The chain came off on a high-speed bike how to dress

Loose chain tension on bicycles without gears

The rear fork of a conventional bicycle, without shifting speeds, changes its position relative to the axis of the rear hub under the action of loads and vibration. Chain drive slack increases. A slight push releases the chain from the sprocket teeth. The chain slips off. To fix the problem, you need to follow the steps in sequence:

  • Flip the bike.
  • Loosen tensioning bolts.
  • Set the wheel to the required depth.
  • Tighten the bolts firmly in the new location.
chain, high-speed, bike

Allowable chain slack

You will enjoy cycling and the chain will no longer fly off if you set the wheel properly. Correct position implies:

  • lowering of the chain by about 5 mm. the “in line” state makes it difficult to spin the pedals;
  • the axle of the rear wheel hub must be perpendicular to the plane of the frame. Otherwise, the risk of deformation of the rim increases;

Loose Chain Highside Crash. Mulholland

To improve the grip of the nuts, use spring washers.

If critical slack is not eliminated in the extreme position of the sprocket, you need to rivet the links to reduce the length of the chain.

Why the chain falls off. What to do when the chain falls off and the pedals spin

Everyone knows why you need a chain on a bicycle. But not everyone knows all the subtleties of its device and what danger its malfunction conceals in itself. Therefore, it is so important to know how to properly tighten the chain.

The bicycle chain is one of the most important parts of this type of transport. Its main task is to transfer the energy of the cyclist’s muscle work to the rear wheel. In addition, they are the driven link of the bicycle gearbox. Such a mechanism is formed due to the fact that the driving sprocket (which is on the pedals) is always made larger than the driven sprocket (the sprocket on the wheel). Thanks to this, a law of leverage is formed, which allows you to transform one type of energy into another.

If we talk about those bicycles on which there are several gears at once, then the chain is assigned an even greater role. In such a system, the chain drive acts as a floating transmission link that connects the drive sprocket to the driven sprocket. At the same time, it is not difficult to guess that if the chain breaks off, the transport will not be able to go further. And it happens quite often if the cyclist forgot to tighten the chain.

Adjusting chain tension on bicycles without gears

For bicycles to function flawlessly without speeds, their chain must not be too tight. It is necessary to ensure its free sagging for a length of up to 5 mm. And in order to pull in this way, you need to perform a certain set of actions in the correct sequence:

  • Turn the vehicle over with the wheels up.
  • Loosen the rear wheel. unscrew the nuts or fastening eccentrics.
  • Adjust the chain slack to the required amount. To do this, you need to carefully move the wheel along the inclined grooves (dropouts).
  • At the end of the adjustment, the wheel should be fixed in its original position again. In this case, the wheel axle must be parallel to the carriage shaft.

If the chain is too tight, it will become difficult to pedal. And the elements of the chain drive will very soon become unusable. It is also bad if the bike chain is too slack. She will simply jump off the stars at a certain moment and it will be impossible to go further.

When the wheel literally rested on the dropouts and there is absolutely nowhere to move it further, but at the same time the bicycle chain is dangling, you will have to remove a couple of links from it. In all likelihood, it was stretched or was not at all the size for a particular model.

The tension of the chain on a bike with a parallelogram derailleur (rear) is determined solely by the spring stiffness of the derailleur itself. But the chain, which turned out to be too long, will begin to beat against the frame, since the tensioner will no longer be able to compensate for its slack.

It should be borne in mind that insufficient chain length leads to wear of the main transmission parts, since it significantly complicates their switching. And especially it is necessary to pay attention to this owners of two-suspension bicycles.

When installing a new bike chain on high-speed models, the chain should be shortened. Several links. But to determine how many specific links need to be removed, there are two possible methods:

  • Pull the chain at the front and rear over the largest sprockets. And then pull on the chain, moving the rear derailleur forward and to the limit. It remains to add 2 links, and you get a chain of optimal length.
  • Or the chain needs to be thrown from the front to the largest sprocket, from the back to the smallest. And pull the chain until the rear spreader frame is in the “straight down” position and the derailleur rollers do not form a horizontal line. This is the optimal chain length, the excess must be removed, and the missing must be added.

