Bicycle gearshift adjustment front

Correct installation of the front derailleur

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

bicycle, gearshift, adjustment, front

ഫ്രണ്ട് ഗിയർ Trouble പരിഹരിക്കാം|how to adjustment front derailiur,gear in malayalam

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

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

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

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

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

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

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

Why can’t I adjust the front derailleur

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

  • Wrong switch or star system.
  • The switch is deformed or out of order.
  • Tight running of the cable in the shirt.
  • The shifter is out of order.
  • The chain is too stretched.
  • Derailleur, cable and chain are heavily soiled.

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

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

Adjusting and adjusting the front derailleur of the bike

After you have made all the preparatory measures, you can proceed to the adjustment and tuning. If you install a new derailleur or remove it during cleaning, then before adjusting it should be positioned relative to the chainrings, and then proceed with the adjustment.

Speed ​​selector setting

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

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

  • We set the lowest speed using the switch on the steering wheel (remember that at this stage the cable should not be attached to the crossover). We twist the adjustment of the tension of the gearshift cable on the shifter until it stops clockwise (if you look at the entrance of the shirt into the shifter) and return it back by 1-2 turns. Many recommend tightening completely, but as practice shows, for further fine tuning, it is better to leave a margin for tension / loosening of the cable in both directions.
  • Set the lowest speed on the rear derailleur (largest sprocket). As a result, you will get the first speed front and rear (the chain should be on these stars).
  • We adjust the limit switch L so that the inside of the frame is as close to the chain as possible, but does not touch it when pedaling. To do this, if you need to move the frame towards the bike frame, you should turn the bolt L counterclockwise, from the frame. clockwise.
  • We insert the cable into the place of fixation on the gear selector and, pulling it (with your hands, do not use pliers), tighten the cable bolt.
  • We switch gears from the front to the largest star, from the back to the smallest (the chain should be on these stars).
  • We adjust the limiter H. It is necessary to achieve such a position of the guide frame in which its outer part is as close as possible to the chain, but does not rub against it when pedaling. To move the frame towards the frame, turn the screw clockwise, in the opposite direction. counterclockwise.
  • We set the 5th speed on the rear cross-over. After that, turning the pedals, we change the speeds with the front switch over the entire range (3. 2. 1. 2. 3) several times. Then set speed 2 to the front and, shifting reverse gears, check that there is no friction between the chain and the frame in positions 2. 2 and 2. 7 (example for 24 speed bicycles). expensive front derailleurs can achieve frictionlessness even at 2-1 and 2-8 (although you should be aware that these are not normal modes and should not be used when driving). If there is friction of the chain against the frame in these positions or unclear gear shifting, then the cable tension should be adjusted by turning the adjustment on the front shift lever. In case of problems when switching from a smaller chainring to a larger one, tighten the cable (turn the adjustment counterclockwise), and when it is impossible to switch from a larger to a smaller one, loosen it (turn the adjustment clockwise). If there are no Комментарии и мнения владельцев on the work, then the next test must be performed under load when driving on roads.
  • We find a flat section of the road (without bumps and slopes) and check the operation of the front crossover while driving. In case of any problems when switching, right on the go, we rotate the adjustment on the shifter in the direction we need.
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If you do not understand something about how to set up the front derailleur, then we advise you to watch a video on this topic.

Design and principle of operation of the front crossover

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

HOW TO SOLVE GEAR CYCLE SHIFTING PROBLEMS I CABLE ADJUSTMENT I LIMIT SCREW ADJUSTMENT

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

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

This design provides limiting bolts (L and H) against which the parallelogram rests when the end positions are reached. If the setting of the front derailleur stops is not correct, the chain will jump off the carriage or connecting rod.

As you may have noticed, setting up and adjusting the front derailleur of a sports bike at home is not such a difficult job. It is enough to do everything methodically and slowly. Failed to set up the first time, please try again. The tricky part of this procedure is correctly fitting the front derailleur to the bike frame, which takes a little dexterity. And so, it doesn’t matter what kind of Shimano or SRAM transfer you have. follow the instructions and you will succeed.

