Bicycle shifters: design, types, repair
The gearshift system on a bicycle in mass production has appeared relatively recently. It was used mainly for the manufacture of sports bikes.
The vast majority of the population was content with single-speed bicycles. Times go by, and the situation has changed exactly the opposite. Singlespeeds on city streets are becoming a rarity.
Types of shifters
In the old days, coins were used to feed the cable “by eye” and fix it by tightening the nut.
Today, the technology has improved somewhat: they began to install ratchets, and the process itself was called index.
Grip shift (rotating handle). The cable tension drum in such shifters is installed on the rudder tube and rotates around this axis. By rotating the drum forward or backward, the tension of the cable changes.
In the center there is an indicator of the set speed, some other models are equipped with a special remote display with an arrow.
Such models have a number of advantages: the integrity of the device, there are no unnecessary elements, excellent response to any number of gears and physically easy shifting (great for children and women). The main disadvantages of this design are random gear changes and a decrease in the convenience of grips.
Triggers. This shifter does not need to be twisted, it is equipped with one or two levers for gear shifting: one for increasing, the other for decreasing the gear. Switches the speed in steps, i.e. one push of the lever. one gear change.
The advantages of this design include: intuitive control over gear shifting, no accidental shifting, as in cases with grips, and no inconvenience of using grips.
The disadvantages are the fragility of the levers, the problem of quick shifting to 2-3 gears (delayed operation) and incorrect alignment with the handbrake levers (they can interfere with each other).
Dual Control is a development from the Japanese company Shimano. This drive combines two devices: brakes and shifters.
This drive device works in two planes: in the direction relative to the movement of the bicycle. it works as a brake, and in the perpendicular direction. it controls gear shifting.
Significantly different from the outside. By its appearance, it may not be detected at all (it looks like a regular brake sleeve). And the fact is that gear shifting occurs not by throwing the chain to another sprocket, but by changing the gear ratio inside this device.
The principle of operation of the internal switch, if you do not go into technical nuances, is similar to the operation of a gearbox in a car.
This switch is very comfortable for driving, and is not afraid of aggressive external environment, because absolutely protected. Also, the advantages of the internal switch include its property that you can switch it as you like and whenever you like: from 8th to 1st, from 2nd to 7th, whether the bike is in motion or not. this switch does not care.
Of the minuses of this device, they note the heavy weight, the impossibility of repair and, of course, the price.
How to independently replace and sort out the shifters on the steering wheel?
What you need to consider when replacing the shifters on the steering wheel, discussed in the previous section, so that the release of the cable corresponds to the shift step on the rear cassette.
To remove the shifter from the handlebars
- First you need to put the shifter in the lowest gear.
- Unscrew the cable plug and disconnect it. bite off the end of the cable carefully so that the latter does not fluff.
If this still happened, then the tip should be degreased and soldered with a soldering iron.
- Remove the grip from the steering wheel.
- Loosen the bumper lock and remove it.
Installation of the shifter on the steering wheel is carried out in the reverse order.
If the coin is dismantled for cleaning, then the shifter should be partially disassembled.
- To do this, it is enough to remove the shifting lever cover by unscrewing the fastening bolts.
- Unscrew the nut from the drive drum and disconnect the levers.
Do not forget that the structure is equipped with a spring, and before removing the lever, the spring must be relieved.
- There will be a ratchet drum under the levers.
You should not disassemble further, since this is enough for cleaning and lubricating the main components.
Bicycle handlebar shifters. description
The shifter is the external feature that distinguishes a multi-speed bike from a single-speed bike. At the beginning of their development, they were installed on the bike frame, now, for the convenience of cyclists, they are placed on the steering wheel. Their professional name is shifters.
If the bike is equipped with two speed switches, then two shifters are installed on the handlebars: one, for operating the front derailleur, is usually mounted on the left handlebar handle, and for the rear derailleur, on the right.
How to set up your bike’s derailleurs
Every cyclist sooner or later faces the problem of poor gear shifting on a bicycle.
