Bike When Shifting Gears, Chain Fails

Why does the chain fly off on a high-speed bike. What to do if the chain comes off on a speed bike

A bicycle is a unique means of transportation. It does not pollute the environment, has a positive effect on the health of its owner, and allows you to experience physical activity in the fresh air. A bicycle is the first vehicle that a person gets in his life and for many it remains a favorite means of transportation for life. The most common problem faced by every cycling enthusiast is the chain flying off the bike. For what reasons this happens and what needs to be done to fix this problem, we will try to figure it out in this article.

Speed ​​bike problem

For a regular bike, this problem is easy to solve, but what to do if the chain jumps off on a speed bike? Among the most common causes of this problem are the following:

  • deformation of one of the stars. Gear shifting on multi-speed bicycles is carried out using cassettes consisting of several stars. These designs are collapsible and non-collapsible. Replacement of a damaged star is possible only in collapsible structures, if the structure is non-collapsible, its complete replacement is required.
  • Mistakes in the setting of the derailleur can cause the chain to fly off the bike when shifting gears. Gear shifting should be fine-tuned. If the bike owner himself cannot do this, you need to contact a specialist, or carefully study the instructions for setting the bike speed switch. The safety of the cyclist depends on the quality of this function.
  • Stretching the bike chain. This process is associated with long-term use of the chain, the application of high dynamic loads to it, irregular cleaning, due to which the residues of lubricants, mixed with dirt and dust, accumulate on the chain links. In this case, the chain must be shortened or replaced. To shorten the chain, you need to remove several links from it. This is done using a special squeeze tool. This simple tool is a must-have for every cyclist. With its help, the axle of the link (pin) in the lockless type bicycle chain is pushed out. If there is noticeable stretch on the bike chain, and the service life is long, it will be more advisable to replace it completely. To keep the chain in good condition, it must be periodically rinsed in kerosene and cleaned.
  • The curvature of individual chain links as a result of which the chain flies off the bike.

Loose chain tension on bicycles without gears

To eliminate the problem that has arisen, you need to understand why it has arisen and tighten the chain. This is done using special wrenches that every cyclist should have with them.

It is much easier to tighten the chain on a regular bike, in the case of a speed bike it will be more difficult. For successful repair work, when the chain falls off the bike without speeds, you need:

  • turn the bike upside down.
  • If the rear wheel is attached with an eccentric, then you need to loosen it a little, or not completely unscrew the nuts.
  • Adjust the desired chain slack.
  • Tighten nuts.
  • Check chain tension and quality of work.

Rear wheel deformation

Perhaps the problem is the deformation of the rear wheel. One of the most unpleasant cyclists’ problem is the so-called “eight”. “Eight” is the deformation of the wheel, violation of its shape and the inability to perform functions. This problem is eliminated by tightening and loosening the spokes with a special spoke wrench. To do this, the wheel is removed, the affected area is determined and the central spoke of the “figure of eight” is highlighted. Then the needles are pulled through one.

How to increase the tightness of the bike chain

The case with high-speed bicycles is much more complicated. How to chain a bike at speeds?

The transmission unit for bicycles with speeds, of which the bicycle chain is an element, consists of cassettes with several stars. Therefore, the repair work to eliminate chain slippage and sagging on such bicycles has its own nuances. To understand the causes of the problem, you must:

  • If the chain constantly flies on a high-speed bike, it is worth checking if the sprockets are not damaged. If one of the stars in the cassette unit is deformed, the chain can be thrown over another star to continue moving. But in this case, you need to understand that you cannot switch the speed. This method is suitable in order to get home for better repairs. To eliminate the damage, the deformed star will have to be replaced, and if the assembly is not collapsible and the entire cassette is malfunctioning, then it must be replaced.
  • the chain flies on a high-speed bike the reason is a failure to set the speeds. Check the quality of the setting. Very often, a failure in the speed setting will cause the chain to hit. The setting is made according to a special scheme.
  • After eliminating the root cause, the chain must be put back in place.

To properly fit the chain on a speed bike, you need to disconnect it using a squeeze. If you take a new chain, then you need to measure the required length, for which the chain is thrown over the large stars of the cassette blocks and connected, measuring the required distance. The excess piece of the chain is removed using a special squeeze tool. By turning the screw, the link axis is displaced and the unnecessary chain section is removed. Then the chain is passed between the speed switches and connected using the same tool.

If the chain flies on a children’s bike, then, depending on the design, the same actions are performed as with an adult bicycle.

A malfunction of the transmission unit on a high-speed bike can threaten the health and life of its owner, the cyclist can fly out of the saddle by inertia, so you need to remember to carry out preventive maintenance work on the chain, check the condition of the speed switch and the integrity of the main parts. It is especially important to carry out a technical inspection of your vehicle before starting the movement, in the event that you make long cycling and crossings. Timely diagnostics of your bike is a guarantee of safety.

How to put a loose chain on a bicycle

Not long ago, a child’s chain fell off while riding a single-speed bicycle. On a bike like this, this is a serious problem. Neither drive forward nor brake. It’s still good if the wheel doesn’t jam.

This is why an additional front V-brake is required on single speed bikes. At the very least, it will always help you brake in an emergency with a bicycle chain.

