Figure 1:
Front derailleur clamp bolt
Chapter 3: inspection, adjustment, and lubrication
Derailleur adjustment should be done with the bicycle held firmly in a workstand, or with someone holding the rear wheel off the ground such that the drivetrain and shift system can be operated while the bicycle remains stationary.
1. Shift the chain onto the smallest front chainring and the largest cassette cog.
2. Loosen the front derailleur cable clamp bolt (Figure 1) until the cable is free.
3. Turn the low gear adjusting screw (marked “L”, Figure 2) until the inner chain guide of the derailleur is approximately 0.5 mm from the chain.
4. Pull on the cable end, and down-shift the left shift lever several times so the shifter is in the small-chainring position.
5. Turn the shift cable adjusting barrel to its most clockwise position.
6. Insert the cable in the groove found next to the derailleur cable clamp bolt, pull the cable taut, and clamp the cable to the torque specifications.
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Figure 1: Front derailleur clamp bolt |
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Figure 2: Inner limiting screw affects low gear |
1. Shift the rear derailleur to the smallest rear cog.
2. While hand-turning the cranks, use the shifter to carefully shift the chain onto the outside chainring.
3. With the shifter, position the outer chain guide of the front derailleur approximately 0.5 mm from the chain.
4. Re-tighten the high gear adjusting screw (Figure 3) until it meets resistance.
If you have turned the screw too far, the front derailleur will move toward the small chainring.
Check your adjustments; go through the various gear combinations. Make sure the chain does not fall off when you shift, and the derailleur cage does not rub on any part of the crankset.
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Figure 3: Outer limiting screw affects high gear |
1. Shift the chain onto the largest front chainring and the largest rear cog.
2. Rotate the cable tension barrel-adjuster (on the downtube, or on the lever) counter-clockwise increasing cable tension to align the inner derailleur cage until it just touches the chain.
Go through the various gear combinations to ensure the chain smoothly lines up with all the chainrings.
