How to fix a broken bike chain


Its peculiarity is that it has a special clamping device. Removing one from the stars, as well as putting it back on, is not difficult. To do this, you just need to disconnect the lock.

You can locate the detachable link by visual inspection. If the links are clean, finding the connector is easy. As a rule, the manufacturer’s brand is stamped on the connector.

The work has been completed. As you can see, there is no difficulty in removing the bike chain and putting it back on. It remains to check the correctness of what was done by scrolling the pedals. If the cycle runs freely, but without sagging, then everything is done correctly, and its length is optimal.

Types of bike chains

Consider the 2 main types of bike chains:


It is impossible to completely remove such a cycle. If you remove it completely from the sprockets, it just hangs on the frame. Of course, compared to the version equipped with a lock, the solid construction is less convenient. However, there are also advantages. The lock can loosen, the connecting plier can be lost. The links are disengaged. There are no such problems with a continuous chain. If it is torn, then this is exclusively a quality cost.

The chain breaks as usual?

Most often, the chain breaks when you pedal at full power and simultaneously shift the gear on the front derailleur. Other causes of chain breakdowns are very rare, one in a million at best. You only get a chance to meet them if you bike a lot. For example, a nail flew out from under my front wheel, hitting the chain and hitting the sprocket. Who would have thought that this could happen?

What you need to repair your bike chain.

To repair a damaged bike chain, you only need a chain fitting tool. It is compact and usually found in many multi-functional bike repair tools. Perhaps a similar tool is included in one of your multifunctional tools and you just did not know what it was for.!

At home, repairing a bicycle chain can be done with a hammer and pliers, but you can’t take them with you on the road. On a trip, the chain will only have to be repaired with a lightweight chain mounting tool.

Is it worth repairing a bike chain on the road at all??

It is best not to repair the chain on the road. Repairing a chain is one of the dirtiest jobs. If you are wearing new clothes, then after repairing the chain, you can most likely say goodbye to it. Probably the best solution would be to call a taxi or attach the bike to the bike lock and go home by public transport. then you will return in your old clothes and calmly repair the chain.

Disconnecting a chain with and without a chain installer.

To start pushing the pin out of the chain, turn the handle on the chain installer (see photo). Try to align the axle on the chain mounting tool with the pin on the chain (sometimes it slips a little).

Do not push the pin all the way in. push it in just enough to disconnect the circuit (see photo). The rest of the pin must be left in the chain so that it can be easily pushed through later.

If you do not have a tool to install the chain, then you will have to find a piece of wood and drill a small hole in it. Place the pin to be removed over the drilled hole. Find a small mounting screw about the same size as the pin and use it as a stud. Hit it with a hammer to knock the pin out of the chain to the required distance. Beat very carefully so as not to knock him completely out of the chain.

Adjust the link just installed.

Once the pin is in place, the attached link will not bend well. Move the link back and forth (see photo) until it bends well so that it can easily pass around the gears.

Look at your hands. now you can feel like a real bike mechanic.

Using the old chain.

If you just installed the new chain in a comfortable environment at home, then don’t throw the old chain away. you can use it as a supplier of replacement links! Since you have already learned how to remove and install links, you can use the old chain as a saddle lock. A good saddle is now very expensive and additional protection against theft will not interfere with it.

In addition, you can make a bracelet or earring from the chain yourself. But you have to make a rather large hole in the ear and the ear itself must support the weight of such an earring.

The chain breaks as usual?

Most often, the chain breaks when you pedal at full power and simultaneously shift the gear on the front derailleur. Other causes of chain breakdowns are very rare, one in a million at best. You only get a chance to meet them if you ride a bike a lot. For example, once a nail flew out from under my front wheel, hitting the chain and hitting the sprocket. Who would have thought that this could happen?

How does a bicycle chain work?

The chain links are connected to each other using a steel pin. To remove or install a link, remove or hammer in the pin using a chain tool (or hammer). To repair the chain, you simply need to remove the damaged links and connect the ends of the chain to the undamaged links. On bikes with classic derailleurs, the chain is slightly larger than it needs to work, so you can painlessly remove a few links. On single-speed bicycles and bicycles with planetary hubs, links that can be removed painlessly will most likely not. So in this case, you will have to bring a new chain or an old chain with which you can remove the missing links.