Front derailleur adjustment

The front derailleur is less common than the rear derailleur. Bicycles with this device are cheaper. The front derailleur moves the chain to the stars of the system. Moving from side to side, he pushes the chain to the next star.

  • Switch frame. A chain passes through it, this is the main element when switching speeds. She moves to the sides in front of the leading stars.
  • Parallelogram. the mechanism itself (speed switch). Includes spring.
  • Fastening to the frame.
  • Upper stop L.
  • Lower stop H.
  • Fastening the cable.

The main problem with the front derailleur is that the chain hits the frame when driving. You can fix this problem yourself.

External Shifting on Speed ​​Bike

The outer type belongs to most multi-speed bicycles. It is used on both mountain and city walking models. The mechanism is made up of gear shifters and stars that form a cassette or system. Variable speed with rear and front derailleurs.

This type of gear shifting can be seen on both the Forward Dortmund city bike (7 speeds) and the Forward Agris mountain bike (24 speeds). You can customize this switch yourself by examining the mechanism.

What can affect the quality of the switches

It is important to find out what caused the problem.

Advanced option for setting gear shifting.

Before setting the switches, it is recommended to wash the bike and make sure there is no mechanical damage:

  • shift cable;
  • shift cable sheath;
  • stars;
  • chains;
  • rear derailleur bracket (cock);
  • the switches themselves;
  • shifters.

Design and principle of operation of the front crossover

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

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

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

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This design provides limiting bolts (L and H) against which the parallelogram rests when the end positions are reached. If the setting of the front derailleur stops is not correct, the chain will jump off the carriage or connecting rod.

Deformation of the switch

A common cause of such a breakdown is a blow from a bicycle. Usually the rear derailleur suffers, the front derailleur is very difficult to bend. After a breakdown, it is worth checking which parts are broken.

  • If it is a frame. align or change the part.
  • If the screw that adjusts the chain tension or the eyelet that secures this screw breaks, then it is better to replace the parts. Otherwise, the speeds will switch very badly.

Front Derailleur Adjustment

Basic setup rules

The exact setting of the bike box depends on the set lift height and derailleur angle.

Rear derailleur

The gear selector is an important part of a multi-speed bike. Thanks to this component, it becomes possible to move in extreme conditions, which include upwind movement, ascents, poor road quality. The transmission unit must cope with all these problems. The quality of the ride and the safety of the cyclist depend on the fine-tuned operation of the speed switch. This skill is very useful, and every bike owner should learn how to independently adjust the gear shifter. Every cyclist can make adjustments to the bike’s gear shifters on their own. You need to study the theory in detail by reading the instructions, or using the advice of experienced bike owners.

Before setting the derailleur, the rear derailleur must be adjusted. Placing the bike in the correct position (wheels up) will greatly facilitate the entire adjustment process. So, all the necessary details will be in plain 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 out cable with elements of damage. Such a part requires replacement;
  • damage to the cock.

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

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

  • The handle for shifting the speeds, 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 stars of different sizes;
  • front fixing mount;
  • rear derailleur, whose main function is to transfer the chain to the necessary sprockets.

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 the 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 end.

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 hold the frame with the other hand. Slowly pull out the problematic transmission element (rooster) until relatively even setting.

Note: such 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 with the help of 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, do not use the bike for too long. this may end up falling, another breakdown at the most inopportune moments. And in some cases, such carelessness can lead to a traffic accident.!

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 the cable is loosened, it is not thrown onto small sprockets. As mentioned above, you can start setting up your bike from the rear derailleur. Procedure for adjusting the rear derailleur:

  • 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 is abbreviated as H, and on the other. L. These two bolts are used to adjust the high and low gears on the sprockets. If during the adjustment process any extraneous sounds occur, you can get rid of them with the help of the latch;
  • check the tension of the cable and if the tension does not correspond to the required one, use the regulator located on the shifter;
  • Test the switching quality. If the switching occurs smoothly, no extraneous sounds are heard, then you did everything right.
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How to adjust the speed switch on a bike

Having become the happy owner of a bike, you should be prepared for the fact that over time you will have to carry out basic maintenance of the bike yourself. Of course, if we are talking about a serious malfunction, it is best to seek help from specialists, but many manipulations can be safely performed on your own.