I told him on the phone how to put it back. It seems to have happened, I came home, they started to figure it out and eliminated the very reason that led to this. I decided to describe everything, since this problem often arises, and sometimes it has to be solved in the field.

First of all, you need to understand: why it flies.

Reasons why the chain flies off the stars on a bicycle:

  • Weak tension.

Most common cause related to single and multi-speed bikes.

How to check the tension of the bike chain? Its sag on a single-speed bike should be 10-15mm maximum in the center between the sprockets.

details about this are described in the article “How to correctly determine the length and tension of a bicycle chain” and here we will not repeat ourselves.

Curvature of one or more chain links. Usually one link is enough. It occurs from impacts due to rough handling or falls of cyclists.

Single-speed cycling is more robust and such problems are extremely rare there. In more gentle multi-speed ones, this happens, but it cannot be said that very often. There is no way to treat it. It is necessary to either remove or change the link, if the length of the chain allows, or replace it all. If the chain is already partially worn out, it is better to immediately change it to a new one.

Aligning the link with a hammer on an anvil or pliers is unrealistic. It is ideal not to align it directly, but in this form it will still accelerate the wear of the sprockets and fly off them

Deformation or wear of the sprocket teeth in the system or cassette.

Deformation can only occur from impacts, and wear, especially on bikes with gear shifting, is a natural and inevitable process.

In both cases, it is better to change the sprockets, and if they are not the newest ones, there is a reason to replace the entire cassette at once.

I would like to clarify one more thing. To insert into place the curved teeth of the sprockets “with the help of a hammer and some kind of mother” is, at first glance, a simple and obvious business, but not rewarding and often useless. Although the craftsmen do everything, but then you will ride such a bike, so think for yourself. Ideally, it will not work out exactly: this means that the wear rate of the chain will increase, and the risk of dropping it from the sprockets will remain.

The chain is very stretched.

This is very rare on single-speed bicycles, but common on multi-speed bikes. How to correctly determine chain wear is described here and we will not repeat ourselves either.

Front or rear derailleur incorrectly configured.

This only happens on bicycles with gear shifting. The problem manifests itself when, when pedaling, the cycle itself jumps to another chainring. In this case, you need to set the switches correctly. This is usually done with two adjusting bolts, designated by the letters L and H. But we will not consider all the nuances of this process in this article, especially since there are many materials and videos on this issue on the network.

Now how to put the chain that has flown off on a single-speed bicycle into place.

The idea is this: First, it is completely put on one of the stars (usually on the back, but you can also on the front) and thrown over the second sprocket (front or, respectively, back) to lie on the part of the teeth. Further, when scrolling the pedals in the direction of travel, the chain is captured by the remaining teeth of the sprocket and completely lies on the entire sprocket and is thus put on.

The algorithm of actions when putting on the chain is approximately as follows.

  • Turn the bike upside down, placing it on the saddle and handlebars, or lift it up so that the rear wheel rotates freely.
  • If the bike has a bicycle chain guard, it is better to remove it. This will make it easier and more comfortable to reach the chainring. If you are too lazy to shoot, or you can already reach the asterisk. well, it’s your business.
  • Place the chain completely over the rear sprocket. (If you have not removed the protection, then it may be more convenient to completely put it on the front sprocket).
  • Place the chain over the chainring in the direction of rotation and pedal forward in the direction of travel. When the pedals are rotated, it itself is thrown over the remaining teeth.

Here you need to understand that if the bike is upside down, then the chain is thrown onto the lower part of the sprocket (in relation to you) and, scrolling the sprocket itself by the pedal clockwise, we throw it on the front sprocket entirely. If you start to throw the chain over the top of the sprocket in relation to you, you will not be able to pedal. in fact, you will have to press the brake.

If the bike is in the normal position (wheels down), then again throw the chain on top of the sprocket and pedal clockwise. as if you were driving forward.

Everyone is wearing a chain.

How to increase the tightness of the bike chain on a single speed bike

So that the chain does not fly off the next time due to sagging, it is better to immediately increase its tension.

To do this: Loosen the nuts on the dropouts slightly so that the rear wheel moves a little and pull it back. With the correct bike chain tension set, slowly tighten the nuts. Just do not skew the rear wheel and check that it rotates strictly in the vertical plane and does not touch the frame and wing feathers.

You don’t need to pull the bike too tight, the pedals will spin tight. There should be a slight slack, but a maximum of 1-1.5 cm.

If the rear wheel has nowhere else to move. remove one link.

What to do if the bike chain falls off?

During the operation of the bicycle, the owner has to deal with a situation where the chain comes off during the ride. This situation is dangerous when driving at high speed, as well as in the process of screwing down a hill. Even if you use slip-on pedals with shoes to keep your foot from flying off the pedal, when the chain falls off, the cyclist can sprint over the handlebars or fall on his side. In this article, we will look at the main reasons why the bicycle chain flies, and also give practical advice on how to fix this breakdown.