There may be several reasons for this. damaged cables or dirty shirts, a stretched chain, poorly tuned front or rear derailleurs. It is the latter circumstance that most critically affects the quality of gear shifting on a bicycle and can turn your ride into a continuous torment.
Many beginners rely on experienced mechanics for this procedure. This is the correct approach. But over time, you realize that you need to learn how to independently make the specified setting. This will not only help to save a certain amount of money on the services of a bicycle mechanic, but will allow you to independently, at any time, adjust the speeds, ensuring the perfect gear shifting of the bike throughout the entire trip. This text provides specific steps that even a beginner cyclist can follow to adjust the speed of his bike on his own.
Rear derailleur setting.
The first thing to start with the adjustment is an external examination of the rear overhang. It is necessary to make sure that the gear shift cable is securely attached and supplied, its integrity, cleanliness and no wear of the upper and lower derailleur rollers. And also, the flatness of the foot, which during the operation of the bicycle can deform when falling.
It is very easy to check the foot evenness. you need to look at the rear of the derailleur and make sure that the corresponding cassette or ratchet sprocket, as well as the upper and lower roller of the derailleur, are on the same mowing line, perpendicular to the ground. If all of the above conditions are met, you can safely proceed to setting.
How to repair stucked indicator switch in zeero cost
It is necessary to set the chain to the minimum rear sprocket, correspondingly turning on the maximum reverse speed on the bike. To carry out the adjustment, both the front and rear overhangs have two adjusting screws on their body, denoted by the letters H and L (High and Low, respectively). Since at the beginning of the adjustment, the chain was set to the maximum gear at the rear, for adjustment you need exactly the screw with the letter H, which is responsible for adjusting the high speeds. Rotating it clockwise or counterclockwise, they achieve such a position of the switch foot so that both of its rollers stand strictly on the same mowing line with the smallest back sprocket. After that, it is necessary to engage the minimum reverse gear, in which the chain is on the largest sprocket at the back. And with another screw, which is designated by the letter L, make an identical adjustment before aligning the rollers with a large sprocket.
Sometimes a situation arises when, after correct and careful tuning and adjustment of the rear derailleur, a problem arises when shifting into high or low gears is poor. This is due to a strong or weak tension in the gear shift cable. This adjustment can be done in two ways. a special regulator on the rear derailleur, or a regulator on the gear shift knob (shifter). Which of the options is used on a particular bike depends on the level of equipment set by the manufacturer. If the chain is thrown poorly into lower gears, the tension of the cable should be increased, and if the chain is dropped to higher gears, on the contrary, it should be reduced.
There is another adjustment option on the middle and high level rear crossovers. distance of the idler roller (top) to the cassette stars (chain tensioner adjustment). It is produced as follows. The chain is installed on the largest sprocket at the back and the largest at the front. In this position, the rear derailleur foot will be pulled to the maximum. And with the adjusting screw, you need to achieve a distance of approximately 5mm from the top roller to the sprocket teeth. It is at this distance that the smoothest and most precise gear shifting is achieved. It is not worth reducing it, as there may be a risk of grazing the roller by the sprocket teeth and damage it.
Front derailleur setting.
Before adjusting the front bumper, the first step is to make sure it is correctly positioned on the bike frame. For beginners, there are two recommendations. The first is to make sure that when you engage the largest chainring at the front, its teeth are at a short distance from the bend of the derailleur frame, as well as at the same distance from it. At the same time, in no case should they touch the frame or, on the contrary, be far from it.
The second is the parallelism of the switch frame to all the stars in the horizontal plane. That is, if you look at the switch from above, then its frame should be parallel to the stars of the system.
You need to start the adjustment by setting the chain to the minimum front and maximum rear sprocket. Next, you need to unscrew the bolt that fixes the cable to the switch housing. After that, it will take its natural position and you can proceed directly to the setting. Turning the screw marked L (Low) in different directions, you need to set the gap between the chain and the switch frame in the region of 1-2 mm. It is this distance that will ensure perfect shifting, and also eliminate the possibility of chain friction on the derailleur frame during driving. After that, it is necessary to fix the shift cable with a slight interference, making sure that it lies in the required groove in the clamping area. With the chain set to the maximum chainring and minimum sprocket, adjust the adjusting screw marked H in the same way until the minimum clearance is found between the chain on the large chainring and the derailleur frame. If, after carrying out the above procedure, difficulties arise with the inclusion of low or high forward speeds, it is worth adjusting the tension of the shift cable, similar to setting the rear derailleur.
