done using the screw marked “H”.

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.

Installing the speed switch on the bike

Any human invention is not eternal. This criterion also applies to a bicycle. But, if any element is broken, then it can be repaired or replaced. This article will discuss how to install speed shifters on a sporty bike. over, the review will concern not only the installation, but also the process of adjustment and tuning.

There are many reasons why such a part requires replacement or increased attention. It can be a breakage caused by a fall, a stretched cable, poor functionality of the entire device. In order not to take the bike to the workshop and not to spend extra money, we provide the necessary action algorithms related to the problems described above. It is possible to solve such a question at home. It takes a little patience and careful study of the instructions provided.

The main design features of the front crossover with the principle of operation

In order to answer the question about the installation of speed switches, you first need to describe their design features.

Let’s start our analysis with the structure of the front version of this product.

  • What is a clamp for? With its help, this object is fixed on the bike.
  • Parallelogram. Element, in the form of a spring-loaded part with hinges. Geometrically reminiscent of a parallelogram. This is the basis for the front swap movement.
  • Guide frame. Consists of two parts. Internal and external. The chain moves along the inside.
  • Adjustment bolts. Presented as two limiters. Their task is to prevent the movement of the frame in the direction of the main frame or in the opposite direction.
  • Bolt for fixing the cable. Its purpose is to provide a reliable fixation of the cable, which serves to organize gear shifting.

Front derailleur setting.

We briefly reviewed the design. Now we will describe the principle of operation of the product. As with any sports bike. the main task is to simply direct the chain to the selected sprocket.

Consider the process of switching from a larger star to a smaller one. This action weakens the cable tension and the spring begins to pull the parallelogram together with the direction frame a short distance to the frame. In this case, the outer part of the frame provides pressure on the chain, which leads to its jumping to the desired sprocket.

If you need to jump to a large star from a small one, then the whole mechanism occurs in the reverse order.

mount, rear, derailleur, bicycle

The parallelogram, when reaching the extreme points, rests against the limiters, which do not allow the chain to jump onto the carriage.

Adjustment process and front derailleur settings

Before adjusting or installing the front derailleur, it is imperative to carry out a preliminary step. Without it, the adjustment and setting of this switch will be impossible.

What we do at the initial stage.

  • We carry out a check for compliance of the throw under the sprocket system. It often happens that the acquired mechanism does not correspond to the stars of this particular model in its technical parameters. No tweak will help here. You only need a transfer from the original manufacturer.
  • Checking for existing backlash is mandatory. In previous falls or collisions, the frame and parallelogram have formed backlashes. The transmission will immediately become fuzzy and the setup will be problematic. Visually assess the condition and eliminate defects if possible.
  • All elements of the switch must be cleaned of adhering dirt. It will definitely not give the opportunity to correctly tune the transmission. After that, lubricate the entire product.
  • The next step in the preparation process will be the cable. We assess its condition after the dismantling process. If gaps are present, urgently need to be replaced. Otherwise, we clean the dirt and lubricate it. It is not necessary to put it back in its place. This will happen during the setup process.
  • We focus on cleaning and lubricating the chain itself.
  • We recommend that by this time already have a configured rear derailleur. This will make it easier to adjust the front mechanism.

After all the preliminary measures, you can start setting and adjusting the front derailleur. If the matter is much more difficult, then we begin to mount the new switch purchased in advance on the bike.

Competent installation of the front derailleur

So how do you set the front view of the derailleur correctly? Consider the algorithm of the necessary actions.

  • We determine the correctness of the position. It must be such that the axis of the direction box is parallel to the chainrings. over, the gap between the outer part of the frame and the largest star did not exceed two millimeters.
  • The distance to the large sprocket is adjusted by moving the crossbar. Bending the parallelogram, we correlate exactly the frame and the largest sprocket, trying to minimize the distance.
  • Sometimes the manufacturer sets the necessary marks on the frame
  • Now we determine the height and the point where the switch clamp will be fixed. We mark the place with a marker. We tighten the bolt.
  • We adjust the axis in relation to the stars by loosening the bolt on the clamp.
  • Rotate the switch with the frame position parallel to the chainrings.
  • We tighten the bolt on the clamp and check the distance of the frame to the largest star and their parallelism.
  • We finally fix the clamp.

Installation is complete, you can proceed to the next stage. setting.

Speed ​​selector setting process

How to properly adjust the front derailleur of a bike?

We will write this instruction in steps with a description of the necessary actions.

  • Set the smallest speed option on the switch. It is better to tighten the cable tension adjustment to the stop
  • At the same time, the rear derailleur is set to the lowest speed. It turns out a chain on large sprockets in both versions.

Setting process

  • The limiters are set in such a mode to bring the frame (inner part) as close as possible to the chain.
  • Now we insert the cable into the place of fixation and tighten it with a bolt.
  • We install the gear on the large sprocket in front and the smallest one behind.
  • The second stop is adjustable to bring the outer part closer to the chain.
  • We set alternately different speed options on both cross-overs. While spinning the pedals, we switch at all speeds. If everything is in order, then you need to go to the road for testing there.