On two-suspension bicycles, adjust the chain (or rather, adjust its length) more correctly by pressing the pendulum down to the position at which the front star cassette will be as far away from the ratchet as possible. The resulting chain length is measured-noted, and all unnecessary is removed.

Conventional speedless bikes are equipped with collapsible chains, one of the links of which has a special lock. But on professional bikes, one-piece chain structures are installed, all links of which are perfectly riveted.

However, disassembling a one-piece bicycle chain is also easy. And this can be done in one of two possible methods:

  • grind pin heads on one of the chain links with sandpaper;
  • or using a universal tool. squeeze.

When your chain breaks at 189mph

By the way, it is not for nothing that the pomace is called “universal”. It can not only squeeze out the pin, but also securely fix the newly assembled bicycle chain. After all, the squeeze (well, at least most of them) have a couple of special functional and technological grooves. And one of these grooves the pin is pressed out of the roller, and the other is pressed in. As for the installation place, which is located on the squeeze a little further from the pressing screw, it is intended for riveting the chain pin itself.

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The most important element in the design of both children’s and adult professional bicycles is the chain, which determines the ride quality, ride smoothness and smooth gear shifting. Before pulling the chain on the bike, you need to make sure that its length is chosen correctly: in the normal state, the chain can be in a slightly free state, sagging by 3 mm, but not more. In general, the question of how to properly tension the chain on a bicycle is always relevant, since it is part of the mechanism that determines the movement and will often require maintenance due to the large number of rubbing parts. You can check the tension of the chain as follows: press it with your finger approximately in the middle (opposite the outer radius of the rear wheel) and measure the amount of slack. If it is more than 1.5 cm, the chain must be tightened.

So, to tighten the chain on a bike that has only one gear, you must first turn it upside down, placing it on the seat and steering column. Next, you need to loosen the rear wheel fasteners (in most cases, the wheel is fastened with eccentrics or nuts), but not completely remove it. Then you need to find a special adjustment groove, which is called a dropout (from the English ‘’ drop out ’’ ’- to lower), and move the wheel to one side or the other. After the required chain length has been selected, the wheel should be fixed back, making sure that the plane of the wheel axis is parallel to the plane of the carriage shaft (this will prevent the development of the “figure eight”). It is important to know that it makes no sense to tighten the chain too tightly for two reasons: firstly, it is very difficult to pedal when the chain is too tight, and secondly, the complete wear of the chain elements occurs much faster.

It is necessary to know how to tension a chain on a bicycle of a conventional design without gears, but at the same time you should be able to remove unnecessary links from the chain, since there is often a situation when the wheel has nowhere to move in the groove, and the chain still sags. In this case, you will need a special tool. a squeeze, with the help of which the roller is removed on the weakened chain and two adjacent.

It is somewhat easier to tighten the chain on a bicycle with gears, since it is partially regulated by a parallelogram switch (the gear shifting itself is based on the principle of adjusting the length and stiffness of the chain), however, even the mechanics cannot compensate for a chain that is too long, as a result of which problems with the movement of the bicycle at medium speeds may occur To start adjusting the chain length on a bicycle with gears, you must also set it up with the wheels, then switch to the largest sprocket both front and rear, thus determining the upper gears.

After that, the rear derailleur should be pulled forward by the chain as far as possible, and the chain on the shifting system (where the pedals are) should also be taken slightly forward in order to determine the optimal chain length. Then the chain is released and carefully put on the special teeth. The idea is that after a complete run of the chain, the mechanical switch will use the rollers to pick up the normal position. It, of course, if desired, can be firmly fixed in one state or another, but in this case, switching will be impossible. After such a rough adjustment, you should proceed to a finer one, setting the chain at the pedals to the largest sprocket, and at the rear wheel to the smallest. For the chain, it is worth finding such a position in which the axes of the switch rollers, if not connected to one vertical line, but at least close to this.