Elimination of defects

A common form of wear is chain slack when chain length increases from original length. Previously, the critical values ​​of the length of the bicycle chain were considered, at which it cannot be used. Everything is correct, but the chain does not have to be thrown away immediately, but it can be repaired. Under prolonged loads, the axles loosen, which causes longitudinal and lateral expansion. It is impossible to eliminate the transverse, but it is quite possible to tinker with the longitudinal.

How To Fix A Broken Bike Chain | Jon’s Easy Roadside Repairs

It is necessary to remove unnecessary links in such a way that the chain calmly, without interference, passes over the large star. With the help of a squeeze, excess links are removed, the axial shafts are completely pulled out of the removed elements. The main thing here is not to make a mistake and not pull out too many links.

If you have to ride with a stretched chain, then in order to avoid its falling off, you can install the so-called chain dampers. parts that prevent the chain from flying off when driving. There are several types of such devices:

  • Roller with two locks.
  • Wide rollers.
  • Frame (or rollerless).
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Using pacifiers as protection is fine, but it would be better to consider changing the circuit.

Malfunction symptoms

First of all, attention should be paid to chain malfunctions on multi-speed bikes. Traditionally, the travel time is determined by the mileage, but these values ​​are too approximate, because everything depends on the conditions of cycling: road quality, gear selection, speed, load on the pedals and, accordingly, on the chainring.

The first signs of a bike chain failure are inaccurate gear shifting and suspicious sounds (provided the chain has not lost its lubrication). The following method will probably help to determine the malfunction: bend it away from the largest sprocket and see the number of free teeth. If the chain comes loose from three or more teeth, then replacement is required urgently. Two prongs “warn” that wear is just around the corner, but you can still ride.

Using the same method, you can see the weakening of the chain on a single-speed bike: bend it away from the chainring and look at the number of teeth.

Another way to measure wear is to measure the length:

  • 304.8mm. Optimum Chain Length.
  • 306.5. 307.5. average wear, suitability for repair. You can ride while you can.
  • 308 mm. high degree of wear on both the chain and the sprockets.
  • than 308 mm. damage to the entire transmission.

Measuring elongation requires removing the chain completely from the bike.

How to replace a chain on a bicycle?

The chain is the key element of the bike’s transmission assembly. Sequentially passing through the teeth of the drive sprockets, it transmits torque to the rear wheel, thanks to which the bike rides. In the process of movement, the chain mechanism is subjected to dynamic loads, which over time leads to its wear.

On singlespeeds, as a rule, the chain is designed for the entire life of its operation: when moving along the stars, it walks smoothly and straight, without deviations. Chains are more complicated on multi-speed bicycles: there is no right angle between the front and rear sprockets, which is why it is always at an angle relative to the frame. The stresses on the chain mechanism increase several times compared to parallel transmission, which leads to periodic wear. To avoid damage to the entire transmission unit caused by wear of the chain, it must be replaced in time.

Not only do the “speed” chains need to be removed, they are often removed from single-speed bikes for periodic repairs or cleaning. How to remove the chain from the bike and put it back, we will tell you in this article.

Lock and solid chain

The locking chain is equipped with a special clamping device. It is not difficult to unhook and put on it. you just need to disconnect the lock. To find it, we carefully examine the chain on both sides and find a detachable link. In principle, it will not be difficult to find it on a clean chain: a tick is put on top, which fixes the link and does not allow it to move apart. Also, the manufacturer’s inscription is usually embossed on the key link. If you cannot find the lock for a long time, then either the chain is dirty, or it is lockless, or solid.

A bicycle chain without a lock simply cannot be disconnected: all the links on it look the same, however, and are hooked together too. This is a big inconvenience when cleaning, for example, it is necessary to carry out a “general cleaning” in a solvent. In the case of the keylock, everything is simple. I stole it and put it in kerosene. Solid bike chain, even taken off the stars, will remain hanging on the frame.

In terms of removal, a chain with a lock is, of course, more convenient than its counterpart. However, for some reason, the fastening may loosen: the tick fly off, and the link itself can be disengaged. There are no such weak points on bicycle chains without locks, and if it is torn, then the point is solely in its quality.

