The chain flew off
Let’s see why the chain flies. There are two options: either you have a bent sprocket on the system (the system is a front set of sprockets), or the speeds are poorly adjusted.
If you have a bent star on the system, in this case you can continue moving simply by switching to a different speed at which the star is not bent. But if you use all the speeds while driving, then in the future you will have to replace the bent star. If the system is collapsible, you will only be able to replace one damaged star. If the system is non-separable, you will have to change the entire system along with the connecting rod.
If everything is in order with the connecting rods (what is a connecting rod?), Then your speeds are poorly set. Each of the derailleurs, front and rear, have adjusting bolts that prevent the chain from going over extreme speeds. If they are incorrectly adjusted, then the chain will fly off. If the chain falls off the largest sprocket, then you need to screw in a bolt with an L index, which means low. the lightest gear.
It must be screwed in until the stars on the switch are parallel to the large star. The same from the reverse side: if your chain flies from the smallest sprocket, you need to screw in a bolt with the index H (high).
Screw it in until the switch is parallel to the seventh speed.
If at the front the chain falls from the small chain to the frame, then tighten the bolt low.
To properly adjust the bolt labeled low, you need to set the lightest speed on the bike and screw it until there is a gap of 1 mm between the inner derailleur frame and the chain.
If the chain falls from a large sprocket to the connecting rod, then screw in the high bolt.
To properly adjust the high bolt, you must set the bike to the highest speed and tighten it until there is a gap of 1 mm between the chain and the outer derailleur frame.
These were the most common reasons for chain failure. Now let’s talk about her breakup.
How to tension and adjust the chain on a bike
Today we will help you figure out what problems can arise with a bicycle chain and how to solve them. Mikhail Kucheev, one of the leaders of the project “Sam to Sebe Bicycle”, will tell you about everything in detail.
During your trip, you may experience the following with the chain
The chain broke
The most common cause of chain breaks is when shifting gears under load, such as when driving uphill. If a chain link breaks, it can either rivet or break. If the link is riveted, you can try riveting it back. You will need a chain puller to do this, so it’s best to carry it with you at all times. If the link is broken, it is necessary to remove it and the adjacent link. too, and rivet the chain using the same puller.
Putting the chain back on is easy. To do this, pull back the rear derailleur while loosening the chain and place it on the front sprocket.
Today you learned why the chain can fly off and break, as well as how to solve these two problems with your own hands.
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How to tighten the chain on a speed bike
Every cyclist, sooner or later, is faced with the problem of loosening the chain mechanism. This is due primarily to gear shifting, so it is absolutely impossible to avoid this problem. By the way, after installing a completely new part, it must be tightened after 2-3 runs. To check the tension level, just pull the chain with your fingers. In this case, the degree of pullback should not exceed 15 mm, but also should not be less than 10. These indicators are relevant for sports and ordinary bicycles.
- How to make a bike chain tensioner
- Which bike chain stabilizer is best
- DIY bike chain caliper
- How to install a chain damper on your bike
- Video. How to chain a bike
So, what you need to do to tighten the chain on the bike:
To tension the chain on a regular bike, you need to put the bike upside down, that is, with the wheels up, and slightly unscrew the fastening nuts on the rear wheel.
Collapsible chains are placed on a regular bicycle without speeds; they have a lock on one of the links. Most modern speed bikes use non-separable chains with all the links riveted equally well. It is not difficult to disassemble a one-piece riveted chain, it is enough just to grind the heads of the pins on one of its links on emery. It is even easier and more accurate to disconnect the rivets using a special tool. squeeze.
It should be noted that pomace is a versatile tool. With its help, you can not only squeeze out the locking pin, but also re-rivet the disassembled chain. Many squeezes have two working grooves: one is needed for pressing the pin out of the roller, and the other is for pressing it in. A mounting location farther from the pressure screw is for ripping the chain pins. You can learn more about using such a tool in the following video.
DIY bike chain caliper
The tensioner can be made in a variety of ways. The simplest one is made from a regular bicycle spoke using pliers. Let’s just say that this is an old-fashioned version that does not look very nice, but is used by many. So the spoke is bent into a spiral and placed on the transmission. The spiral must necessarily pull back the chain.
