The derailleur or rear derailleur is one of the components of the bicycle that ensures a perfect gear change, since its proper function depends mainly on whether the chain is on the correct sprocket or if it presents annoying "rattle".
Do you want or need to change the rear derailleur? What should you keep in mind? Above all: there are operational exceptions, but basically the changes have to fit with the controller. Finally, it is not only the levers that predetermine gear changes, but also the derailleur with its angles and the length of the levers has a relationship in the transmission. Only with the appropriate proportion given or extracted from the wiring of the shifters (pro click on the lever) and the gear ratio of the gears. As a result, the derailleur will stay exactly where it should be. You should pay attention to the issue of compatibilities.
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