The client can adjust the reference position of the rear derailleur and/or derailleur using the adjustment procedure known as Riding Setting.
The adjustment of the rear derailleur is designed especially in case you change the wheel for one with a set of sprockets that are positioned differently with respect to the drop out.
It is possible to start the procedure for either the rear derailleur or the derailleur from any chainring.
Every time either keys 2 or 3 is pressed, the system performs a set displacement of 0.25 mm if you act on the rear derailleur, and approximately 0.1 mm if you act on the derailleur.
When you have completed the adjustment phase, the system will correct the established positions of all chainrings based on the new settings.