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 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 bounced when shifting gears. It is virtually impossible to restore its elasticity.

An easy way to check the chain for tension

Insufficient tension

If you have a bicycle without gears, first unscrew the nuts on the rear wheel, there are two of them, pull the wheel towards you. Then put the nuts back in such a way as to prevent the wheel from shifting towards the center. That’s all there is to it. It will be more difficult to fix this problem with a unit with speeds. There is a spring in the gear derailleur of a high-speed bike, which independently tightens the chain, over time it stretches, in which case you need to change the derailleur.

Link curvature

In the event that the chain falls off due to the curvature of the link, you must either change it all, or use a special tool to remove the bent links.

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Important! Unfortunately, this method is not effective on sports cycling.

Loose chain tension on bicycles without gears

The rear fork of a conventional bicycle, without shifting speeds, changes its position relative to the axis of the rear hub under the action of loads and vibration. Chain drive slack increases. A slight push releases the chain from the sprocket teeth. The chain slips off. To fix the problem, you need to follow the steps in sequence:

  • Flip the bike.
  • Loosen tensioning bolts.
  • Set the wheel to the required depth.
  • Tighten the bolts firmly in the new location.

Allowable chain slack

You will enjoy cycling and the chain will no longer fly off if you set the wheel properly. Correct position implies:

  • lowering of the chain by about 5 mm. the “in line” state makes it difficult to spin the pedals;
  • the axle of the rear wheel hub must be perpendicular to the plane of the frame. Otherwise, the risk of deformation of the rim increases;

To improve the grip of the nuts, use spring washers.

If critical slack is not eliminated in the extreme position of the sprocket, you need to rivet the links to reduce the length of the chain.

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 sprockets. 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 to the house for better repairs. To eliminate the breakdown, 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 of the speed setting. 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 attach the chain to a speed bike, you need to disconnect it with 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 pushed out 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 bicycle, 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 trips and crossings. Timely diagnostics of your bike is a guarantee of safety

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 during the pedaling process with great force, but at the same time 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.

Rear derailleur adjusting bolts

If you see that your chain is falling off, this 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 for this, we recommend that you carry out maintenance from time to time. Check the transmission very carefully for wear. A simple check before driving can help you avoid serious injury, especially if you prefer to ride in an aggressive or even extreme style. We hope the tips above will help you avoid future breakdowns.

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. On models with gear derailleurs, it is recommended to use this method as a temporary solution.

Bent link

How to remove scrolling on a bike

The first step is to completely lubricate the chain mechanism and clean out all dirt.

Pay attention to the space between the rollers and the sprockets. Before starting to repair the chain, it is necessary to remove the rear wheel, because without this procedure it will not be possible to dismantle the transmission

The next step is to replace the sprocket and associated chain. Replacement must be done in a comprehensive manner, otherwise all repairs will go down the drain and pedal overshoot on a regular bike will be a permanent and long-term phenomenon.

How to fix this kind of breakdown? It is enough just to dismantle and remove the wheel, disassemble the hub mechanism into separate spokes, inspect and evaluate the parts of the hub, roller and cone axle for possible wear.

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You can, of course, try to take the cone to a specialized workshop for grinding, but this will be a waste of time, because the wear will not be eliminated in this way. It is necessary to completely change parts.

We repair a high-speed bike

To determine exactly why scrolling happens on a high-speed bike, it is worth determining the degree of wear on the rear sprocket system. To do this, dismantle such a unit, thoroughly clean the space between the elements, wipe the part with kerosene.

To understand the reason for scrolling on a high-speed bike, you need to determine the degree of wear of the rear sprocket system.