The reasons

There are a number of reasons why the chain fails. They are listed below:

  • weak tension (applies to both bicycles without gears and with variable transmission);
  • curvature of one or more links;
  • deformation of one or more teeth in the chainring or chainring;
  • the chain is stretched as a result of prolonged use;
  • incorrectly configured front or rear derailleur.
READ  How the rear wheel of a speed bike works

Now let’s take a closer look at each problem. Here we will also offer solutions to emerging difficulties.

Weak tension

If your chain goes off on a bike without gears, all you need to do is unscrew the two nuts on the rear wheel axle and then pull it towards you. Tighten the nuts, but make sure that the wheel does not move closer to the center of the frame. By following these steps, you will see that the chain will not sag. Accordingly, the likelihood that it flies again is completely excluded. But in the case of this problem, on a high-speed bike you will have to sweat. A special spring is installed in the gear selector, which automatically pulls the chain. With prolonged use, it loses its elasticity, which leads to similar problems. Since the transmission is not separable, you will have to change the switch to a new one.

Curvature of one or more links

Such a problem can be encountered quite rarely, but it can still bother you at any time. If you notice that the links are curved, you have two options. The first is to completely replace the chain. The second is to get rid of the bent links using a special squeeze. Do not use this method on bicycles without variable transmission. It is recommended to use this method as a temporary solution on models with gear derailleurs.

Deformation of one or more teeth in the chainring or chainring

Why can teeth warp? The first obvious reason is due to impact, the second is due to severe wear. In any case, if the chain falls off solely due to problems with the cassette teeth, then it must be replaced with another one.

The chain is stretched due to prolonged use

This happens in the process of wear and tear. The switch spring cannot tension it normally, it constantly sags. In this case, there is only one way out. to replace the circuit with a new one. In practice, it is rare to find bicycles in which the chain is stretched and skips when shifting gears. It is virtually impossible to restore its elasticity.

Front or rear derailleur incorrectly configured

This only happens on bicycles with gears. All you have to do is adjust the rear derailleur as precisely as possible. The problem is quite simple to notice: the chain can randomly jump to another gear in the process of turning the pedals with great force, but you will not press on the shifter petal. There are two bolts on the switch housing, with which you need to adjust the travel limit of the mechanism.

If you see that your chain flies, it does not always mean that you need to change it entirely. It is possible that the problem lies elsewhere. If you do not want it to fly off at the most inopportune moment, we recommend that you carry out maintenance from time to time. Check the transmission very carefully for wear. A simple check before driving will help you avoid serious injury, especially if you prefer to ride in an aggressive or even extreme style. We hope that the tips above will help you avoid future breakdowns.

Why chain slips on a speed bike: 2 reasons and a recipe for treatment

Statements like “I’ve been rolling for the third year, with no maintenance, and everything is fine” ultimately lead to serious problems. Chain slip during power pedaling is one of them. This fact happens more often from ignorance: what and when needs to be changed. Less often, actions that contradict instructions for setting up individual components lead to interruptions in the smoothness of the chain.

Why Mountain Bike Chain Can Slip Under Load

There are, in fact, only two reasons. The rear derailleur is incorrectly adjusted or the chain and sprockets of the system and / or cassettes are worn out.

Upset rear derailleur

Why does a chain on a bicycle skip at all under load? It either jumps over the stars due to insufficient frictional force, or it got between the sprockets, where there is no hook at all.

Friction failure can result from a reduction in the number of contact pairs “cassette tooth-chain link”. This is influenced by the position of the chain tension adjusting screw located on the rear derailleur. By turning this bolt, you can move the frame up or down.

From personal experience. The chain tension adjustment screw is usually used once when installing a new derailleur. During the adjustment, this bolt, like L, H, is not touched.

Worn chain-cassette-system

A bicycle, as well as a car, has its own consumables. These include all the components of the chain drive. Why do the chain and stars need to be changed periodically? Due to wear:

  • The chain is constantly lengthening. This leads to an increase in the distance between the elements of one link (rollers). And the interval grows due to the boring of the axes (pins) of their seats.
  • The chain, lengthening, changes the profile of the teeth or, as they say, sharpens the teeth for itself. The wear mechanism is not closely illuminated, but as a first approximation it is clear that there is plastic deformation of the teeth or the so-called “pulling”.

It is quite reasonable to ask why the chain slips on a speed bike only on some sprockets. The point is, everyone has their own favorite speeds. Usually there are two, maximum three small rear sprockets and one in front. The chain sharpens them, while others remain in the “novya” state, so the chain does not slip on unpopular gears.

Often a new chain jumps over the stars. This is due to the fact that it is installed on old stars. The teeth are stretched out for a larger pitch between the pins than with a new bike chain, which is why slip occurs. often the cassette is to blame, less often the system is also to blame.

How to prevent the chain from slipping on a speed bike under pedal load

If you have not touched the chain tension screw on the rear derailleur, and the mechanism itself works properly and accurately, there is no reason to go into its settings. An Intervention Has Occurred. Learn How Shimano Shifting Adjustments Are Made On A Mountain Bike.

Old bike chain slips

She stretched out to a critical level. If you want to be sure. purchase one of the control devices and estimate the degree of elongation:

  • Special chain gauge. The meter is simple and convenient.
  • Calipers. In terms of accuracy, this tool is preferable to caliber.
  • Roulette. The most inaccurate device.

