How to make a derailleur on a bike

Reasons for the malfunction of the rear spreader

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

How to adjust the rear derailleur on a bike

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

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

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

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

This should be done as follows:

  • put the switch on the highest speed (that is, on the smallest star)
  • we find two screws. H and L. Turn the screw H so that the roller on the switch moves one mark with a smaller star
  • put on the lowest speed (large sprocket), and rotate screw L until the roller is aligned with the large sprocket
  • again set to the highest speed, and pull the cable. In this case, you need to make sure that he got into the special prem. It should be pulled tighter!
  • check switching! If it switches very tightly, or does not switch at all, then you need to loosen the cable a little, or, on the contrary, pull it.
  • if everything works well, then we can assume that the job is done.
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Chains and sprockets

These two parts are the main parts of the bike, since they are used to directly move. Most often, the stars are a cassette, which consists of 6-7 stars. It all depends on the number of speeds on the bike.

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

Cables and shirts

Special attention should also be paid to cables with shirts. The shirt is the sheath of the cable. And special attention should be paid to them for the simple reason that if the cable or shirt is damaged, then at the most crucial moment it can break, and subsequently switching speeds will be impossible.

Therefore, they must be chosen very carefully so that there is no damage or traces of rust, and for each cable there is a different type of shirt. There are only three of them. a SIS braid, a SIS-SP braid and a twisted braid. Based on the selected cable, the correct shirt should also be selected. Otherwise, it may happen that the cable will rub the entire sheath, and it will fail.

how to adjust the rear derailleur. start from the extreme positions

After troubleshooting, we need to adjust the rear derailleur. The minimum and maximum travel is adjusted using one of the two screws. These are Phillips screws and can be seen on the switch housing. The screws are located next to each other, about a centimeter and a half. Also, next to them you can often find the letters “H” and “L”. They show which screw is responsible for the top and which for the bottom position.

After adjusting the position of the roller over the small star, move on to the large one. To customize the rear derailleur, you just need to press it with your hand or finger. And bring to the big star.

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Cables and shirts

The cables for the front derailleur differ from the derailleur on the rear in that they can be slightly shorter, or even slightly thinner. And shirts are also divided into three types, and each shirt has its own cable.

Causes of failure of the rear derailleur on a bicycle

Before you start adjusting the rear derailleur on your bike, you need to see if it might also be worth adjusting the front derailleur, and also identify the source of the problem:

  • damage to the cable or lack of lubrication on it;
  • deformation of the rear spreader fastener. rooster;
  • development of a chain or sprocket system on the rear wheel;
  • wedge of chain tension rollers;
  • malfunctions in the shifter responsible for changing speeds on the steering device.

How to fine-tune the rear derailleur

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

How to adjust the rear derailleur on a bike

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

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

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

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

This should be done as follows:

  • put the switch on the highest speed (that is, on the smallest star)
  • we find two screws. H and L. Turn the screw H so that the roller on the switch moves one mark with a smaller star
  • put on the lowest speed (large sprocket), and rotate screw L until the roller is aligned with the large sprocket
  • again set to the highest speed, and pull the cable. In this case, you need to make sure that he got into the special prem. It should be pulled tighter!
  • check switching! If it switches very tightly, or does not switch at all, then you need to loosen the cable a little, or, on the contrary, pull it.
  • if everything works well, then we can assume that the job is done.
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How to adjust the front derailleur on a bike

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

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

Customization

Adjusting the bike‘s rear derailleur begins after you lift the rear wheel into the air using stands or mounts before adjusting the rear derailleur. Instructions for setting up the mechanism:

How To Install A Rear Derailleur | Mountain Bike Maintenance

Rear derailleur cock

The rooster (or cockerel) is the part with which the switch is attached to the frame. In addition, it provides more reliable protection of the frame from all-round impacts, such as a fall from a great height or a large overload of the bicycle. First of all, the rooster fails, and this saves the frame itself. After all, the rooster can always be changed, but the frame, if damaged, may not be repairable.

Therefore, this part is also very necessary, and if there is a need to purchase it, then choosing it, you should pay attention to the following characteristics: its alloy composition (what metals were used in the manufacture), quality (no chips and cracks) and of course the price.

It should not cost more than 500-600 rubles, of course it all depends on the wishes of the buyer. You can also purchase those that are much more expensive, but this is unnecessary.

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How To Replace And Install A Rear Bicycle Derailleur