The Bicycle Transmission System

The transmission system is the link between the power transmitted by your legs to the rear wheel.Everything is history braquet and maintenance. Here is some information to better understand the mechanical element.

Understanding the parts of the transmission cycle

The transmission system consists of a pedal cranks equipped with plates, tape, two gears and a chain connecting the cassette to the pedal. On a bike, the transmission is always on the right.

It is equipped with plates. In your practice you can opt for a double or triple crankset trays. This is the number of rings present on the front pedal. The small plateau is the closest of the frame. Each tray has a number of teeth. Teeth are a flute necessary to drive the chain.

Folder: Choose trays for road cycling: single, compact, double or triple?

A triple plate, here the number of teeth generally used, although there are many possibilities:

  • 52x39x30
  • 50x39x30

Double plateau :

  • 52×39
  • 53×39

Double plateau compact :

  • 50×34
  • 50×36
  • 52×36

The arrival of compact recent years allows an excellent compromise for cyclists.

The cranks

The cranks are the levers present on the pedal connecting the bike pedals, says Bicycle Bazzar. Different sizes exist and you have to pick your pedal according to these common sizes:

  • 170 mm
  • 172,5 mm
  • 175 mm

The pedals

Present on the cranks, they are the physical link between the transmission and the foot of the cyclist.

Feature: How to choose automatic bicycle pedals?

The front derailleur

It allows you to navigate the chain of small chainring to large chainring. The latter setting is simple, simply adjust the external stops to prevent the chain from going too far and derail.

The role of the front derailleur is important and the gear shift manipulation must be done with tact, because this change is causing many derailments race. On a bike, controlling the front derailleur is in the handle or lever left. Remember to regularly clean and maintain it.

Cassette

The tape is the element that is mounted on the rear wheel. It is composed of gears with a number of teeth spaced from smallest to largest. The smallest pinion being farthest from the shelves.

The number of gears is usually 10 or 11 speeds depending on the brand. They are the ones that cause the width of the chain. The more gears, plus the width of the chain is reduced and therefore weakened.
Example of composition:

  • 1-25
  • 12-26
  • 11-23

A tape must be changed depending on its mileage and wear.A heavily used cassette damage your chain and offers little performance when shifting gears. You will need to change the system, when you change the cassette. Also remember to keep the tape: Cleaning and repeated lubrication.

The chain of your bike

The chain is the key element that connects the various workings of the transmission. She is also concedes that the more wear. The chain should be changed regularly depending on your mileage and global environment in which you ride. Usually changing a chain all 5000 kilometers.

The rear derailleur

It is the shift of the gear. The rear derailleur is composed of a spring and roller. It is attached to the bicycle frame, the aluminum derailleur hanger for this purpose. On a bike, controlling the front derailleur is in the handle or lever right.

The spring is usually the life of the derailleur. However you will need to change the rollers every 10,000 km.
The maintenance of the rear derailleur is important, remember to clean it. When the rollers, they must be clean without dirt stuck to them. It is not necessary to lubricate thereof.Lubrication is via the chain.

Command transmission

On a traditional group, the transmission is controlled by standard wiring handles. These are cables in ducts which connect the elements. These must be checked regularly and changed if worn too pronounced.

Internal cables

Bicycle frames now offer the possibility to integrate the wiring in the tubing. This is a real advantage in terms of design and ergonomics of the bike.

manual or electric transmission?

In recent years, brands have created electrical / electronic groups. The transmission is assisted and controlled via electric motors located in the front derailleur and rear derailleur.

Advantages are:

  • Removing traditional linkages to replace with simple electrical cables.
  • Better integration bike frame
  • lightweight mechanism in handles
  • Multiple possibilities of buttons in different places cockpit
  • Ease of assembly and adjustment
  • Passage of simplified and improved speed
  • Coordination of front and rear derailleur when the chain is working through.

Shimano Di2 electric transmission

Dura Ace has been tested it first in “private” in the mid-2000s before coming into the squad as a prototype in its final version in 2007 and to be marketed in late 2008 under the 7970 code . a less expensive version with the group Ultegra arrived in 2011 and the second generation of Dura Ace 9070 was marketed late 2012.

Electronic transmission Campagnolo EPS

Campagnolo EPS, understand Electronic Power Shift! This innovation to be coordinating the mechanical parts of a group of bicycle transmission to electronic technologies.

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