Bikes and Gear

Know your bike’s gear system

How good is your bike’s gear system? There are those who don’t like it very much because it seems complicated and makes our lives difficult. On this occasion, we will review the gear system and its components in a general way, that is if you want to get competitive like me mentioned here.

Simply put, the gear helps us to raise the slopes more easily, to start without having to apply so much force and to accelerate when going down. In short, they allow the pedal effort and rhythm (cadence) to be optimal.

We can classify the types of gear into two large groups:

  1. Internal gear
  2. External gear

Internal Gear

Internal changes are inside the back Mace of the bike. They usually have a single pinion, although it is possible to find hybrid systems that combine internal changes with a diverter system and two or more pinons.

Internal gearboxes work in a similar way to the gearboxes of automobiles, using different combinations of planetary gears allow different speed relationships. The main advantage of this system is that it requires less maintenance as a sealed system. In addition, they allow changing speed without the need to pedal what makes them especially practical in the city.

Components of internal gears

  1. Lever / control
  2. Chains and linings
  3. Indicator chain
  4. Mace with internal chains

External Gear

External gears are much more common. This system consists of a set of pine nuts attached to the rear mace with a rear diverter. Some bikes can also include two or three dishes with a front diverter.

The main advantages of external changes are their weight and cost. Hence his great popularity. However, being exposed requires greater maintenance and are more likely to be damaged by some impact.

Components of external gear

  1. Levers / controls
  2. Chains and linings
  3. Rear diverter
  4. Forward deflector

Components of Bike Gear

Levers / Controls

We can say that the controls are responsible for sending the signal to control the chains. When selecting a position in the controls, the tension of the chains varies.

Chain and Lining

The chain is a steel wire which slides into the inside a lining. The chain voltage regulates the position of the deviator (external gear) or the indicator chain (internal gear).

Forward Deflector

The front derailleur consists of a “cage” of metal where the chain runs. This, in turn, is attached to the seat tube of the bicycle. This cage has moved to the sides and causes the chain to move also between the plates. The front deflector is operated from the gear lever on the left side.

Rear Diverter

The rear diverter is a little more complicated when compared to the rest of the gear pieces of the bike. This mechanism is fixed in the right dropout of the bicycle and consists of an articulated arm, a cage and two pulleys (guiding pulley and having tensor). We invite you to read more about the rear diverter here.

The diverter has the dual function of placing the chain on the desired pinion as well as maintaining the tension of the chain.