How to control stretch.

Caliber

This is the easiest tool to control. It is calibrated to two sizes in percentage terms: 0.75% and 1%. How to use it? Insert the fixture between a section of several links with one foot, then turn the fixture over and place it in the same way. No matter how you twist it, you cannot make a mistake. Diagnostics makes one of three diagnoses:

  • You can ride. The chain is not considered to be stretched if neither side of the tester is slid.
  • The chain needs to be changed. The foot of 0.75% passes freely, but 1% does not.
  • Replacement of the bike chain and cassette with a set is required. If even 1% moves freely between the links, then the chain will slip, and the teeth of your favorite rear sprockets are already “extended”.

Attention! The gauge shows the distance between the rollers, not between the axes of the links. The roller diameter for Shimano, SRAM, KMC chains is the same. Campagnolo has a larger one, so the standard gauge does not fit them.

Caliper

The most accurate measurement tool. Adjust the inner dimension to 119 mm and measure the distance between the chain links. Based on the actual size, you can judge what to do with it:

  • 119.7-120.6 mm. You can continue driving.
  • 120.6-120.9 mm. Need to change.
  • than 120.9 mm. Replace with cassette.

Again, for Campagnolo, these control intervals are irrelevant and rarely monitored. Let’s say that it is customary to kill the same Record before the start of the overshoot (5,000-7,000 km), which means that control is useless.

Roulette

It is often used as the most accessible tool when there is no caliper or caliber at hand. With the help of a tape measure, the total length of the first 24 links (from the center of the first pin to the middle of the 25th axis) is measured, based on which the conclusion is drawn:

  • Up to 304.8 mm. The chain is new.
  • 304.8-306.4 mm. You can ride.
  • 306.4-307.9. Change.
  • than 307.9. Replace chains and cassette.

What exactly to do

If the old chain has already started to slip, feel free to buy a new cassette and chain. Inspect the system stars before installing new components. Their profile should not be unduly deformed.

bike, shifting, gears, chain, fails

And remember the classic rules:

  • One cassette is enough for three timely chain changes.
  • The favorite star of the system walks about 10,000-15,000 km.

A new chain slips

It would be nice to replace the cassette. If the previous chain did not jump over the stars, then you can leave everything as it is. the “novye” will roll in and the smoothness of the course will be restored. Depending on the degree of “stretching” of the teeth, running-in will take from 50 to 150 km.

Attention! Remember to inspect the system sprockets and ratchets. Please note that leaving everything as it is, the chain resource in km will be lower.

Educational program

If you create ideal operating conditions for the axles of the links of the bicycle chain, then the components of the chain drive can travel for years. about 10,000 km without any intervention. It is still possible to guarantee the absence of distortions, but it is difficult to ensure surgical cleanliness and the constant presence of grease in the roller-pin contact patch.

Note. The experience of operating the Shimano chain is about 10,000 km instead of the usual 1,500 km. To achieve this level, after each ride, clean all links with a kerosene-containing preparation, such as WD-40, and lubricate with a dust-repellent bicycle lubricant. Well, distortions, of course, are unacceptable.

Lubricate the bike chain

Nothing! The question is not covered in two sentences, but it is useful to delve into the topic. Therefore, take an interest in the best way to lubricate a bicycle chain at home.

The chain is lubricated regularly. The specific interval determines the type of lubricant used or the mileage, after which a rustle appears.

Choose one of the chain drive maintenance strategies

After reviewing the material on how to choose a mountain bike chain. you will realize that they do not all have the same resource. There are Shimano, SRAM and KMC, which are enough for 1,500 km on 50% dirt / 50% asphalt, and there are Campagnolo, which roll back up to 7,000 km under the same conditions.

You can use one of three basic cycling patterns:

  • Regular replacement. A gauge or caliper determines the moment when the cassette starts to eat up and the chains change.
  • In three chains. Each product is rolled out to 0.75% in caliber and the chain is put back on. The set rolls back up to 1% according to the gauge. The instance is installed again and rolled until slippage occurs, after which it can be disposed of. Two other bicycle chains also roll out to critical wear. After rolling out all three chains to overshoot, replace the cassette and system stars.
  • Campagnolo cheap Shimano cassette. The kit is killed before overshoots appear, after which the chain and rear sprockets are thrown out. The front ones change after the completion of the second cycle. The total rule is: 2 chains-2 cassettes-1 system.

The chain on the bicycle flies when changing gears. Why chain slips on a speed bike: 2 reasons and a recipe for treatment

Statements like “I’ve been rolling for the third year, with no maintenance, and everything is fine” ultimately lead to serious problems. Chain slip during power pedaling is one of them. This fact happens more often from ignorance: what and when needs to be changed. Less often, actions that contradict instructions for setting up individual components lead to interruptions in the smoothness of the chain.

Why Mountain Bike Chain Can Slip Under Load

There are, in fact, only two reasons. The rear derailleur is incorrectly adjusted or the chain and sprockets of the system and / or cassettes are worn out.

Upset rear derailleur

Why does a chain on a bicycle skip at all under load? It either jumps over the stars due to insufficient frictional force, or it got between the sprockets, where there is no hook at all.

