How to change the derailleur on a bicycle front

How to install the front derailleur on a bike yourself

Installation of the front derailer is carried out according to the following algorithm:

  • Secure your bike to a stand. This will greatly simplify the work;
  • Before installation, you must make sure that the mechanism is thoroughly washed, and the rubbing components are properly lubricated;
  • Fasten the bike chain: at the front at the minimum sprocket, and at the rear at the maximum;
  • Loosen the cable adjusting screw;
  • Slide the front derailleur clamp onto the seat tube;
  • Install the cable on the derailleur and tighten it;
  • Check the position of the frame when operating the gear selector. If there is a distortion, too large or small interval between the sprocket and the frames, the mechanism must be removed and reinstalled on the seat tube again;
  • Tighten the fixing screw.

Fit And Set Up A Bike’s Front Derailleur

Fastening method

There are 3 types of front derailer attachment:

Clamp fastening is considered the most common. In this case, there are 3 types of standards, depending on the thickness of the bicycle frame. Some derailleur modifications are equipped with special spacers so that they can be mounted on a bike with a smaller seat tube thickness. In addition, a distinction is made between front derailleurs with lower and upper collars.

Simple option for setting gear shifting.

  • I drove my first couple of hundred kilometers and felt that the switching reaction speed became lower due to the shrinkage of the sheath of the switching cable (shirt);
  • assembles the bike himself from the box.

This procedure can be performed on the go, just make sure that you do not hit anyone or crash into anything.

  • To begin with, reset the chain, using the shift lever on the steering wheel, to the smallest sprocket, if you have a numbered display system, to number 1;
  • Then, while riding, switch to the next one. If this does not happen immediately, but with a noticeable delay, unscrew the adjusting screw on the shifter body a little, just a little bit, about a quarter of a turn;
  • Switch to the next gear, if the problem persists. repeat everything described in the previous paragraph until the desired result is achieved;
  • If everything works as expected, switch to the largest star, then switch to the previous largest star. If switching occurs with a delay. screw in the adjusting screw on the shifter body by about a quarter of a turn;
  • Switch to the next gear, if the problem persists. repeat everything described in the previous paragraph until the desired result is achieved;
  • This method works for both the front derailleur and the rear derailleur. As you can see, you do not need to bend anything with your hands to restore the switching performance and this procedure can be carried out without any difficulties at any time.

Shimano Alivio

This line is already suitable for fairly serious hikes and amateur competitions, but the chain still hits the lower feather on bumps. A sort of fine line of transition between the amateur level and the professional one. The switching quality is already quite fast and accurate, plus work with cassettes of 8-9 stars. His reliability is also acceptable, but nevertheless this “edge” is felt and the transition is felt. The Alivio is ideal for those looking for frequent, non-aggressive riding in all weather conditions, without regularly adjusting the switch.

In the road range corresponds to the Shimano Sora group.

The principle of operation of the front derailleur

The main parts of a bicycle front derailer are.

  • Clamp for fixing the device to the bike frame;
  • End position adjustments (H, L);
  • Bolt-fixing of the guide frame and cable;
  • Parallelogram.

Shifting the speed of the bike by means of the shifter tightens or looses the cable. The cable is driven by means of a parallelogram (it is on it that the guide frame is fixed). The latter puts pressure on the chain on one side. outside or inside. and throws the bicycle chain onto the desired sprocket. As the speed decreases, the degree of tension in the cable decreases. With the help of a spring, the frame is biased to the bicycle frame, the chain is pushed onto a smaller sprocket. When the gear is increased, the cable is pulled. The frame is displaced in the direction away from the bike frame, and the chain is transferred to the chainring of the system with large dimensions.

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As you can see, the structure and functioning of the bike’s front derailleur is simple. Everything here is based on the usual mechanical stress. However, in order for the mechanism to work like a well-tuned clock, you need to choose a derailleur that is compatible with the given bike model.

Shimano derailleur

However, the shifter is a kind of “heart” of the transmission system and, for the most part, it is he who is responsible for the quality of gear shifting. Today, a limited number of companies are involved in the production of high-quality derailleurs, and the most popular among them is the Japanese giant. Shimano.