Another, the simplest manufacturing method, can be considered a tensioner made of an aluminum or duralumin plate. It is easy enough to make it from the material at hand, so you need the following to work:
- aluminum or duralumin plate with a thickness of 8 to 11 mm;
- hacksaw and vice;
- technical oil;
- file and core;
- drill or drilling machine;
- hammer and drills;
- tap measuring M101 and its holders.
With the help of a marker, an old part is outlined on a metal blank, called a rooster, after which the central part of the hole is drilled. Further, the workpiece is sawn off as much as possible with a hacksaw and the external shape is brought to an ideal state with a file. Instead of a dropout, you can make a groove along the diameter of the shaft, which is subsequently inserted into the groove of the rooster. In the place where the rooster is installed in the frame, a difference is made in width. Its width on a thin section should be 4 mm, and on a thick one. 8 mm.
The hole can now be drilled out completely. Please note that the diameter of the drill should be slightly smaller than the diameter of the hole. Especially if the metal is soft. It is best to use an electric drill, as a hand drill does not provide perfect accuracy. Then the thread is cut with forward-return movements.
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Adjusting the chain tension in bicycles at speeds
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.
How to make a bike chain tensioner
To save even a little, you can make a bike chain tensioner yourself. But first of all, you need to understand why you need a chain damper (aka tensioner) on a bicycle. This accessory is a protective element for bicycles. Thanks to the damper, the tension level of the chain mechanism is regulated in order to exclude the reduction of oscillation when overcoming obstacles (jumping on stones, rails, etc.). In addition, the tensioner provides protection against mechanical damage and chain slipping off the sprockets. A damper is used on bicycles with a single speed or internal shifting mechanism.
Reasons for loosening chains
Before you begin to tighten the chain, it is important to understand one truth. It’s just as bad for a bicycle when the chain is too tight, as it is when the chain is too tight. The surest way to check the chain tension is to push it from top to bottom, while the normal level of sagging should not be more than 1-1.5 cm.If this value is far beyond its limits, the chain system must be tightened.
Another symptom that should alert the driver is if the chain began to slip.
To begin with, the problem of sagging is most often encountered by owners of regular single-speed bicycles. The thing is that here the chain is not able to tension automatically, as in mountain or other similar types of bicycles.
But why do the chains start to sag? There are two reasons for this. Firstly, any chain has the ability to stretch, despite the fact that it is made of metal. At the same time, cheaper options stretch more, but expensive branded products practically do not have this property.
Secondly, the chain system can weaken if the rear wheel nuts were not tightened well, in this situation, under load, it shifts slightly forward and the tension of the chain mechanism weakens.
Improper chain maintenance is the cause of an accident
In the event of a collapse or breakage of the bicycle chain, with the best outcome, the driver will get off with the fact that he will not be able to go further. But often with this there are more serious consequences. For example, if there is no special guard on the rear wheel, the chain can fall into the spokes, but here the outcome is unfavorable in all cases. Under any coincidence, the spokes of the rear wheel will be bent, and an eight will form on it, and the repair of such a breakdown will take a pretty penny. And there is also a danger that the driver will injure himself or pedestrians, as his rear wheel will jam.
White plastic guard prevents the chain from entering the spokes
The next danger in the event of chain breakage or loosening applies to those bicycles that do not have a handbrake. Since here the entire braking system is located in the rear wheel carriage, therefore, the driver will no longer be able to brake in the usual way. It’s even scary to imagine if this happens at high speed.
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Learning to adjust the chain drive correctly
On the simplest single gear bike, tensioning the chain is all it takes with one wrench, just loosen the two rear wheel nuts. Most often, this is a key of either 17 or 15, first you need to turn the bike upside down, and then slightly loosen the two nuts on the rear wheel. It is not necessary to unscrew them completely. After the nuts have been loosened, the wheel must be moved back a little. At the same time, there is no need to hammer in various wedges and insert something between the frame and the wheel, the tension of the chain system should occur with minimal effort, under the wheel’s own weight.