In principle, there is no particular difficulty, only patience and attentiveness to the details of the process.

Causes of functional impairment of the rear derailleur

Moving on to the problem of how to install rear derailleurs on bicycles.

Before adjusting or adjusting the rear option, you need to assess its condition. There are several reasons on the basis of which a malfunction of this device will be detected. In this manual, we will not only describe the possible causes of the problem, but methods for their elimination.

The preliminary stage is over, go directly to the rear derailleur setting.

Adjustment process and settings of the rear derailleur

The preliminary stage is behind, we begin the steps to configure the rear wheel switch.

  • Position. largest star in front, smallest behind.
  • Removes the bolt securing the cable and remove it.
  • Adjust the cable tension by twisting.
  • To prevent the chain from jumping off, set the limiter to the desired mode. The goal is to achieve the correct ratio of the axles along the tensioner roller, the guide element and the smallest sprocket.
  • The cable is pulled by hand and inserted into the prepared groove. We make fixation.
  • Now transmission. We check the clarity of the chain jumping from a large star to a smaller one. The parameters of speed, clarity and silence are important here.
  • We adjust the second stop. The shift rollers and the largest sprocket must be on the same line.
  • The chain tensioner adjusts to achieve a clearance of five millimeters between the guide roller and the largest sprocket.
  • Now we are checking. First at home, pedaling. Then on the street.
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If something does not satisfy the process, repeat again, more carefully.

All described actions require only care, time and a little patience. In any case, performing such actions at home will be much cheaper than servicing. NOT to mention gaining invaluable experience.

How to properly adjust the rear derailleur on a bike?

How to adjust the rear derailleur on a bike is a must-know for every cycling enthusiast. The thing is that the named node of any bike is responsible for shifting gears on the bike while driving. If it fails, normal operation will become impossible.

Rear derailleur device

In order to know and understand the question of how to adjust the rear derailleur on a bicycle, you must first study its device. The main principle of its operation is gear shifting by transferring the bicycle chain from one drive star to another, of a different diameter. over, from a constructive point of view, such switches are quite simple, and their operation is based on the use of brute physical force.

Bicycle rear derailleur

The front shifting system is a conventional steel frame that moves in different directions. During movement, she moves the chain to the side, pushing and removing it from the sprocket on which it is located. Next, the chain moves to a neighboring star.

The rear derailleur of the bicycle has a more complex design compared to the front derailleur, since a specially spring-loaded foot with small sprocket rollers mounted on it is introduced. In the process of shifting gears, such a foot pulls the chain, moving it to the drive sprockets needed by the bike.

When you need to move the chain to a large sprocket, the gear shifting process changes slightly. At the first stage, the chain comes into contact with the nearest large diameter star and rubs against it until it is picked up by the side of the tooth, which will transfer it to a new gear.

Important! To make this process easier and faster, more modern stars have teeth with bevels on the sides.

Bicycle rear derailleur is more complex than front derailleur

Previously used gears did not have such bevels, and therefore it was very difficult to switch. The main reason for the failure of the gearshift is mechanical damage that it can get when the bike falls on the track.

Other reasons for a malfunction of the rear derailleur may be the following:

  • incorrect setting;
  • contamination of both the switch cable and the “shirts” through which it passes;
  • a high degree of wear on the stars, chain, as well as switch rollers;
  • installing a low quality device on a bicycle;
  • malfunction of the shifter (gearshift on the steering wheel).

The immediate cause of the breakdown, as well as the need for adjustment of this bike unit, can only be determined on site. Symptoms of a malfunction may be difficulties in the process of shifting gears, as well as the inability to move.

Symptoms of a malfunction may be difficulties in the process of gear shifting.

Preparatory operations for setting

All the guides written on how to set up the rear derailleur on your bike have tips on how to properly prepare your bike for this first step. The fact is that the speed switch is a rather thin device located in a relatively inaccessible place. Before you begin to regulate it, it will be necessary to eliminate all the reasons that prevent the correct implementation of such a procedure.

Pay special attention to the cleanliness of the bike and its individual structural elements. the cassette with stars and the derailleur itself. You will also need to lubricate your bike chain. Such operations will allow you not to get dirty and clearly see the nodes that you have to adjust.

The next stage of the preparatory work will be the transfer of the bicycle chain so that it stands on the stars of the smallest diameter both in front and in the back. To do this, you will need to find the adjusting screws located on the switch, which are labeled: H (high) and L (low). Their purpose is to adjust high and low range gears. Here you need to unscrew the screw under the letter “L” to the maximum value.

Before you start adjusting your bike, you need to clean and lubricate it.