Friction failure can result from a reduction in the number of contact pairs “cassette tooth-chain link”. This is influenced by the position of the chain tension adjusting screw located on the rear derailleur. By turning this bolt, you can move the frame up or down.

From personal experience. The chain tension adjustment screw is usually used once when installing a new derailleur. During the adjustment, this bolt, like L, H, is not touched.

Worn chain-cassette-system

A bicycle, as well as a car, has its own consumables. These include all the components of the chain drive. Why do the chain and stars need to be changed periodically? Due to wear:

  • The chain is constantly lengthening. This leads to an increase in the distance between the elements of one link (rollers). And the interval grows due to the boring of the axes (pins) of their seats.
  • The chain, lengthening, changes the profile of the teeth or, as they say, sharpens the teeth for itself. The wear mechanism is not closely illuminated, but as a first approximation it is clear that there is plastic deformation of the teeth or the so-called “pulling”.
READ  How To Hang A Bike On The Wall On The Balcony

It is quite reasonable to ask why the chain slips on a speed bike only on some sprockets. The point is, everyone has their own favorite speeds. Usually there are two, maximum three small rear sprockets and one in front. The chain sharpens them, while others remain in the “novya” state, so the chain does not slip on unpopular gears.

Often a new chain jumps over the stars. This is due to the fact that it is installed on old stars. The teeth are stretched out for a larger pitch between the pins than with a new bike chain, which is why slip occurs. often the cassette is to blame, less often the system is also to blame.

How to prevent the chain from slipping on a speed bike under pedal load

If you have not touched the chain tension screw on the rear derailleur, and the mechanism itself works properly and accurately, there is no reason to go into its settings. An Intervention Has Occurred. Learn How Shimano Shifting Adjustments Are Made On A Mountain Bike.

Old bike chain slips

She stretched out to a critical level. If you want to be sure. purchase one of the control devices and estimate the degree of elongation:

  • Special chain gauge. The meter is simple and convenient.
  • Calipers. In terms of accuracy, this tool is preferable to caliber.
  • Roulette. The most inaccurate device.

How to control stretch.

Caliber

This is the easiest tool to control. It is calibrated to two sizes in percentage terms: 0.75% and 1%. How to use it? Insert the fixture between a section of several links with one foot, then turn the fixture over and place it in the same way. No matter how you twist it, you cannot make a mistake. Diagnostics makes one of three diagnoses:

  • You can ride. The chain is not considered to be stretched if neither side of the tester is slid.
  • The chain needs to be changed. The foot of 0.75% passes freely, but 1% does not.
  • Replacement of the bike chain and cassette with a set is required. If even 1% moves freely between the links, then the chain will slip, and the teeth of your favorite rear sprockets are already “extended”.

Attention! The gauge shows the distance between the rollers, not between the axes of the links. The roller diameter for Shimano, SRAM, KMC chains is the same. Campagnolo has a larger one, so the standard gauge does not fit them.

Caliper

The most accurate measurement tool. Adjust the inner dimension to 119 mm and measure the distance between the chain links. Based on the actual size, you can judge what to do with it:

  • 119.7-120.6 mm. You can continue driving.
  • 120.6-120.9 mm. Need to change.
  • than 120.9 mm. Replace with cassette.

Again, for Campagnolo, these control intervals are irrelevant and rarely monitored. Let’s say that it is customary to kill the same Record before the start of the overshoot (5,000-7,000 km), which means that control is useless.

Roulette

It is often used as the most accessible tool when there is no caliper or caliber at hand. Using a tape measure, the total length of the first 24 links is measured (from the center of the first pin to the middle of the 25th axis), on the basis of which the conclusion is drawn:

  • Up to 304.8 mm. The chain is new.
  • 304.8-306.4 mm. You can ride.
  • 306.4-307.9. Change.
  • than 307.9. Replace chains and cassette.

What exactly to do

If the old chain has already started to slip, feel free to buy a new cassette and chain. Inspect the system stars before installing new components. Their profile should not be unduly deformed.

And remember the classic rules:

  • One cassette is enough for three timely chain changes.
  • The favorite star of the system walks about 10,000-15,000 km.

A new chain slips

It would be nice to replace the cassette. If the previous chain did not jump over the stars, then you can leave everything as it is. the “novye” will roll in and the smoothness of the course will be restored. Depending on the degree of “stretching” of the teeth, running-in will take from 50 to 150 km.

Attention! Remember to inspect the system sprockets and ratchets. Please note that leaving everything as it is, the chain resource in km will be lower.

Educational program

If you create ideal operating conditions for the axles of the links of the bicycle chain, then the components of the chain drive can travel for years. about 10,000 km without any intervention. It is still possible to guarantee the absence of distortions, but it is difficult to ensure surgical cleanliness and the constant presence of grease in the roller-pin contact patch.

Note. The experience of operating the Shimano chain is about 10,000 km instead of the usual 1,500 km. To achieve this level, after each ride, clean all links with a kerosene-based preparation, such as WD-40, and lubricate with dust-repellent bicycle lubricant. Well, distortions, of course, are unacceptable.

Lubricate the bike chain

Nothing! The question is not covered in two sentences, but it is useful to delve into the topic. Therefore, take an interest in the best way to lubricate a bicycle chain at home.