After that, the nuts can be tightened, it is best to use a wrench with a dynamometer for this, so that the correct tightening torque is observed. If the nuts are loosely tightened, the wheel may slip sideways on the road. And if you have a lot of forces, you can rip off the thread of the nut or even the wheel axle.
Attention! Tighten the nuts gradually, while observing that the wheel is clearly in the center of the fork. Otherwise, the sprockets will be in a different plane, which will lead to the chain collapse.
How to properly tension your bike chain and why it matters
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.
What to do if the chain is loose on a mountain bike?
If you encounter the problem of chain sagging on a mountain bike or any other that has several gears, then in such a situation it is changed. The fact is that in such bicycles, the machine is responsible for the chain tension. With the help of a spring, it constantly and automatically corrects the tension in the chain mechanism.
To save money, some craftsmen “cut” the chain, that is, cut it and reduce the number of links. In this case, the links are connected with a special lock. Of course, this option is also possible, but it is important to understand that a stretched chain is a worn out mechanism and it will not last long.
When buying new chains, it is important to know that they are different and may not fit your faithful two-wheeled friend. First of all, you need to make sure what chain pitch is used on your bike model. And you also need to decide on its length, which is usually measured in the number of links.
How to take care of chains
Like any other mechanism, the chain system needs maintenance. All you have to do is lubricate all the links thoroughly from time to time. In the case of rust formation, the metal becomes thinner, in addition, the link rollers become jammed, and the resource of the device is sharply reduced.
It is also important to know that during operation, the elements of the chain system run in to each other. At the same time, various cavities, notches and other minor defects are formed, which, as strange as it may sound, ensure the stability of the system. If the chain is removed, and then put in a different way, as it walked before, or even turned over, accelerated wear will occur. In the worst case, it is also possible to increase the frequency of chain rally. The chain system also wears out quickly if pulled too tight.
Choosing a chain damper
In addition to the installation type, tensioners differ from each other:
- degree of protection;
- on the basis of the material;
The dampers are made of high quality metal and plastic. The cost of the tensioner directly depends on the material used.
Reasons for the chain rally
The mechanism fails in two cases:
- Bending of a star on the system (front group of stars). In this case, it is possible to drive at a different speed, where there is no bent star. When using all speeds, it is strongly recommended to replace the damaged part soon. In a collapsible system, only one bent star is replaced. Continuous system assumes complete replacement of the system along with the connecting rod.
- With incorrectly set speeds. After making sure that the connecting rods are in good working order, it is advisable to tune the speeds. The high-speed derailleurs (front and rear) are supplemented at the top with adjusting bolts to prevent over-the-top transmission. If the adjustment is incorrect, there is a high likelihood of chain failure. If the mechanism flew off the main large sprocket, the L-bolt is screwed in (low implies easy transmission). It is screwed in to the parallel position of the stars on the switch of a relatively large star. By analogy, in the reverse order from the smallest sprocket, the H-bolt (high. high gear) is screwed in to the parallel mowing line of the 7th speed switch.
If the front part of the chain with a small chain sags, the L-bolt should be tightened to the bike frame, the correct adjustment of which directly depends on the setting of the minimum speed on the bike. Screwing in continues until the distance from the inner chain of the derailleur to the chain is reduced to 1 mm. In case of serious damage and excessive wear, the chain must be replaced.
Provided that the chain falls off a large sprocket, the H-bolt is screwed in, the adjustment of which is supposed to be at the highest speed. Tightens up to 1 mm distance from chain to outer frame of derailleur.
Bend the bicycle spoke with a spiral and place it on the transmission. It is necessary for the spiral to pull back on the bike chain. This is an old and uncomplicated method, where the pacifier does not look very aesthetically pleasing.
Break of the chain
If you switch the speed at the moment of load, for example, when climbing a mountain, a chain break is likely. When a chain break occurs, the link is often riveted or broken. If riveting occurs, you can try riveting the link again. Since this is done with a chain puller, it is advisable to keep the tool close at hand. If a link breaks down, it must be removed together with the adjacent one. Then the chain is riveted with a puller.