Having mastered both types of speed adjustment on a bicycle as quickly as possible, you will protect yourself from unpleasant surprises that may arise during the ride, having the opportunity to make the necessary adjustments at any time, spending a minimum of time and effort.
Setting the switches
Derailleurs on a bicycle are divided into front and rear. It is the rear ones that are most damaged when driving, so it is recommended to adjust them first. The process itself will be long, since there are more stars here than in the front derailleur.
[attention type = yellow] Important! It is necessary to proceed to setting the speeds on the bike only after all other parts have been checked for serviceability. [/ Attention]
The main configuration steps are now complete. The only thing left for the cyclist is to adjust the shifting accuracy. The procedure will get more complicated depending on the number of stars used.
The chain is installed on the stars as follows: in front. on the smallest, on the back. on the largest. After that, the tension screw is tightened until the roller is as close as possible to the cassette. He should not rub against the cassette.
A similar procedure is carried out with the chain, which is then installed on the largest chainring and the smallest rear chainring.
You will need to adjust the speeds until the chain begins to smoothly and freely change from one speed to another. If, when changing the speed, problems begin (difficult move, the chain flies, and so on), then the cable is tensioned using the adjusting bolt to the desired position.
ON OFF ebike Switch Handlebar Mount installed tested
After the manipulations with the settings are completed, the system is checked using a check-in, where the recommended gear ratios will be used. Adjustment is a standard procedure on any speed bike, as the tension in the cables will loosen over time. Therefore, setting speeds is often a planned activity that does not require replacement of parts.
What can affect the quality of the switches
It is important to find out what caused the problem.
How to fix defects
The rooster is the bracket to which the switch is attached. This is a known weak link, because when the switch hits the ground, it is this component that will be damaged, and the frame will remain intact, which is much more important.
By the way, there are switches that are attached to the hub axle. The mechanical strength of the system is higher, but this only applies to extreme equipment.
Titanium frames are made with fixed roosters, as the material itself is strong. Interestingly, in English it sounds like Derailleur hangar. We also have the name rooster because of the scallop at the end.
Detachable shanks are mounted on carbon and aluminum frames. This component is cast from a large carbon aluminum alloy. Durability is low.
If the rooster is bent, then it is better not to straighten it. It will crack anyway.
Roosters have different geometry. Please be careful before purchasing. On cycling trips, participants take spare roosters with them. And usually one bike is enough for two. They do not break very often.
By the way, if the rooster still broke, and you want to ride, then you can make a single speed:
- To do this, take a squeeze.
- We press out one of the pins. It doesn’t have to be a connector pin. He is thicker than the others. You must press out the pin in such a way that it does not fall out, but remains in the link. It is best to unwind to the end and check how much the pin came out.
- Now we shorten the chain to the desired size. It is better to advance the rear wheel forward in advance. We measure, squeeze out the excess links completely. By the way, the old chain is replaced with a new one in the same way.
- We install the chain in the squeeze with the back side. We press until the pin clicks. You can skip this click. Be careful, otherwise the pin will go further than necessary.
- It is much more convenient to use a connecting pin, the long rod of which is fixed in the links, and the excess is removed with pliers.
- Now we move the wheel, so the chain will stretch a little.
Setting up your bike derailleurs is easy. You do not need to have special skills and knowledge for this. Follow the instructions and you will succeed!
Instructions for adjusting the derailleur on a bicycle Link to main publication
Rooster bent or broke
If the foot of the rear derailleur is oblique, then the mount is bent. You can fix this defect yourself.
How to fine-tune the rear derailleur
The most important factor when adjusting a switch is accuracy. You can fine-tune it as described at the beginning of the article, but during implementation you need to pay special attention not only to the adjusting screws, but also to the entire mechanism as a whole.