After the screw is unscrewed, it is necessary to turn the drum until it stops, moving clockwise. This cable tension drum is not installed on all models of modern bicycles. This is worth bearing in mind. A similar drum is usually placed on the shifter. It also turns in a similar way, while you will need to stop without screwing about 4 turns to the stop.

One of the final steps to prepare your bike derailleur is to remove the screw that secures the cable directly to the derailleur. If it is rusty and dirty, then it will have to be replaced. In the case when it is not too worn out, namely, it is not visible that it is unraveling, clean it and lubricate.

It will be necessary to check the ease of sliding of the cable through the “jacket”, which are plastic tubes mounted on the bike frame. The fact is that in most cases the gears change poorly precisely because they are clogged with dirt. To prevent this from happening, “shirts” must be washed.

Rear Derailleur Setting Basics

In the event that you do not have sufficient experience in using a bicycle and do not know how to adjust the rear derailleur on a bicycle, you will need to carefully study the instructions for your bike. Usually it is written in simple and understandable language, and you can figure it out without outside help. If it is difficult for you to understand everything, you can contact the master who has sufficient experience in adjusting this unit.

The very same adjustment procedure must be started by checking that the roller intended for tensioning the chain is located exactly above the small sprocket. If this position is not installed, it must be set using the adjusting screw marked with the letter “H” In order to move the roller to the left, you need to turn the screw clockwise, if you need to turn it to the right. against.

Limiting scheme

Once you’ve made sure the large gears are set correctly, you can begin installing the derailleur cable. To do this, it is necessary to thread it into the mounting screw. Further work is to tighten it harder with one hand, with the other tighten the screw itself, acting on the hexagon. If you are new to cycling and do not know how to adjust the rear derailleur on your bike, remember that the retaining screw must not be tightened to the maximum torque.

After the cable is installed, it is necessary to adjust the small gears. For this purpose, the chain is transferred to the rear sprocket of the largest diameter. After that, check if the tensioner roller is above the large sprocket, setting it in this position using the screw under the letter “L”. It is configured in the same way as above.

If your derailleur has the ability to adjust the chain tension level, adjust it. After you finish adjusting the derailleur, try changing gears on your bike while moving. They should change quickly and easily. If you feel some difficulties, then adjust the device additionally using the cable tension drum.

Bicycle Rear Derailleur Setting

It will be best if you choose the optimal settings for yourself and remember them. In the future, you can set them, already knowing which position of the adjusting screws or the drum is optimal for you. This will make cycling easier and will greatly extend the life of your bike.

Correct gear shifting

Now that you’ve figured out how to set up the rear derailleur on your bike, it’s worth investigating the correct gear shifting on your bike. The fact is that if you do not “click” the gear shift knob, but approach the issue of their choice responsibly, you will significantly extend the life of your bike.

Important! The first rule of thumb to change gears on a bike is that you can only do this when the bike is moving.

Choosing the right gear

If you try to change the speed in a stationary position of the vehicle, it can lead to failure of the transmission. Before you start shifting, the pressure on the pedals must be released.

If you need to change gears quickly, try to do so consistently without jumping over them. The fact is that when you miss a few gears, it can break the stars and the derailleur itself. In the same case, when this procedure is carried out sequentially, all units and parts of the transmission will not be damaged.

If you do not know how to adjust the rear derailleur on a bicycle, try not to “throw” the chain between the chainrings when riding uphill, as this will simply knock the derailleur setting. If you decide to switch between the rear wheels in this way, then this does not contradict the requirements of the bicycle operating instructions.

Throw position relative to the chain

It is worth remembering the following rule: if you want to overcome the hill, shift the gear up before starting to climb it. By doing this, you will not only save your strength, but also protect the transmission from damage. The same rule applies when descending from a hill.

Finding the right combination of stars

Experienced cyclists choose the right chainring for a comfortable ride, depending on the particular bike model. The most common combination for urban driving or on an asphalt road is the tandem of the 4th and 8th rear sprocket.

If you are going to go to the country or ride on rough terrain, you will need a combination of the leading star with the followers, starting with the 3rd and ending with the 6th. The same combination is useful if you want to add stress to yourself while driving on the highway.

In this case, riding uphill requires a combination of the small leading sprocket with the 1st to 3rd followers. In this case, the forces transmitted to the pedals by the cyclist will be minimal, but you will have to rotate them more often.

Pick up the gear with the rear derailleur so that there is no heavy load on the legs

Important! In any case, you should always remember that if you choose the wrong combination of drive sprockets, this can lead not only to a distortion of the bicycle chain, but also significantly reduce its service life, as well as lead to damage to the derailleur.

In addition, it is worth remembering one more rule for operating a bicycle equipped with a speed switch: as soon as you hear extraneous sounds while driving, you must immediately stop moving and check the switch for faults. At the same time, you need to be able to distinguish the sounds accompanying the gearshift from the sounds emitted during a breakdown.