Does not shift the chainring on a bike


The X-Dome design includes various types of stars:

  • Average. They are made of special steel, molybdenum and chromium are also added. Thanks to this, the working resource of the system is significantly increased. Connected into one structure.
  • Extreme. They are made from aluminum only. Installed on a drum.

The X-Dome is a very expensive system. Many people cannot afford it. The benefits of the X-Dome include:

  • light weight;
  • strength;
  • quality materials are used for manufacturing;
  • versatility.

How to Front Derailleur Troubleshooting and diagnosing

On blocks (multiple spiders)

The main difference between this type of attachment is the presence of several spiders. Mounting on blocks includes several stars (2-3 pieces). They are attached to the drum. Block mount developed by Shimano.

The advantages of block mounting include:

  • If necessary, you can replace a worn-out group of structural elements. This does not require changing the cassette.
  • You can easily pick up a new block.
  • High reliability.

Front stars. leading

The chainrings are part of the vehicle’s drivetrain. Their number is 1-3. They represent a disk that is installed on the carriage. Each disc has a certain number of teeth.

The chain is mounted on the teeth. This part of the transmission is used to transmit torque as well as shifting gears. If necessary, the cyclist can increase or decrease the torque.

does, shift, chainring, bike

Spare parts are divided into two types:

  • Fixed.
  • Removable. If necessary, such stars can be removed.

Rear stars. driven

The rear sprockets represent the driven part of the transmission. They are designed for gear shifting. Their number depends on the type of vehicle and driving style. This part of the transmission allows you to pedal comfortably in different conditions.

The stars gather in one node. The quantity varies from 7 to 11 pieces. They are made from different materials (titanium, steel, aluminum). Expensive models are nickel-plated and also chrome-plated.

The number of teeth varies from 11 to 36 pieces.

  • Road bikes (11-27).
  • Mountain bikes (14-36).

Features and differences of an oval star from a round one

Oval stars were invented at the end of the 19th century. Nowadays, they are not very popular among ordinary cyclists. There is a small percentage of professional cyclists who use bicycles with an oval drivetrain.

Several companies are engaged in the production of such products.

What are the differences between an oval star and a round one:

  • Improvements to the quality of movement.
  • expensive materials are used for the manufacture of parts.
  • Uniform effort on the legs.
  • The maximum constriction is 30%.
  • Variable radius.

Stars on a bike. description, quantity

The chainring is part of the bike’s drivetrain. The front ones belong to the leading part of the transmission. And the rear ones are the driven part of the transmission. Thanks to these structural elements, rotation is transmitted from the pedals to the rear wheel.

Without these structural elements, the bike will not run, because the force will not be transmitted to the rear wheel. This simple part is truly an indispensable part of a transmission.

There are two types of bicycles:

Models with a multistep transmission are equipped with two systems:

  • Rear sprocket system (driven). Amount 7-11.
  • Chainring system (leading). Quantity 2-3.

The driven system consists of a cassette and a ratchet. Single speed bikes come standard with:

  • one presenter;
  • one slave.

By purpose, bicycles are divided into several categories (hybrid, city, road, mountain, etc.). The number of stars for each category is determined individually.

  • On mountain bikes there are usually 3 leading.
  • On road bikes, 2 leading.
  • Bicycles for extreme sports are often equipped with one leader.

What determines the durability of transmission parts:

  • quality of repair and maintenance;
  • driving style;
  • quality of materials.

These structural elements are made of what materials:

  • Titanium. Titanium is used to make the most expensive items. Characterized by high strength and light weight.
  • Aluminum. Products made from such material are several times cheaper than titanium ones. Its characteristic feature is its low weight. By using these parts, the cyclist can lighten the bike‘s weight as much as possible. Aluminum products are very popular among professional cyclists.
  • Steel. Ideal value for money. It is a durable and reliable material.
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When choosing, it is necessary to take into account the following factors:

  • Material.
  • Mounting method.
  • Diameter.
  • Number of Teeth (18-52).
  • Appointment.

Bicycle sprockets: front and rear

Almost every inhabitant of the planet is familiar with a bicycle today. It is an environmentally friendly form of transport that promotes health. Every cyclist should have a minimum of knowledge, which is simply necessary for repairing a bike.

The chainring is one of the most important parts of a bike. They are designed for gear shifting and torque transmission and are the main structural element of the cassette.

Service and repair of sprockets

Parts made of titanium have a long service life. They are durable and lightweight, rarely wear out. The main disadvantage is the high price, which is why many cyclists prefer aluminum counterparts.

Front derailleur not shifting to big ring

Aluminum structural elements wear out quickly. The main advantage is the democratic cost. Worn aluminum parts are not rebuilt because they are of low cost. In this case, replace parts.

Front Derailleur. Advanced Troubleshooting

Structural elements made of steel are very popular. They are installed on inexpensive city and road bikes. Steel is a durable material. Therefore, the resource of such parts is enough for many seasons. If necessary, replace the ball bearings of the cassette.

It is necessary to periodically clean and lubricate the bike transmission. This will extend the life of the equipment.

How to properly clean your bike drivetrain:

  • Remove the rear wheel and brake caliper first.
  • If you find dirt, then you need to disassemble the cassette. If there is no dirt, then you need to clean the wheel.
  • Using a special brush, you need to get into different gaps.
  • After that, you need to clean the cloves. You can also use a brush for this.
  • After completing the cleaning process, it is necessary to wipe the surface with a special substance. For example, you can use kerosene.
  • Wait for the substance to dry (2-3 hours).
  • After that, a special lubricant must be applied to the pits and teeth.


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Setting switches at home

Now let’s figure out how to set up the high-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!

does, shift, chainring, bike

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. For this, the chain is mounted on a large chainring at the back and a small chainring 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 chainring in front and minimum. at the back. The roller should not rub against the cassette, just be located next to it.

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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.

does, shift, chainring, bike

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 allow not only to solve current problems, but also to prevent them in the future. Eliminate all inconveniences in time and ride with pleasure!

Setting up bike derailleurs (beginner’s guide)

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

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

Bicycle Rear Derailleur Setting

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

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

Switching the rear derailleur to the smallest star

Unscrew the rear derailleur cable clamp screw and loosen the cable

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

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

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

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

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

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

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

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

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

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

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

Unscrew the front derailleur cable

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

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

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

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

The bike derailleur setup is complete and you can now sit down with pride and enjoy riding your iron horse. There are tons of setup videos, the best of all is at this link:

Ride with pleasure!

Internal switching mechanism

This type of derailleur uses planetary bushings. In this case, the shifting mechanism is hidden inside the rear hub, which results in one sprocket on the front wheel, a chain, and one sprocket on the rear wheel.

The current planetary hubs have a different number of gears (from three to fourteen), they can also have a built-in brake.

Such mechanisms are mainly used on walking and road bicycles, very rarely on mountain bikes.

Consider the merits of these switches:

  • increased resistance to weather and road conditions (the parts of the mechanism are in the case);
  • the presence of a built-in brake;
  • they are quite reliable and durable;
  • such a mechanism allows you to change gears without pedaling;
  • fairly simple maintenance.

However, such mechanisms also have disadvantages:

  • quite heavy weight;
  • complication of movement may occur due to strong friction of the nodes;
  • it is impossible to repair the mechanism in field conditions.