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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.
Step 4. Now with the chain on the smallest cog on the rear cassette, pedal the bike with one hand and pull the front derailleur so that the chain goes onto the largest chainring at the front, and is again in the middle of the derailleur plates.sing the gear lever, go through all the gears several times. If the derailleur is slow to go into the lower gears, unscrew the cable adjuster on the derailleur body. If it is slow to go into the higher gears, screw in the cable adjuster. Re-check that all the securing bolts are tight and go for a gentle test ride.