How To Properly Install The 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, much more important is the presence of a proprietary rear derailleur, which will be correctly installed and configured.

Something about a switch.

The gearshift mechanism was invented by Tullia Campagnolo in 1950. This discovery created a furor 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 the speed, I throw 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. More than half a century has passed since the invention of the device, during which time many of its varieties have been created.

The length of the frame depends on the number of gears that you can choose: the longer it is, the more speeds are provided by the design of the bike. However, it cannot be said unequivocally that a long frame is better, some people prefer a short frame that is NOT afraid of stones. And here everyone is right in their own way!

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. Moreover, 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, push and remove 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 in comparison with the front derailleur, since a specially spring-loaded foot is introduced with small sprocket-rollers mounted on it. In the process of shifting gears, such a foot pulls the chain, we move it to the drive sprockets necessary for bicycle bikers.

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 closest large-diameter star and rubs into it until it is picked up by the side of the tooth, which will transfer it to a new gear.

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

The bike’s rear derailleur is more complex than the front derailleur

Previously used gears did not have such bevels, and therefore it was very difficult to switch. The main prerequisite for the failure of the gearshift is mechanical damage, which it can receive 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;
  • High degree of wear while, chains, as well as derailleur rollers;
  • Installing a low quality device on a bicycle;
  • Malfunctioning shifter (steering wheel gear selector).

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

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

Rear derailleur

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

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

Reasons for poor gear shifting:

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

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

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

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

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 an 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 particular attention to the cleanliness of the bike and its SEPARATE structural elements. 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.

READ  Replacing The Rear Wheel On A Bike With Speeds

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 behind. 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 a screw under the letter “L” Unscrew to the maximum value.

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

After the screw has been 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, and not screw it all the way around 4 turns.

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

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

Correct gear shifting

Having figured out how to adjust the rear derailleur on a bicycle, it is worthwhile to study the issue of the correct gear shifting on the VELOBIKE. 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 shifting gears on a VELOBIKE 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 will need to be released.

If you need to shift gears quickly, try to do so consistently, rather than jumping over them. The fact is that when you miss a few gears, it can break the views 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 front sprockets when riding uphill, as this will simply knock the derailleur setting off. If you decide to switch between the rear sprockets in this way, then this does NOT contradict the requirements of the bicycle operating instructions.

Chain transfer position

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

How to install a rear derailleur on a bike?

Having clocked many kilometers on a bicycle, I made sure 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.

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 mechanism, and the most expensive ones are composed of composite, carbon and titanium.

Rear Derailleur Setting Basics

In the event that you DO NOT have sufficient experience with 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 any 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. counter.

Limiting scheme

After you are sure that the large gears are set correctly, you can begin to install the derailleur cable. To do this, it is necessary to thread it into the fastening 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 mounting 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 the tensioner roller over the large sprocket, set it in this position with 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 are finished adjusting the derailleur, try shifting 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 significantly extend the life of your bike.

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

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

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

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

A bit of boring theory

The rear derailleur mechanism throws the chain over the cassette stars, allowing you to lower or higher gears (for reference, it was invented by the Italian Tullia 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. Here are steel to carbon fiber. 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 in most cases are made with the introduction of aluminum. The most expensive models can boast not only precision in work, but also titanium, carbon fiber or composite.
  • Frame size. In theory, everything is simple. the longer the frame, the more gears you can choose. However, one cannot say so categorically, since someone will prefer a short frame, and 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.

How to install a rear derailleur on a bike?

Having clocked many kilometers on a bicycle, I made sure 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.

Installation and adjustment

And it puts something more serious on an inexpensive bike, Used only for riding exclusively on asphalt. It’s pointless. But the range switched was important, since the city is replete with hills, mounds and attics.

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 there is such a comment, then you must use the 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 the small star Must be in 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. By no means on a roller, the fastening 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. The event for her 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.

How To Properly Install The Rear Derailleur On A Bike

Now check the operation of the entire mechanism. When pedaling from the rear derailleur side, there should be no pronounced clicking sounds. 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 face 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 installing and adjusting 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 the switches work

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

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

Shimano Mountain Bike Rear Derailleur Adjustment Screws: Technical Minimum

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

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

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

READ  How To Change The Rear Wheel On A Speed Bike

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

Conveyor device and reasons for its functional failures

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

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

How to install a rear derailleur on a bike?

Having clocked many kilometers on a bicycle, I made sure 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.

Rear derailleur setting

Adjusting the rear derailleur is possible only after you have configured the front derailleur. The bike must be secured so that you can freely pedal and change speeds. Alternatively. turned upside down and fixed on the steering wheel.

Turn on the fastest speed (smallest star). Loosen the cable by unscrewing the mount. Move the cable tension grandmother to the middle position, so that you can loosen and tighten the cable. The adjustment of the rear device is carried out, as in the case of the front derailleur, with the High and Low screws. The High screw is set first. It is necessary to find such a position in which the chain will be tuned exactly to the star, and will not slip and bounce on it.

Then shift the gear to low (largest sprocket) and repeat all manipulations with the Low screw. The setting should bring the chain straight over the sprocket. After setting up the rear device, you will need to tighten the roller. Set the front derailleur to the smallest chainring, the rear derailleur to the largest. As you pedal back, watch the roller to see if it hits the cassette. Adjust the roller with the tensioner bolt. After this setting Carry out a test “in the field”. this is in real driving. Try rolling on a flat surface over bumps, downhill. Pay close attention to how the bike behaves. If necessary, adjust the switches by adjusting the granny or screws.

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

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

Installation and adjustment

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

Yes, and puts something more serious on an inexpensive bike, Used only for rides exclusively on asphalt. meaningless. But the range switched was important, since the city is replete with hills, mounds and attics.

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 there is such a comment, then you must use the 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 the small star Must be in 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. By no means on a roller, the fastening 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. The event for her 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. it 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. When pedaling from the rear derailleur side, there should be no pronounced clicking sounds. Switching up and down should be accurate, without skipping 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 face 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 installing and adjusting 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 a derailleur on a shimano bike

Adjusting the chain tensioner

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

The tensioner assembly is debugged as follows:

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