The chain is lubricated regularly. The specific interval determines the type of lubricant used or the mileage, after which a rustle appears.

Choose one of the chain drive maintenance strategies

After reviewing the material on how to choose a mountain bike chain. you will realize that they do not all have the same resource. There are Shimano, SRAM and KMC, which are enough for 1,500 km on 50% dirt / 50% asphalt, and there are Campagnolo, which roll back up to 7,000 km under the same conditions.

You can use one of three basic cycling patterns:

  • Regular replacement. A gauge or caliper determines the moment when the cassette starts to eat up and the chains change.
  • In three chains. Each product is rolled out to 0.75% in caliber and the chain is put back on. The set rolls back up to 1% according to the gauge. The instance is installed again and rolled until slippage occurs, after which it can be disposed of. Two other bicycle chains also roll out to critical wear. After rolling out all three chains to overshoot, replace the cassette and system stars.
  • Campagnolo cheap Shimano cassette. The kit is killed before overshoots appear, after which the chain and rear sprockets are thrown out. The front ones change after the completion of the second cycle. The total rule is: 2 chains-2 cassettes-1 system.

What to do if the bike chain falls off?

During the operation of the bicycle, the owner has to deal with a situation where the chain comes off during the ride. This situation is dangerous when driving at high speed, as well as in the process of screwing down a hill. Even if you use slip-on pedals with shoes to keep your foot from flying off the pedal, when the chain falls off, the cyclist can sprint over the handlebars or fall on his side. In this article, we will look at the main reasons why the bicycle chain flies, and also give practical advice on how to fix this breakdown.

The reasons

There are a number of reasons why the chain fails. They are listed below:

  • weak tension (applies to both bicycles without gears and with variable transmission);
  • curvature of one or more links;
  • deformation of one or more teeth in the chainring or chainring;
  • the chain is stretched as a result of prolonged use;
  • incorrectly configured front or rear derailleur.

Now let’s take a closer look at each problem. Here we will also offer solutions to emerging difficulties.

Weak tension

If your chain goes off on a bike without gears, all you need to do is unscrew the two nuts on the rear wheel axle and then pull it towards you. Tighten the nuts, but make sure that the wheel does not move closer to the center of the frame. By following these steps, you will see that the chain will not sag. Accordingly, the likelihood that it flies again is completely excluded. But in the case of this problem, on a high-speed bike you will have to sweat. A special spring is installed in the gear selector, which automatically pulls the chain. With prolonged use, it loses its elasticity, which leads to similar problems. Since the transmission is not separable, you will have to change the switch to a new one.

Curvature of one or more links

Such a problem can be encountered quite rarely, but it can still bother you at any time. If you notice that the links are curved, you have two options. The first is to completely replace the chain. The second is to get rid of the bent links using a special squeeze. Do not use this method on bicycles without variable transmission. It is recommended to use this method as a temporary solution on models with gear derailleurs.

Deformation of one or more teeth in the chainring or chainring

Why can teeth warp? The first obvious reason is due to impact, the second is due to severe wear. In any case, if the chain falls off solely due to problems with the cassette teeth, then it must be replaced with another one.

The chain is stretched due to prolonged use

This happens in the process of wear and tear. The switch spring cannot tension it normally, it constantly sags. In this case, there is only one way out. to replace the circuit with a new one. In practice, it is rare to find bicycles in which the chain is stretched and skips when shifting gears. It is virtually impossible to restore its elasticity.

Front or rear derailleur incorrectly configured

This only happens on bicycles with gears. All you have to do is adjust the rear derailleur as precisely as possible. The problem is quite simple to notice: the chain can randomly jump to another gear in the process of turning the pedals with great force, but you will not press on the shifter petal. There are two bolts on the switch housing, with which you need to adjust the travel limit of the mechanism.

If you see that your chain flies, it does not always mean that you need to change it entirely. It is possible that the problem lies elsewhere. If you do not want it to fly off at the most inopportune moment, we recommend that you carry out maintenance from time to time. Check the transmission very carefully for wear. A simple check before driving will help you avoid serious injury, especially if you prefer to ride in an aggressive or even extreme style. We hope that the tips above will help you avoid future breakdowns.

What to do if the chain comes off on a speed bike

A bicycle is a unique means of transportation. It does not pollute the environment, has a positive effect on the health of its owner, and allows you to experience physical activity in the fresh air. A bicycle is the first vehicle that a person gets in his life and for many it remains a favorite means of transportation for life. The most common problem faced by every cycling enthusiast is the chain flying off the bike. For what reasons this happens and what needs to be done to fix this problem, we will try to figure it out in this article.