Installing the bike chain is a simple job. It is enough to pull back the rear derailleur itself on the weakened chain and put it directly on the front sprocket.
To tighten the chain on a regular bike, you need to set the transport with the wheels up. This is the most comfortable position for loosening the rear wheel nuts. When unwinding, it is easy to set the optimal sag and tension of the bike chain. You need to move the wheel along the grooves. The mechanism is fastened only in a parallel position of the axis relative to the carriage shaft. The correct slack is 5 mm. When tightening the chain, there is a difficult rotation of the pedals. Insufficient tension will cause the mechanism to kick off. Sometimes there is a tight stop of the wheel in the edges of the grooves and the extra links are removed.
Find your sport
Chain loosening is a familiar phenomenon to all bicycle owners. Mainly the chain is loosened due to gear changes. When installing a new mechanism, it is necessary to tighten the chain after 2-3 rides on the bike. Check the tension level by pulling the chain with fingers from 10 to 15 mm.
Steps for adjusting the rear derailleur on a speed bike.
Further, it transcends the adjustment of the chain tensioner, if any. To do this, place the chain on the smallest front sprocket and the rear on the largest. Then we pedal back, if the upper roller of the rear derailleur touches the teeth of the sprocket, then it is necessary to turn the adjusting screw to achieve such a value so that the roller is at a distance of about 5 mm from the teeth of the sprocket. Then we need to check the chain tension, only now we need to switch to the small rear sprocket.
Speed bike rear derailleur setting. self-adjusting bike speeds
Nowadays, the market for bicycles is amazing with a variety of rear derailleurs for bicycles, they come from the entry level to the pros. But, in spite of this, the setting of the rear derailleur has approximately the same principle of adjustment. Nearly all modern rear derailleurs have 5 adjustments.
- cable fastener, screw or nut
- adjusting drum
- limiting screw L (low). for adjusting small gears (large sprockets)
- limiting screw H (high). for adjusting large gears (small sprockets)
- chain tensioner adjusting screw
On different models of rear derailleurs, the L and H adjustment stop screws may be on the side or back. It should also be remembered that you can also adjust the rear derailleur using the adjusting drum, which is located on almost all shifters. This is very convenient because the cables tend to stretch.
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Preparing to adjust the rear derailleur
Before setting up the rear derailleur, it is necessary to clean the main elements that are included in the gearshift system.
It is required to clean the cassette from dirt, the rear derailleur itself, check the cable shirts, and it is also advisable to lubricate them if necessary.
If, after completing all the steps, you cannot clearly adjust the rear derailleur of the bike, then most likely the rear derailleur needs repair or replacement.
Perhaps the lever is bent due to falls or other circumstances, you can try to repair the rear derailleur by aligning the lever.
Not clear switching can also be due to a cassette not working properly, various deformations, distortions. Also, the cause of a fuzzy shift may be hidden in a dirty cable or a malfunction of the shift lever. After the correct setting of the rear derailleur, you can proceed to the speed bike front derailleur setting.
How to install a chain damper on your bike
- It is immediately necessary to remove the connecting rods and sprockets. In some cases, the carriage.
- The largest sprocket needs to be moved to the place of the middle one, and rockring is installed on the large section (part of the damper).
- The so-called “banana” is screwed to the extreme protrusions of the carriage.
- Bolts are tightened.
- The correctness of the installation is checked: if the travel of the suspension, which has 6 inches, is reversed at 12 o’clock, and at a different value at 11:30, then everything is installed correctly. Note that in the folded position of the suspension the chain may touch the groove slightly.
- After checking, a little thread lock is digged into the fasteners.
- Then the connecting rods are mounted, the chain is put on, and the rollers for the pressure are adjusted. Please note that the grooves must be located exclusively in the center.
- The inner “pancake” is extended to the star so that the distance between all similar elements is strictly proportional. The chain cannot touch parts.
- Bolts are fastened.
In what order the vehicles will pass the intersection?
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