Shimano - adjustment of the rear switch. Shimano rear switch adjustment

The theme of today's article is about setting up your bike. After all, there are many different nodes in it, which requires close attention and regular maintenance. Especially closely with you, we will focus on the products of the company Shimano. The setting of the rear speed selector has some nuances. If you have the equipment of another manufacturer, then do not neglect the materials described in this article, as the principles of functioning and debugging of all similar products are common, because they have a similar design.

Principles of operation

The operation of the rear derailleur still seems to many cyclists a mystery behind seven seals. After all, he can reliably and unpretentiously perform his functions, but one day "heal his own life." If you have no experience in eliminating such "independence", then this can be a significant problem, especially if such a malfunction falls like snow on your head, on the road. Therefore, usually beginning cyclists drive their "iron friend" to the workshop, where an experienced specialist in a few minutes eliminates this problem. However, what operations he performed, which regulated, lubricated or screwed, remains unknown. Therefore, you need to be patient and understand the principles behind the rear Shimano speed switch. If you follow the recommendations below, you will not have any difficulties with further servicing your bike with your own hands. It is important only to study the necessary theoretical basis and independently confirm it in practice.

Required Tools

First of all, you may need:

• Hex keys or their set (the presence of 3- and 5-mm mandatory);
• Crosshead screwdriver.

Before debugging, it is important to make sure that the mechanism is still functioning. For Shimano, the rear derailleur setting is carried out according to the manufacturer's recommended instructions, you may have it if the tensioner for the chain is purchased separately. If the bicycle was bought in assembly, then usually these documents do not.

Examination

Try to diagnose visually, in what state are the details of the speed selector. After all, you can spend hours studying theory and trying to repair, and eventually learn that the part can not be restored. To do this, stand behind the bicycle and try to make sure that the speed switch and its bracket (the cock) are on the same line and do not show any distortions or significant deformations. In this you can help a little chain that connects these elements, but it should also be in a satisfactory technical condition - well-oiled and with acceptable wear, since some difficulty in switching speeds can occur due to its unsatisfactory functioning or wrong type.

Similarly, with the gear shift cable - if it is rusty and constantly jammed in the casing, then there is no question of any reliability or usability of use. However, this situation is easier to fix, it is only necessary to add a graphite lubricant in the required amount, and, possibly, the adjustment of the rear Shimano switch will move faster.

Important Setup Steps

In this activity, there are three key stages, neglect or disruption of their execution may result in spoiled equipment or its costly repairs. Therefore, you only need to perform them in this order: tighten the shift cable, make sure the adjusting screws are in the correct position and adjust the tensioner yourself.

Casing and steel cable

Adjustment of this tool is very important, since the cable is responsible for the distance the speed switch is shifted when the dummies are clicked. If the tension is excessive, then the convenience of selecting the gears becomes much more complicated, and sometimes the chain can jump to neighboring stars or very slowly go to a lower gear. At the same time, if effort is not enough, then when the position changes, nothing will happen. Therefore, a suitably stretched cable can eliminate half of the difficulties that arise in Shimano Alivio systems. Rear switch them often causes inconvenience due to the features of the structure. After all, the middle class line, to which this type of device belongs, is not intended for too intensive use, as professional, for example, Deore or its analogues.

Adjustment position

Changes that are designed to limit the displacement of the chain of the bike are performed by special screws. Usually, the upper one is responsible for the offset that the rear switch receives (Shimano Tourney and other budget series) when the transmission increases, while the lower one is aimed at lowering. If the chain jumps through the largest star, then it is the position of the gears when they increase and must be changed. Similar actions are carried out with decreasing speeds. However, every car enthusiast needs to know that if the rear derailleur was bent and then aligned, then it must be re-tuned, as it changes its position.

Tensioner and its adjustment

This adjusting screw is used very infrequently, since it helps to adjust the location of the upper pulley relative to the cassette along which the chain moves. If it is not twisted, the above details can touch each other and cause a lot of inconvenience. However, this situation is very rare, since this node is fastened securely enough and there is no play in it, which would help to weaken it.

At Shimano the setting of the rear speed selector is very accessible, however it may seem too difficult for beginners. Although this mechanism has a simple design, its adjustment requires scrupulous attitude and patience. Haste here is inappropriate, especially if the work is done for the first time.

Special cases and their resolution

If the chain skips while turning the pedals with a little effort, then, most likely, it stretches out along its length and requires replacement. With its use in this form, it is possible to damage not only the stars of the system, but also the cassette, which will make them unfit for use. A worn chain crimps their teeth or forms a recess on them, after which these gearshift elements can not be used.

When changing speeds, make sure that the chain moves without distortion. Although its location is fixed, if you have a Shimano Deore rear switch or a class higher, but for people using more common attachments, these cases are not uncommon. This fault leads to an accelerated deterioration of the system and circuit components, so it must be taken very seriously.

If the gear shift is suddenly broken and no longer works, then, most likely, there are difficulties with the cable. Either there was a breakage, or it was unreliable fixed with a fixing bolt.

If you have Shimano attachments installed, the rear-mounted switch setting has already been made and it does not function properly, you need to make sure that the cable in the shirt is loose. If it has breaks or places with a woven winding, then it must be replaced. Similar problems can also occur if the bike's cock has been bent.