How much the derailleur moves is decided by the derailleur’s rear shift ratio and the cable pull of the shifter. For example, the cable pull of an 11-speed road shifter is 2.7mm whereas that of an 11-speed MTB shifter is 3.6mm. Indexed shifters pull a different amount of cable per click. Or in other words, a 10-speed MTB derailleur moves 1.2mm per 1mm of cable movement initiated by the shifter while a 10-speed road derailleur moves 1.7mm. The rear shift ratio of a 10-speed MTB derаilleur is 1.2 whereas that of a 10-speed road derailleur is 1.7.
The rear shift ratio of a derailleur describes how much a derailleur moves per 1mm of gear cable pulled or released by the shifter. However, the “rigidity” of indexed shifting is also a source of incompatibility between drivetrain components. If the gears are properly adjusted, a single click is all it takes to shift.
This simplifies the shifting process and the necessary input. Indexed shifters pull or release a pre-determined amount of cable with each click.
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