Why bike speeds don’t shift well

Usually, the thought of needing to fix derailleur problems comes when the chain is shifting too hard between the sprockets, or the gears are not shifting at all. The problem comes suddenly, as an option, you can contact the master.

However, this issue can be resolved in the service in a couple of minutes, and the money will have to be paid in an hour. Maybe you should tinker yourself?

Before proceeding with the instructions for setting up the bike speed system, let’s determine why it does not work correctly:

  • Switches are damaged. A complete replacement is needed to solve the problem.
  • Deformed cock. protection of the rear derailleur. Usually it is advised to change, but once you can straighten.
  • Spring worn or stretched cable. Replacement required, switch setting.

Very often, all the components of the transmission are in good condition, and the gears are still poorly shifted. New parts, or small workpieces installed in a transmission unit are a common cause of poor chain sprocket running.

Adjusting the front derailleur

  • We put the speed switch in the following ratio: the smallest star in the front and the largest in the back;
  • We unscrew the cable;
  • Using the screw of the limiter for low gears, we adjust the position of the frame, it should be at a distance of no more than 3 millimeters from the chain;
  • Stretch the front derailleur cable slightly;
  • Switch the speed to the middle sprocket and check if the chain is touching the outer frame. If it touches, it is necessary to tighten the cable more;
  • We put the derailleur on the smallest sprocket and check how easy it is to change gears. If the switch does not work, adjust the high gear limiter screw.

Setting switches at home

Now let’s figure out how to set up the speed system ourselves. Derailleurs on bicycles with multi-gear transmission are divided into front and rear. The latter are most vulnerable when riding in a variety of road conditions, the risk of damage is higher compared to the front ones, but the adjustment must be done at the very beginning. Obviously, the rear derailleur serves more stars, so it takes longer to set up.

Attention! If there is damage, and the tensioner is not parallel to the frame and cassette, then it will not be possible to correctly adjust the system!

First you need screws L and H. they are clearly visible, no need to look. Also includes a cable adjuster, tension and fixing screws.

  • H is used to align the roller with the small rear sprocket. By tightening the screw L, we set the roller on one straight line with the large rear sprocket.
  • Set the highest speed on the shifter.
  • Tension and fix the cable with the fixing bolt.
  • Large gears should be included without interference, otherwise, using the adjuster, the cable is slightly weakened. Additional tension will be needed if gears are poorly reset.

Actually, the adjustment itself is made, it remains to adjust the switching accuracy. This is especially true for systems with a large number of stars. To do this, the chain is installed on a large chainring at the back and a small one at the front. By tightening the tension screw, we achieve the optimal position of the roller. as close as possible to the cassette. The same must be done and vice versa: set the chain to the maximum sprocket in the front and the minimum sprocket at the back. The roller should not rub against the cassette, just be located next to it.

How to properly set up the switch in front:

  • Check device attachment.
  • At minimum speed, release the cable tension.
  • Use screw L to create a gap between the derailleur body and the chain (1 mm).
  • Secure the cable with the adjusting bolt.

The same should be done with the H-screw. The maximum speed must be set, and the gap with the chain must not exceed one millimeter.

Adjust the speeds on both derailleurs until the chain is free to swing from one chainring to the other. If it is difficult to walk, it is necessary to adjust the correct position of the cable using the adjusting bolt.

After all the manipulations, the entire system is checked. To do this, you need to ride a bike and try all the recommended gear ratios. Note that on mountain bikes, the transmission adjustment is a common periodic procedure, and if suddenly the transmission goes tight, we are not in a hurry to draw conclusions about the breakdown, but we do what is described above.

Do not think that a high-quality transmission does not need to adjust the shifting system. Yes, it may be necessary to do this less often for shimano components, but sooner or later you will still have to face.

We just saw an easy way to adjust the front and rear derailleurs. Is it really necessary? Adjustment of the shift mechanism is necessary for the transmission, like tires for a wheel. Timely assistance to the traffic node will not only solve current problems, but also prevent them in the future. Eliminate all inconveniences in time and ride with pleasure!