Opening the lock and squeezing the link axis

It is quite simple to open the lock: use a screwdriver or other object (for example, a knitting needle) to pry on the pincer clamp. The main thing here is not to damage it, or even better. not to lose it, otherwise it will not be possible to fix the chain later. Next, we decouple the entire link. That’s it, you can remove the chain and do whatever you want with it: clean it, throw it away or shorten it. However, we’ll talk about this a little later.

It is possible to separate a continuous chain only with a special tool. a squeeze. With its help, it will be possible to easily disassemble the link without damage. The procedure is simple, but you shouldn’t rush:

  • First, select the link for disassembly.
  • We insert the chain into the position of pressing out and pressing in the pin (link axis).
  • Use the handle to tighten the screw and take out the axle. Extrusion direction. towards the squeeze screw, that is, towards yourself.

You should not completely extract the pin, since it will not be easy to return it to its place later.

The squeeze will loosen the axle a little, so a different link should be selected when re-disengaging. Pressing the axle into the link is carried out in the opposite order: connect the adjacent links together and press in the pin with the screw.

Fitting the chain to the bike

To put the chain on the singlespeed, it is enough to hang it on both stars, press in the pin or click the lock. With high-speed bikes it will be a little more difficult:

  • Fix switches to small stars.
  • With regard to the location of the tensioning rollers, put the chain on the stars.
  • Combine links.
  • Clamp the chain and press in the axle. If the bike chain is with a lock, we do without squeezing.

After the installation is completed, it is necessary to check the course of the chain: rotate the pedals several times. If there is no sagging or obstruction during twisting, then the chain is of the optimal length and is installed correctly.

Every owner of a two-wheeled horse will be able to cope with the removal and installation of a bicycle chain. An uncomplicated and simple procedure will not take much time, but it will perfectly help on further trips!

Scrolled on a racing bike

Cranking on a speed bike is often caused by a rear wheel defect found on many modern models. It can be more difficult to fix the working mechanism on a high-speed bike than on a simple bicycle, since the chains on the first are more whimsical than on the second, and require work with a large number of links.

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Mountain bike pedaling

Mountain bike scrolling can also be caused by erasing complex hub parts or chain damage.

broken, bike, chain

They are associated with driving over rough terrain at high speed. The risk of occurring deformations obliges the owners of such bikes to carefully inspect their vehicle every time after a bike ride.

Scrolling on a road bike

To find out why the pedals on a road bike spin, you need to pay attention to the features of its structure. Road bikes and any foot-operated bicycles are particularly prone to bushing wear. Over time, its components stop clinging to each other, and the mechanism of operation goes wrong. The wheel rotates at idle, as the pedal scrolls the stars, not the wheels.

Reasons for the appearance of scrolls

Most likely, the scrolling on the bike was the result of the wear of one of the parts. It remains only to understand which one. The most vulnerable points of the pedal mechanism are:

  • chain;
  • rear sprocket;
  • rear wheel hub and parts thereof.

What to do if suspicion falls on one of the listed elements? As a rule, these details “hint” to us in advance that it is time to take care of them. An attentive cyclist anticipates a problem and does not lead to a complete breakdown. If the cranking nevertheless begins unexpectedly, a careful examination of not only the pedal, but also the entire driving mechanism will help to remove it. When examining your bike, you should pay special attention to:

  • rear hub;
  • front wheel sprockets;
  • cassette or ratchet;
  • chain.

Eliminate scrolling on a bike

Troubleshooting can be broken down into several steps. The rear wheel must be removed first to be able to dismantle the transmission. The chain and the entire chain mechanism must be cleaned and lubricated. Especially carefully it is necessary to process the gaps between the rollers and the sprockets. Then you need to replace the sprocket and the chain itself. You cannot limit yourself to one thing, because the mechanism works as an integral system: removing a minor malfunction does not mean that it has solved the problem. The repair itself comes down, in fact, to finding and then replacing the damaged part. When the wheel is removed, it is necessary to sort out the bushing along the spokes, inspect each separately, check whether the roller is worn out and whether the cone axis is intact.