To make it more convenient for customers, all Shimano derailleurs are divided into groups. Let’s dwell on each of them in order:

  • Shimano Tourney is the easiest beginner derailleur. They are distinguished by their low cost and high reliability. Bicycles equipped with components of this class are designed to be used at a leisurely pace on the track or on tightly packed ground. This Shimano derailleur cell needs constant adjustment and starts to fail if too much dirt gets on it. Fits Shimano 2300 Road Group.
  • Shimano Altus / Acera is also the entry-level equipment. But Acera derailleurs are already installed on bicycles designed for use in sand and mud, naturally only at the amateur level. For those people who, for whatever reason, cannot get more expensive options and ride both on the ground and on asphalt, this type of Shimano derailleur is ideal. Fits Shimano Sora Road Group.
  • Shimano Alivio. This group of equipment is something in between, it cannot be called professional yet, but it is no longer amateur. Equipped with Alivio derailleurs, the bikes are great for recreational riders and cycling trips. This Shimano derailleur group is reliable and unpretentious. The price-performance ratio in this group of switches is implemented most successfully. Fits Shimano Tiagra Road Group.
  • Shimano Deore is a professional line of derailleurs, but if you look at things soberly, the differences from the Alivio are not so great. All that changes is the indicators of lightness and reliability, they get a little better, but the price rises significantly. Fits Shimano 105 Road Group.
  • Shimano Deore SLX and XT are lightweight and reliable professional equipment. The reliability of the Deore SLX / XT derailleurs is eloquently reflected in the cost: the price of a Shimano Alivio rear derailleur is about 45. and the Deore costs between 90 and 110. Ideal for professional athletes to train every day. Fits Road Groups. Shimano Ultegra and Ultegra Di2.
  • The Shimano Deore XTR is the ultimate racing equipment. Not afraid of any stress. Extremely expensive. Fits Shimano Dura-Ace Road Group.

Shimano doesn’t just make derailleurs for mountain and road bikes. There are many derailleurs available for touring, city and adventure bikes. But we do not consider them, since these bicycles are not popular in the CIS.

A modern multi-speed bike rear derailleur has up to 6 different adjustments. Consider them.

  • Shifter retaining bolt (not adjustment).
  • Control cable retaining bolt.
  • Hollow screw for adjusting the tension of the control cable.
  • Low gear stop screw (large sprocket, L).
  • High gear stop screw (small sprocket, H).
  • Screw for adjusting the position of the upper roller relative to the stars.

The tension of the cable can also be adjusted by the boss on the shifter, if you have one. Some gear derailleurs do not have all of the items listed. Shimano XTR derailleurs still have a parallelogram spring tension adjustment screw underneath.

Is it necessary to generalize something here? In my opinion, no. The choice of the switch is an individual matter for everyone, depending on the needs and financial capabilities. Don’t forget to check out the range of derailleurs. Shimano’s main competitor.

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Thank you for attention,
Alexey Evdokimov

Any cyclist should know how to switch speeds on a bicycle and how to adjust them. Just stick to some simple rules to make your cycling comfortable and efficient. Plus, your derailleurs will last longer and save you money.

When we were little, there was no trace of speed on the bike, and no one thought about it. We just pedaled and the bike just moved. But today the simplest model of a bicycle is necessarily equipped with a certain number of speeds and has two brakes. At the same time, many people think they know how to switch speeds on a bicycle. But, in fact, it is not as easy as it seems at first glance.

Shimano Deore LX / SLX

There is a double division here. Since 2009, Deore LX has been positioned as a travel equipment group. And the SLX is already aiming for racing.

Deore LX. here Accent is made for reliability and durability at the expense of weight. The most ideal option for tourists, the price is too high, but the reliability is high.

SLX. here the Accent is made for racing. Less weight, better spring stiffness, consistent accuracy and speed.

These switches can no longer be classified as budget switches. They are clearly not needed for simple pokatushek. Those who understand what they are paying for, but are not ready (or cannot) spend money on top-end Shimano derailleurs should take a closer look at them. Depending on whether you are a cyclist or a racer, you need to choose the appropriate line.

In the road range corresponds to the Shimano 105 group.