Speed ​​bike problem

For a regular bike, this problem is easy to solve, but what to do if the chain jumps off on a speed bike? Among the most common causes of this problem are the following:

  • deformation of one of the stars. Gear shifting on multi-speed bicycles is carried out using cassettes consisting of several stars. These designs are collapsible and non-collapsible. Replacement of a damaged star is possible only in collapsible structures, if the structure is non-collapsible, its complete replacement is required.
  • Mistakes in the setting of the derailleur can cause the chain to fly off the bike when shifting gears. Gear shifting should be fine-tuned. If the bike owner himself cannot do this, you need to contact a specialist, or carefully study the instructions for setting the bike speed switch. The safety of the cyclist depends on the quality of this function.
  • Stretching the bike chain. This process is associated with long-term use of the chain, the application of high dynamic loads to it, irregular cleaning, due to which the residues of lubricants, mixed with dirt and dust, accumulate on the chain links. In this case, the chain must be shortened or replaced. To shorten the chain, you need to remove several links from it. This is done using a special squeeze tool. This simple tool is a must-have for every cyclist. With its help, the axle of the link (pin) in the lockless type bicycle chain is pushed out. If there is noticeable stretch on the bike chain, and the service life is long, it will be more advisable to replace it completely. To keep the chain in good condition, it must be periodically rinsed in kerosene and cleaned.
  • The curvature of individual chain links as a result of which the chain flies off the bike.
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Loose chain tension on bicycles without gears

To eliminate the problem that has arisen, you need to understand why it has arisen and tighten the chain. This is done using special wrenches that every cyclist should have with them.

It is much easier to tighten the chain on a regular bike, in the case of a speed bike it will be more difficult. For successful repair work, when the chain falls off the bike without speeds, you need:

  • turn the bike upside down.
  • If the rear wheel is attached with an eccentric, then you need to loosen it a little, or not completely unscrew the nuts.
  • Adjust the desired chain slack.
  • Tighten nuts.
  • Check chain tension and quality of work.

Rear wheel deformation

Perhaps the problem is the deformation of the rear wheel. One of the most unpleasant cyclists’ problem is the so-called “eight”. “Eight” is the deformation of the wheel, violation of its shape and the inability to perform functions. This problem is eliminated by tightening and loosening the spokes with a special spoke wrench. To do this, the wheel is removed, the affected area is determined and the central spoke of the “figure of eight” is highlighted. Then the needles are pulled through one.

How to increase the tightness of the bike chain

The case with high-speed bicycles is much more complicated. How to chain a bike at speeds?

The transmission unit for bicycles with speeds, of which the bicycle chain is an element, consists of cassettes with several stars. Therefore, the repair work to eliminate chain slippage and sagging on such bicycles has its own nuances. To understand the causes of the problem, you must:

  • If the chain constantly flies on a high-speed bike, it is worth checking if the sprockets are not damaged. If one of the stars in the cassette unit is deformed, the chain can be thrown over another star to continue moving. But in this case, you need to understand that you cannot switch the speed. This method is suitable in order to get home for better repairs. To eliminate the damage, the deformed star will have to be replaced, and if the assembly is not collapsible and the entire cassette is malfunctioning, then it must be replaced.
  • the chain flies on a high-speed bike the reason is a failure to set the speeds. Check the quality of the setting. Very often, a failure in the speed setting will cause the chain to hit. The setting is made according to a special scheme.
  • After eliminating the root cause, the chain must be put back in place.

To properly fit the chain on a speed bike, you need to disconnect it using a squeeze. If you take a new chain, then you need to measure the required length, for which the chain is thrown over the large stars of the cassette blocks and connected, measuring the required distance. The excess piece of the chain is removed using a special squeeze tool. By turning the screw, the link axis is displaced and the unnecessary chain section is removed. Then the chain is passed between the speed switches and connected using the same tool.

If the chain flies on a children’s bike, then, depending on the design, the same actions are performed as with an adult bicycle.

A malfunction of the transmission unit on a high-speed bike can threaten the health and life of its owner, the cyclist can fly out of the saddle by inertia, so you need to remember to carry out preventive maintenance work on the chain, check the condition of the speed switch and the integrity of the main parts. It is especially important to carry out a technical inspection of your vehicle before starting the movement, in the event that you make long cycling and crossings. Timely diagnostics of your bike is a guarantee of safety.

Reasons for chain slipping on a bicycle under load, repair step by step

Cassettes, chain and other bicycle parts are subjected to constant loads during operation, so their deformation is not excluded. Regular cleaning and lubrication will significantly extend the life of the parts, but they are not a solution to the problem. Answering the question of why the chain slips on a bicycle under load, it is worthwhile to understand that even following all the recommendations for caring for the transmission does not exclude the gradual wear of the elements. In this case, you will need to replace them.

Reasons for malfunction

Often, users ask the technicians about what leads to the rapid wear of the transmission and how to find a malfunction. The first sign of its malfunctioning is when the chain falls off on a high-speed or regular bike. This can be detected by depressing the pedals and simultaneously changing gears. The problem is noticeable when climbing a slope when the driving force increases. Reasons that lead to the chain slipping on a bicycle under load:

Take the survey

  • Links are elongated due to wear.
  • Front and rear sprocket teeth are thinned.
  • Combination of two factors at once.

The reason for the lengthening of the links is the stretching of the chain. A working part has a length of 304.8 mm. When the switch spring cannot tighten the path, this becomes the reason for the sagging of the described part, its scrolling when changing gears. In this situation, the only correct solution is to install a new element.