That is, when setting up, you need to monitor the state of the tension of the chain and cables, the position of the rollers, etc., since with fine tuning they can go to the side, which will delay the repair time for some time.
BIKE SPEED SELECTOR: HOW TO SET UP AND SWITCH CORRECTLY
Bicycle gearshift is a transmission component that directly serves to shift gears. Correct speed control is an important part of a comprehensive approach to cycling comfortably and safely. Next, let’s talk about why you need a speed switch on a bicycle, what types there are, how to set up and how to switch speeds correctly on a bicycle.
EXTERNAL SWITCHING MECHANISM
These derailleurs are used much more frequently on bicycles. Gear shifting takes place using two switches: rear and front. Let’s consider each of them in more detail.
Its design allows you to transfer the chain from one to the other on the chainrings. It works like this: inside there is a moving frame through which the chain passes.
When you need to switch the speed, this frame moves (it becomes above the desired star) and, accordingly, moves to the chain star.
There are several parameters in which the front derailleurs differ:
- There are several ways to attach them to the frame. The first method is to use cable ties to attach the switch. You can also use the second method (especially for frames with non-standard geometry). clamp the plate that holds the switch with a cartridge or carriage.
- Also, there may be different angles of installation of the switch relative to the frame (you should select this parameter correctly and accurately so that you can correctly change gears).
- Another parameter that may differ is how the cable is attached. It can be connected to the switch from above or below (there are models that have both connection methods in their design).
For all front derailleurs, it is not possible to swing the chain under load. Of course, almost all manufacturers are trying to find a solution, but emerging systems are expensive and often ineffective.
It does the same job as the front one, but it has more stars (up to nine), and there is also a special frame in its design that provides chain tension.
Such switches also differ in certain characteristics:
- Rear derailleur for each type of bike.
- Fixed size of the largest star.
- Different cable lengthening when moving the switch (its pitch).
- Switch capacity (difference between the size of the largest and smallest stars).
- Traction type (forward or reverse thrust).
- Mounting type (with a rooster or directly to the frame).
- simple construction;
- little weight;
- small price;
- the number of gears such switches have a lot.
- strong influence of external factors;
- heavy chain wear;
- frequent switch maintenance;
- a high probability of breakdown if the cyclist falls;
- gear shifting is not possible if the bike is stationary.
HOW TO SET THE REAR SWITCH
First you need to make sure it is not bent (the chain tensioner is parallel to the cassette stars). Now let’s start adjusting.
At high speed, the chain should be on the small star of the cassette. We put everything in this position. To adjust, we need to find two screws (in the figure they are indicated by H and L).
Screw H must be tightened so that the derailleur roller is aligned with the line with the small star. In the same way, screw L should be tightened. the roller should align with the large sprocket.
After that, we pull the cable (the maximum speed is on the shifter). It should fit exactly into the groove near the fixing bolt (number one in the picture). Now it should be tightened.
We fasten the cable with a stretch. Check if high gears engage well. If not, loosen the cable with the adjuster (marked with number two). Also check if the speeds are reset well (if it is bad, then tighten the cable while unscrewing the tension adjuster).
The final step in adjusting the rear derailleur will be to set the smoothness when shifting gears. To do this, you need to put the chain on a small star in the front and a large one in the back.
The tension screw (marked with number three) should be tightened so that the top roller on the rear derailleur is as close as possible to the star, but does not touch it.
Now put the chain the other way around (in the front on a large sprocket, and at the back on a small one). the roller should not touch the cassette sprocket either.
How to properly shift gears on a bike?
Gear shifting rules are simple and not so numerous:
- You only need to switch when the bike is moving. If you don’t pedal, nothing will happen.
- When switching, the load on the bike chain should not be too large. Switching should be smooth and smooth.
- Do not switch uphill. The speed must be set in advance.
- Correct speed change is a step change, i.e. one speed at a time. It will save the chain and nerves.
- If you have a classic system (3×8), then each chainring has its own personal rear chainring. This will prevent chain distortions.
The large chainring is used for cruising. Average is needed for poor asphalt, dirt roads, etc. The small sprocket is invaluable for steep climbs, when driving on sand, long grass, etc.
