switch speeds on a bike is to change the load required for a full turn of the wheel.In practice, the cyclist, changing the transfer speed, cadence changes.Each transfer will be most effective for your type of terrain.Speed selector may be different (depending on the type of mechanism that is embedded in its base).There are the following species: mechanisms of external shifting mechanisms with internal shifting, mixed arrangements.
switch speeds on a bike with internal shifting
This type of switch is characterized by the fact that here, in contrast to the external transmission mechanism is hidden in the back of the sleeve, and which carried out all the steps to change speeds.Usually, with this type of mechanism to date available road and touring bikes.Although sometimes this type of transmission can be seen on the mountain, "great".
Due to the fact that the mechanism of closed metal, its advantages are: wear resistance and durability, protection from bad weather and road conditions, built-in brake, as well as easy maintenance.The disadvantage of this type of mechanism is understandable difficulty in repairing the road where there is no special tool.It is also not particularly happy very intense friction mechanism nodes.Moreover, such a plan products are rather heavy, which increases the weight of your bicycle in general.
switch speeds on a bike with external shifting
It is the most common version on modern bikes (classical mechanism).It provides just two derailleur front and zadniy.Peredny simply throws chains from star to star.This mechanism may also have a number of options, which have the following things:
1) according to the method of fixing the frame (with the clamp or clamps of the carriage);
2) different angle can be set with respect to the switch frames;
3) wire drive in different embodiments may be attached to a mechanism (the underside or upper side).
rear shifter has a small feature.Firstly, it is here that the chain tension is ensured.Secondly, on the switch of the essential part for this bicycle speed (so-called asterisks).If the front derailleur only three stars, then this may be up to nine in the same cassette (in most modern bicycles).
On a positive note following a mixed system: low weight, a large number of programs, budget price, simple design that allows independent repair.However, there are drawbacks: low resistance to weather and road disasters, shorter period compared with closed mechanisms.
switch speeds on a bike with a mixed mechanism
This variant combines the sleeve and a classic switching mechanism.However, the trouble such switches is that their advantages hardly cover disadvantages inherited from both types.For this reason, they very rarely seen on the roads.