It is not necessary to grind the taper shaft in a special workshop, even if you are assured that this will solve the problem. Wear is wear: the part must be replaced with a new one.

How to remove scrolls on a bike

Sooner or later, every cyclist is faced with such a problem as scrolling the bicycle pedals. In a similar way, a failure occurs in the operation of the so-called connecting rod-pedal group, which is responsible for the normal movement of the bike. To eliminate the malfunction, you need to determine which of the parts has become unusable.

Prevention of pedal scrolls

Keeping clean, as in the human world, helps a lot to maintain cycling “health”. Why does scrolling occur even after replacing worn parts? Due to lack of maintenance of the bike and its parts.

In order to clean the bike cassette, it must be removed. With a pre-prepared brush with flat bristles, you need to walk along all the links of the chain. Then. wipe all the teeth and washers with a napkin soaked in kerosene. (Never use gasoline: it can cause rust!)

And, of course, the main culprit of bicycle scrolling. the chain. requires special attention. There are several mandatory procedures for caring for it: 1. Flushing. It is advisable to rinse the chain and clean the links from adhering dirt after each ride, especially in autumn and spring. You can pre-stock kerosene, white spirit, or any other cleaning agent. Before applying the cleaner, the chain must be cleaned of dirt by thoroughly rinsing it in a separate container.

Lubrication. A clean chain must be thoroughly lubricated. You can use for this both liquid or thick lubricants in oil cans, and aerosol products.

How To Repair A Broken Chain – What To Do When Your Chain Snaps

It is better to choose a more expensive and better quality lubricant. Ideal, for example, a thick composition “Litol 24”, which does not allow water and bulky dirt spots to pass through.

With timely care of the chain and other parts of the driving bicycle mechanism, there is a chance that the pedals will begin to spin only after many years of use of each part.

Children’s bicycle chain breaks | How to fix a chain

Children’s bicycle chain breaks | How to fix a chain

Often asked how to fix a chain on a children’s bike? This is a common and common problem especially in children’s bicycles.

How to Fix a Broken Bicycle Chain

What to do if the chain on a child’s bike breaks?

You can bring your bike to our bike workshop or fix it yourself.

If you decide to repair the bike on your own.

How to fix a chain on a kid’s bike?

broken, bike, chain

To do this, you need to remove the chain protection if it prevents you from reaching the sprockets. Put the chain on the sprockets and connect it, from the frame side, using the chain lock, which has two guides.

Then slide the plate onto these guides.

And using a screwdriver or pliers, put the lock on the rails until it clicks. It should fall into the grooves and not dangle.

After you have installed the lock, check the “slack” of the chain, to do this, press your finger on the chain, if it is pressed tightly and tightly tightened, you should slightly loosen it. Just unscrew the right bolt that holds the wheel (this usually requires a 17 wrench, if the attachment wheels are not installed, if they are installed, you also need a 15 wrench), press your finger on the chain and tighten the bolt. The chain should “sag” no more than 0.5 cm.

broken, bike, chain

If the chain was in the sand, first, it is better to clean and wash it, and after installation, lubricate it (how to wash the chain and how to lubricate the chain). Install chain protection and go)

The chain on the bike jumps off. Why is it dangerous?

If the chain comes loose on the bike, it can lead to a number of dangers. To begin with, if you are still using an old type bicycle with a brake sleeve, then if you lose the chain, you are left without brakes. The chain jumps off at inopportune moments, when there is a lot of shaking or there is a lot of acceleration. As a rule, these are the moments when the cyclist flies downhill. Accordingly, the loss of brakes is very undesirable here.

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If the chain came off on a bicycle at speeds, then there is no such danger as on the old road with brake bushings. You have hand brakes that have nothing to do with the chain drive. But there is another danger. Without the presence of a hitch with the rear wheel due to the slipping off the chain, the drive front sprocket with connecting rods begins to rotate freely with the carriage. This freedom makes movement very difficult. An inexperienced cyclist may lose balance or a foot may fall off the pedal. Returning to the fact that the chain most often flies under heavy traffic and high speeds, such a loss of the pedal will cause serious injury. In this case, it is much easier to solve the situation if you have clipless pedals or good spike treadlers installed.