Gear shifting on a bicycle is a complex and organic system. It cannot be divided into separate elements: everything must correspond to each other, and then the bike will “fly”.
This type of derailleur is most commonly found on mountain bikes. Derailleurs are mounted on straight handlebars adjacent to the brake lever.
Some switches of this type are located on the top of the handlebars, while newer models are located on the bottom of the handlebars for easy positioning.
Older models usually have friction-based switches. That is, the rider must manually adjust the cable tension by pushing up or down. Newer models have slots in which each press accesses a specific gear in the drivetrain.
The newest thumb switches also have a second index finger lever. Some switches of this type are integrated into the brake lever.
Curved handlebar combination switches
The road bike combination brake and shift lever is the newest model in the evolution of bicycle gear. On uneven roads, the steering wheel, brake lever and shifter come together in one well-tuned mechanism, which reduces overall weight and shift times.
The gearshift lever is located directly behind the brake, while both levers move independently of each other and do not interfere with each other’s functionality. Each combo shifter must be set to match its assigned derailleurs and gear sets.
One of the disadvantages of this type of shifters is the use of overly specific components, which, in turn, are not interchangeable with other brands or even past models. If one of the switch components breaks down, it will have to be replaced completely.
Varieties of switches
There are 3 types of speed control devices for bicycles. Two of them are fundamentally different from each other, the third combines the characteristics of both shifters. Each option has its own advantages and disadvantages:
- External. It is the most common and can be installed on any bike model. The classic system consists of a pair of derailleurs. for the big and rear sprockets. The principle of operation lies in the mechanical movement of the chain, which occurs thanks to a special frame. Advantages of the device: reliability, ease of setup, maintenance, light weight, affordable cost. Cons: Exposure to weather conditions, increased chain wear, inability to change gears if the bike is not in motion.
- Internal or planetary. It resembles a conventional brake sleeve in appearance. The change of speeds is carried out not by throwing the chain from one sprocket to another, but by changing the gear ratios inside the device. The mechanism works in the same way as a car gearbox. Pros: protection from the external environment, the ability to switch from 7 to 2, from 1 to 5, regardless of whether the bike is riding or standing, ease of maintenance. Cons: strong knot friction, heavy weight.
Bicycle combo derailleurs, which are mounted on the handlebars, are a hybrid of external and internal devices. The model gives the user a lot more options. The advantages of such shifters include versatility, the ability to use regardless of the size of the stars. The disadvantages include not very convenient operation, high cost.
Currently, bicycle shifters are produced by many companies around the world. The best are 3 manufacturers:
- Shimano. Today, the products of this Japanese brand are most popular. It is distinguished by high functionality, quality of construction, durability and reliability. Bicycle mechanisms are made from durable materials using modern equipment. Sports shifters are presented in several series: Shimano Deore and Sram ESP 7.0 (have increased safety margin, light weight), Alivio, Sram ESP 5.0 and Sram ESP 4.0 (devices are slightly weaker than professional ones). For amateur riding, the Acera and Sram ESP 4.0 models are suitable. Products are unpretentious in operation, suitable for repair.
- Sram. An American brand that produces 10 different groups of equipment for bicycles: X.0 (professional grade shifters), X-9, X-7 (semi-professional grade), SX (attachments for bikes with 24-27 gears), 3.0 (models for beginners athletes).
- Microshift. Many cyclists find Shimano shifters too soft and Sram elements too stiff. The products of the Taiwanese brand will become the golden mean. The levers are located as conveniently as possible, gear shifting can be done with your thumb. Microshift TS50 is available for six- and seven-speed ratchets and cassettes, TS70, TS75 are optimal for bicycles with 8-9 sprockets.
- Rohloff. The company occupies a leading position in the complexity of mechanisms. Shifters include up to 14 planetary components. Models are characterized by a large number of gear ratios, high efficiency.
The listed companies have been working in the market for a long time and have a good reputation. The popularity of their products is due to the high quality, reliability, practicality of mechanisms.