After that, you can start checking the bearings and teeth of the sprockets. Knocked out or scattered parts should be replaced. Sharpened or crooked teeth indicate that it is time to replace that part of the assembly. Wear on the smallest elements will give the most pedal creep.

After replacing damaged parts, the entire system should be properly lubricated with suitable compounds.

The cranking problem on a high-speed bike, as well as on a regular bike, can often be associated with a failure of the rear hub. In this case, it is necessary to remove the cassette, carefully check the condition of the roller pushers, bearings, and the cone itself. It is better to replace the worn-out parts with new ones, and then install the entire system back. After the completed work and the installation of new elements, your iron friend will be as good as new and you will forget about scrolling for a long time.

So we figured out the causes of idle scrolling. We studied the options for their elimination

If your bike chain keeps falling off

It is very important to systematically clean and lubricate the undercarriage of a two-wheeled vehicle and then many problems with the bike’s performance can be avoided.

Removing and putting on the chain on the bike

Quite often it becomes necessary to remove and then put the chain back on the bike, for example, when cleaning the chain, replacing or changing its length. To do this, you must first disconnect and then reconnect the bicycle chain. This process is very easy if the chain has a special connecting lock, but if the chain is without a lock, then a special tool will be required to disconnect the chain. squeezing the chain. What other tools may be required for repair, we read in our article. tools for repairing a bicycle. Let’s take a closer look at the case with and without a lock.

Bicycle chain extractor

How to remove a chain with a lock

As already mentioned, this process is very simple and in most cases no special tools are required. Despite the wide variety of types of locks, they all disconnect in almost the same way. If, nevertheless, it is impossible to disconnect the lock manually, then you can use a special tool (see the figure below).

Variety of bike chain locks

Disconnecting the chain lock

How to remove a chain from a bicycle without a lock

If the chain does not have a lock, then a tool is needed to remove it. squeezing the chain. Without a squeeze, it is quite difficult to disconnect the chain and the chance of damage to the chain links is very high, and it is almost impossible to connect a chain opened in this way. If the chain has to be removed often enough, then it is better to have such a tool in your arsenal, squeezing the chain greatly simplifies working with the chain without a lock.

In order to disconnect the chain without a lock, it is necessary to press out one of the pins (link axis), just for this procedure we need a squeeze. Any link is suitable for this operation, but it should be borne in mind that the next time it is pressed out, it is worth choosing a different link, since each time the pin looses more and more. Ideally, a connection lock should be purchased and installed.

So, we proceed to the direct riveting of the chain. The chain link must be inserted into the squeeze (as in the picture below). It is worth considering that most puckers have two grooves for placing the chain, in this case you need to install the chain in the groove closer to the fixing screw. The second groove is only needed for adjustment.

One end of the pin must remain in the link

How to chain a bike without a lock

Before reconnecting the chain on mountain and sports bikes, it must be correctly pulled through the rear derailleur rollers, see fig. below, marked with a red line:

Correct chain position

Next, go to the direct connection of the chain link. To do this, it is necessary to carry out the same operation, only in reverse order. We place the chain in the groove near the fixing bolt so that the protruding pin looks at the squeeze nose. Twisting the handle, smoothly push the pin back until it fully enters the link. After this procedure, the links into which the pin was pressed should move freely, if this does not happen, then you need to use the adjusting groove for the chain squeeze. Having placed the desired link in the adjusting groove, it is necessary to ensure that the ends of the pin protrude from both ends equally.

The chain links must move freely.!

If the chain is from Shimano with a disposable connecting pin, press it into the link using a squeeze and break off the rounded end. This tip is needed to simplify the process of pressing the pin.

Shimano chain link pin

Here, in principle, is all you need to know about how to put on and remove the chain on a bicycle, as well as disconnect and connect the chain without a lock. If you have experience in disconnecting circuits without squeezing, we ask you to share it with us and our readers in the Комментарии и мнения владельцев below.