Another unpleasant case is extreme skiing. If you are going through a difficult section or landing after a long flight, a loose chain can cause a very serious fall. Here the legs can also come off, since there will be no predictable load on the pedals, and the carriage can turn over several times from surprise. All this is dangerous.

Well, two cases that are dangerous for all types of riding are the physical loss of the chain somewhere on the track or the falling off the chain in the spokes or other moving parts of the bike. In the first case, you will need to go to look for a chain, because you won’t be able to go without it, and in the second one you can make a juicy cross-wheel.

The chain came off. What to do about it?

The drive chain is one of the most important parts of a modern bicycle. The chain drive has been used on all types of bicycles for a long time and has proven itself from the very best side. There were bicycles with belt drives and even with a cardan shaft, but it was the chain that received the most widespread use.

A bicycle chain has a number of advantages and disadvantages. And even if there are much fewer disadvantages than advantages, there is one very significant drawback. Often from a cyclist who is digging with a bicycle overturned in the middle of the road, you can hear. yokarny bogey, the chain has come off. This is a real attack that sooner or later any bike user will face and must be fought against.

Why does the chain jump off on a bicycle?

The bicycle chain often jumps off completely at an unpredictable moment, however, some dynamics of this process is available for analysis.

  • On all types of bicycles, the chain will jump off when it is too long. In theory, the bike should be fitted with the correct chain length by default. But during operation, the chain is stretched. Such a chain is no longer able to hold its position.
  • On high-speed bikes, the chain jumps off when there is a problem in setting the derailleurs or the derailleur foot is so worn out that it is not able to tension the chain with the required force. If the setting is lost, then the switch sometimes tries to throw the chain to the next gear, and if at this moment the chain does not “lie on the sprocket” completely, then it will come off.
  • Incorrectly constructed system. If you have chosen the wrong components, then such problems are quite predictable. For example, a carriage with a too long axle was bought and as a result, the system protrudes very far from the frame. In this case, the so-called chainline is broken. Due to this skew, the chain flies and wears out quickly.
  • Extreme skiing and untuned shifting system. If you suddenly feel like jumping on a bike, and you haven’t done anything with the transmission, then be prepared to periodically lose the chain on the go. To properly adapt the switching system, you need to add a chain damper to it, remove two of the three stars on the system and shorten the chain.
  • High wear of mechanisms and ingress of dirt / branches. This point is suppressed with point 1 and point 2, but differs in that in this case we are talking about excessive wear. In addition, we will also remember about excessive pollution. the cassette can collect so much debris, grass and branches that the chains will simply have nothing to catch on. Often this point is determined by the slippage of the chain on the cassette. The torsional force is so high that a worn tooth is no longer able to engage the chain roller so tightly.

How to fix a loose chain

In all cases, an individual approach is required. Most often, you need:

  • Assess chain wear and replace chain and transmission if high wear occurs. Please note that it is better to change the entire set at once. system or stars, chain and cassette.
  • Clean the entire system of dirt / debris and grease the chain. Eliminate link jam.
  • Tighten the chain to the required tension. Shorten the chain by a couple of links.
  • Align the chain-line, make sure the chain is of the correct length and check that the system can interoperate with the short / long foot.
  • Check the accuracy of the switch setting.
  • Install the chain guide for intensive riding.

The most dangerous combination is a chain jam. The chain falls into the space between the connecting rods / stars and the frame and does not come out from there under any pretext. The application of force only causes damage to the frame. In such cases, you need to very carefully look for the position in which the chain falls into the gap. Such a situation will surely come across. Do not pull the chain with great force. the chain itself will deteriorate and you can cause irreparable damage to the bike frame. There were times when a cyclist pulled the chain so hard that he literally sawed his frame. And the slightest damage leads to the formation of a crack.

Note that occasional chain bouncing is common on a bicycle. This is a regular mode of operation, if you will. But these cases must be precisely that very rare. If the chain jumps off twice per trip, then this is already an unacceptable boundary. In addition, a standard bike should ride over spines, rocks, and slide down slides on primers while keeping the chain in place. High to Medium Shaking / Movement is the standard setting. If there are constant deviations, then it’s time to start repairing.