Shimano Sram Microshift Rohloff
The principle of operation of the shifter
The cyclist transmits power to the shifters from the shifters via a cable drive. The switches, in turn, provide a change in the position of the chain on the stars and a change in the gear ratio. On models with two switches, the steering wheel is equipped with two shifters. Left hand forces the front mechanism, right hand forces the rear derailleur.
The device is present in the design of road, mountain, walking, cyclocross bicycles with more than one gear. The main manufacturers are SRAM, Campagnolo, Shimano. In some models, the shifters are combined into a single mechanism with a brake lever. This node in the environment of motorists is called an automaton.
Types of shifters
Trigger type shifter. The device is used in mountain and hybrid bicycles in the form of a block on the handlebars equipped with two levers. Internal ratchet mechanism provides precise gear shifting and cable tension fixation. The way to shift gears is by pressing the levers. Operational Benefits. Return of the shift lever to its original position. The function is useful for driving on terrain with difficult terrain. The largest manufacturer of trigger shifters. Shimano.
Grip shifter. A device of this type provides the ability to shift in any direction in one motion to several gears at once. Constructive form. revolving handle. Switching to the appropriate gear is made by turning a few clicks. Operational Benefits. Variable Lever Length. Largest manufacturer. SRAM.
Dual Control lever. The device is combined with a brake lever with two degrees of freedom. The area of use is road bikes. For braking, the handle is pushed towards itself, for gear shifting it is deflected up and down. The brake lever is rotated in a plane perpendicular to its stroke. Manufacturers. Shimano and Campagnolo.
Friction shifter. Obsolete design used on bicycles of past generations. The principle of operation is tension and loosening of the cable by pressing on the lever. The design feature is the lack of fixation of the shifter and holding it in the desired position by friction force. An improved version with a locking nut is currently being produced. Manufacturer. Shimano.
Bicycle shifter repair
A shifter is a device for shifting high-speed gears of a bicycle. Another name for the mechanism is shifter. The location in the bike structure is the handlebar (in modern models), the frame (in the models of previous generations). Constructive form. handle, lever.
A shifter is a device for shifting high-speed gears of a bicycle. Another name for the mechanism is shifter. The location in the bike structure is the handlebar (in modern models), the frame (in the models of previous generations). Constructive form. handle, lever.
Maintenance and repair of bicycle shifters
To ensure uninterrupted operation of the device and increase the operational life, it is necessary to regularly perform maintenance of the shifter. In case of wear or damage, the unit is replaced or repaired.
- Speed derailleur cable stretch
- Wire rope wear and looseness
- Failure toggle settings
- Ratchet wear
- Worn or broken torsion coil spring
Due to the low load on the unit, it is sufficient to carry out a complete bulkhead with new grease once every few years. This is a complex process that should be entrusted to specialists. With an independent bulkhead, an inexperienced master can make technical mistakes that will lead to the failure of the entire transmission system. For example, an incorrectly applied force can cause the thin plastic indicator of the current gear to break. Before disassembling the shifter, you must release the cable from the speed switch mount. Accordingly, after assembly, you will have to rebuild the correct tension. If a loose end of the cable is found, a new plug will need to be installed. If the working area is unbraided, the cable needs to be replaced.
During long-term use of the bicycle, the cable is subject to abrasion, dirt is inevitably clogged under its shirt. This affects the quality of high-speed gear shifting. In view of this, it is periodically necessary to thoroughly inspect the shirts and check for scuffs, jams and dirt, and, if necessary, replace the shirt.
Important! To lubricate the cable, it is necessary to select substances of a suitable consistency. When choosing a lubricant, it is advisable to consult a specialist.
Transmission repair steps
Repair includes adjusting the front and rear derailleurs, as well as checking the condition of the cables, chain, cassette and rollers.
- Unscrew the bolt holding the cable.
- Disassemble the shifter and remove the cable from it and from the shirts. Shirts are also recommended to be replaced!
- Clean shirts and put a drop of oil in them for better cable glide.
- Thread the new cable through the shifter and then into all shirts.
- Start configuring the switch.
- Bite off the excess part of the cable and secure the end with a special tip.