Damage and wear and tear lead to deformation of the stars, thinning of the teeth. It is impossible to fix such a part, so it needs to be replaced. When the chain slips, the cause can be both the stretched part and the wear of the sprockets. This is due to the fact that the spacing between the rollers of the part is reduced, and, as a result, the teeth of the elements become thinner. By comparing the width of new and used stars, determine the degree of production.

Another reason why the chain slips on a bike under load is incorrect gear shifting. This leads to serious misalignment of the element, as a result of which some parts are subjected to increased stress, which leads to rapid wear. Incorrectly adjusted calipers are another reason for a sudden jump, chain bounce or chain jam.

The chain is stretched as a result of wear The sprocket links are thinner Incorrect gear shifting

Elimination of breakage

Often, users are interested in what to do if the chain on the bike flies constantly. The repair algorithm depends on the type of bike. To eliminate the cause of scrolling the tract while loading the pedals of a conventional bicycle, you need to:

  • unscrew the rear wheel axle nuts;
  • pull it towards you;
  • ensuring the immobility of the wheel in relation to the center of the frame, tighten with nuts.

Performing the same work on a high-speed bike is more difficult. First, you need to measure the stretch of the chain. in the worn part, the size of the part does not match the pitch between the teeth of the stars. The result is a transmission failure. The level of production must be determined as follows:

  • using a tape measure, measure 24 segments of the path on the stretched upper part (normal value is 30.5 cm);
  • determine the distance from 1 to 25 axis.

In this way, the degree of stretch is determined. Failure detection affects transmission performance. If the chain falls, the timely replacement of the part will avoid many problems in the future.

Results from 30 cm 64 mm to 30 cm 79 mm indicate that stretching has reached a critical state. In this case, install a new chain and sprockets.

To avoid problems, you should follow a specific algorithm. Instructions on how to put the chain if it flew off on a bicycle with several speeds:

  • on a special squeeze, place the link in such a way that the pin is in front of the axis;
  • slowly turn the handle until the pin is squeezed out almost completely;
  • install a new chain, starting to fix the switches with small stars;
  • put a chain on them, taking into account the location of the tension rollers;
  • aligning the links, clamp the chain, press in the axle.

After installing the chain, turn the pedals to check the operation of the element. It is advisable to do this with pressure. If all the steps are performed correctly, the bicycle chain will not fly off, sag.

To replace the cassette, you will need the following tools: an adjustable and wrench with a chain, and a retaining ring puller. Step-by-step instruction:

  • remove the wheel;
  • install the puller, making sure that the spitz is in the retaining ring;
  • make sure that the handle of the key with the chain from the cassette is located on the right side, and on the teeth of the star from below so that its links lie tightly;
  • put an adjustable wrench on the cassette remover, holding the whip to prevent the stars from turning; turn it counterclockwise;
  • turn out the locking wheel;
  • dismantle washers, stars, laying them out in the same order to facilitate subsequent installation;
  • pins, grooves of bushings and stars are of equal dimensions, which facilitates correct installation;
  • put on stars and spacer rings in turn;
  • install the extreme gear, screw on the retaining ring, check the correct assembly, tighten it up to the stop with a puller.

To prevent the chain from slipping off the rear large sprocket of the bike, it is worthwhile to install a damper. Rockrings they are equipped with protect elements from damage while overcoming obstacles.

Step-by-step instructions on how to install dampers:

  • prepare tools: hexagons, rubber clamps, keys for removing bonks, carriage pullers, grease, squeeze;
  • dismantle the stars with connecting rods so that the large one is located on the middle one;
  • screw on the rockring;
  • determine the correct position of the roller;
  • tighten the bolts;
  • drip in the area of ​​the fastening bolts with threaded clamps;
  • install connecting rods;
  • put stars on the tract;
  • fix the rollers;
  • align the spacing between the inner pancake so that it matches the outer one; the chain should not touch the pancakes;
  • tighten the bolts all the way.

The installation must be carried out strictly following the instructions. Only in this case can the long-term operation of the transmission be guaranteed. Accelerators are mounted on some high-speed bikes.

Adjusting the switches on the new bike

The chain comes loose when shifting gears on a speed bike even when there is no wear. The reason is incorrectly configured switches. The problem is inherent in new bikes, and is also possible after replacing transmission parts. General scheme for adjusting the switches when the chain bounces:

  • set the optimal tension of the cables;
  • regulate the course in low gears;
  • on high sprockets adjust chain travel.

It is important that the chainring tensioner is correctly aligned to compensate for chain slack. Step by step instructions for adjusting the rear derailleur:

  • Loosen the screws and pull out the drive cable.
  • Set low gears, setting the path to 1: 1.
  • Turn the screw until the guide roller aligns with the star.
  • Install the cable into the switch.
  • Scrolling the pedals, adjust the highest gears: the tract in front on the largest sprocket, in the back. on the small.
  • Turn the screw until the sprocket matches the roller. The correct value for the tensioner position is 5 mm.

Following the same step-by-step instructions, adjust the front derailleur. Upon completion of the adjustment, check the operation of the transmission, the tension of the path under load. A properly tuned speed system will reduce wear and tear and, thanks to timely troubleshooting, the transmission will last for a long time. After adjusting the switches, you don’t have to guess why the chain jumps.