End position limiter

Locking devices

In some cases, you still need to loosen the front derailleur adjusting screw to improve gear shifting to a small sprocket. Because of this, the chain begins to jump off the sprocket, to prevent this, you can install a special device. a limiter. It attaches to the seat tube of the frame and physically prevents the chain from jumping off the system.

Simple option for setting gear shifting.

  • I drove my first couple of hundred kilometers and felt that the switching reaction speed became lower due to the shrinkage of the sheath of the switching cable (shirt);
  • assembles the bike himself from the box.

How to Shift the Front Derailleur

This procedure can be performed on the go, just make sure that you do not hit anyone or crash into anything.

change, derailleur, bicycle, front
  • To begin with, reset the chain, using the shift lever on the steering wheel, to the smallest sprocket, if you have a numbered display system, to number 1;
  • Then, while riding, switch to the next one. If this does not happen immediately, but with a noticeable delay, unscrew the adjusting screw on the shifter body a little, just a little bit, about a quarter of a turn;
  • Switch to the next gear, if the problem persists. repeat everything described in the previous paragraph until the desired result is achieved;
  • If everything works as expected, switch to the largest star, then switch to the previous largest star. If switching occurs with a delay. screw in the adjusting screw on the shifter body by about a quarter of a turn;
  • Switch to the next gear, if the problem persists. repeat everything described in the previous paragraph until the desired result is achieved;
  • This method works for both the front derailleur and the rear derailleur. As you can see, you do not need to bend anything with your hands to restore the switching performance and this procedure can be carried out without any difficulties at any time.

Adjusting the front derailleur of the bike

The bike’s front derailleur is adjusted only after the rear derailleur is set, because the setting of the front derailleur is influenced by the position of the chain on the cassette (it should be possible to shift reverse gears). Setting up the front derailleur requires a good eye and a little patience. Before adjusting, it should be well cleaned and lubricated its moving parts.

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But even with a good tuning of the front derailleur, there is no guarantee that it will shift gears clearly. This is due to the nature of his work, he switches the circuit at the top when it is energized. For a clear gear change on the system, slow down the pace of pedaling during shifting.

How to remove the front derailleur on a bicycle

Low gears (small star (L))

When setting the end of your bike’s front derailleur, set the chain to the small sprocket at the front and the large sprocket at the back. Next, loosen the anchor bolt on the switch (which secures the cable), then tighten it all the way and loosen the adjusting drum on the shifter by one turn.

The lower gear limiter serves to prevent the chain from moving beyond the smallest sprocket. If you tighten the stopper too tightly, it will be difficult or impossible to change gear to a small sprocket, and if you tighten it too loosely, then the chain will jump off the sprocket. The position is adjusted by turning the adjusting screw L, when turned clockwise, the switch frame moves towards the frame, and when turned counterclockwise, the frame moves towards the large star. Tighten the stopper so that the chain is as close to the inside of the derailleur frame as possible, but does not touch it.

After that, you need to pull the cable and secure it with an anchor bolt.

Switch position

The very first and basic setting of the front derailleur is to install it on the frame. There are two aspects to pay attention to. the angle of installation and the height.

To set the bike’s front derailleur at the correct angle, look at the derailleur frame from above. By turning it on the frame, put the switch in such a position that the axis of its frame is parallel to the axis of the driving sprocket. If you allow a slight shift of the front frame inward (closer to the frame), this can prevent the chain from jumping off the small sprocket when shifting, however, when driving on a large sprocket, the chain can rub against the frame (when there is a small sprocket on the cassette). Allowing to shift to the other side (when the front of the frame is turned outward) can help eliminate chain friction on the frame, however, when switching to a smaller sprocket, the chain can jump off the chain. True, for the chain jumping off, you can install a chain limiter.

Correctly adjusted front derailleur mounting height also affects gearshift clarity. Typically a 2mm gap is left between the outer frame and the top sprocket of the large chainring, however some cyclists want a smaller distance. Accordingly, the shorter the distance, the clearer the gear change.

In order to achieve the minimum clearance when installing the front derailleur, it is necessary that the bend of its frame matches that of the sprocket. If the sprocket is too large than the derailleur is rated for, then its front part will touch the teeth and the gap will have to be increased. And if the star is less than the calculated derailleur, then the quality of gear shifting will not change, but the chain, being on a small star, may start rubbing against the frame.