If you see that the teeth of the transfer rollers or cassettes have worn out, they must be replaced with new ones. Worn cassette or rollers rotate the chain, and the quality of gear shifting on the bike suffers greatly.
Over time, the chain deteriorates. It is recommended to keep several chains in stock and change them every 100 kilometers, because the wear of the chain will deteriorate the cassette. Multiple chains will wear out more slowly and your cassette will last longer. You can determine the state of the chain using a special tool. It is impossible to repair the chain, you just need to replace it if necessary.
If the chain is in good condition, simply remove it, clean and lubricate. Remove excess with a napkin or dry cloth.
It is important to set it up especially accurately, since if the adjustment is not good enough when switching speeds, the chain can fly off or even break. The sequence of your actions will be as follows:
Use the rear shifter to shift to the middle sprocket so that the chain is not too skewed.
Next, put the chain in first gear and unscrew the bolt securing the cable.
Use the screw “L” to move the transfer frame so that the distance from the chain to the switch on the left and right coincides.
Without too much tension, place the cable and secure with the bolt.
Switch to the biggest star in the front.
Tighten the screw “H” so that the chain is again exactly in the middle of the frame.
Check adjustment results and achieve maximum shifting accuracy with the thumb on the shifter.
If the shifter triggers are too tight, loosen the cable tension.
Make sure the cock is level first. If it is still bent, you can contact the service to straighten it, or try it yourself. Alternatively, you can simply replace it. For 2016, for roosters are only about 300-900 rubles. Do not even try to tune the derailleur with a bent cock, as the gear setting on the bike in this case will not work for you.!
Some firms produce the so-called cock guard, which is attached to the frame. Do not buy it under any circumstances! A rooster is a consumable component that can and should be replaced if it breaks. When hitting this very protection, the cock will remain intact, but the frame may crack. The frame is harder and more expensive to change.
When you are convinced that the rooster and the cable are in good condition, you can proceed to the actual setting.
Place the chain on the largest chainring in the front and the smallest in the back.
Remove the bolt that holds the rear crossover cable.
By rotating the bolt with the inscription “H” you need to make sure that the switch rollers lie in the same plane with the desired sprocket.
Then lightly stretch the cable and tighten the bolt holding it. Over-tensioning the cable will make the crossover difficult to work.
Shift the speed to the lowest (i.e. the largest star in the back and smallest in the front).
Rotate screw “L” until the derailleur rollers line up against the large sprocket.
Check if gear changes are good.
If shifting is not correct, use the thumbscrew on the shifter, which changes the cable tension.
Now that you have set up the rear derailleur, you are ready to adjust the front.
What to do if your bike’s derailleur is broken
Transmission components must be kept in good condition at all times, lubricating the chain promptly, adjusting switches and troubleshooting.
As the kilometers increase on the bike, individual parts wear out, and if maintenance is not performed on time, the part may become unusable altogether. In this article, we will look at the most common problem associated with speed derailleurs.
It must be understood that the speed changes only when the chain moves forward. If you jerked the shifter, then you need to rotate the pedal so that the chain spreads from one star to another. If, when switching, clicking or any other extraneous sounds are emitted, you need to adjust the switching.
The main reasons for inaccurate switching:
- The transfer cable is torn, stretched, or is on the verge of breaking.
- The switch itself is broken or the spring in it is worn out.
- The teeth of the rollers are worn down.
- Switch needs to be adjusted.
- The chain or cassette is worn out.
- A lot of dirt got into the chain.
Drive only at speeds that will not cause the chain to tilt too much. For example, you cannot set the speed to 1/8, 1/10, 3/1 (the first number is forward gear, the second is reverse), and so on. For the smallest front chainring, you can turn on 1–4 speeds at the rear, for the middle. 3–7, for the largest. 7. If you nevertheless put an incompatible gear, there will be a risk of chain jamming and spinning, as well as an increase in its wear rate.
On a speed bike, fast gear changes are very important, especially if you are competing. Transmission repairs should be carried out before the race, and then after, as aggressive driving can cause the shift adjustment to be out of order. If you do full maintenance of your bike at least once a season, it will serve you for a very long time.!