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A derailleur cable doesn't need to pull as hard as a brake cable but - if the system is indexed - it needs to transmit energy precisely from the shifter to the derailleur. Select the position that pulls the least derailleur cable. Usually the highest gear at the rear and the lowest gear at the front. Thread the cable into the shifter. This is easiest if you take careful note of the path of the old derailleur cable before removing it.
Derailleur (mech) Cleaning and Set-Up. Whilst the handlebar shifter is the âbrainsâ of your gears, the derailleur is the part that gets to do the hard work and so its condition is important for good gear changes.ou may even find that you have to open the derailleur cage right out in order to get your Allen key in. One of the most obvious variations in derailleur components is the design of the jockey wheels, or, to be more specific, the type of bushings or bearings that they use.