Dérailleur

Generally the problems in this area will be with the dérailleurs or the chain.

To this effect, the subject of the invention is a control device for a dérailleur-gear for a bicycle, of the type as described previously, characterized in that the cable for actuation of the dérailleur-gear is connected to an actuation stud rotated by the operating hand-lever, and on which are provided the control mechanism and the means for attaching the moveable part of the device to the fixed part of the latter.

Adjusting a dérailleur may look complicated, but the process is actually simple and can be done by anyone.

A cunning mechanical gear-shift called a dérailleur allows you to do this as you’re bicycling along, even while the gear wheels and the chain are spinning at speed.