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Chapter 3: Adjustment21
Rear Derailleur
On bicycles with more than one cog on the rear
wheel, the rear derailleur makes the gear changes.
To adjust the small-cog position
1. Move the chain to the smallest rear cog and
the largest front chainring.
2. Decrease the tightness of the cable-clamp
bolt (Figure 23) until the cable is free.
3. Move behind the bicycle to see that the
smallest rear cog, the chain, and the two
derailleur pulleys are in alignment.
4. If they are not in alignment, turn the high-
gear limit-screw (usually identified with an
“H”,) until they are in alignment.
5. While you pull on the cable, move the shift-
lever to the small-cog position.
6. On the shift-lever or down tube, fully
turn clockwise the barrel-adjuster. Fully
turn clockwise the barrel-adjuster on
the rear derailleur, then turn it one turn
counterclockwise.
7. Put the cable into the clamp-bolt groove on
the rear derailleur, pull the derailleur cable
tight, and tighten the cable-clamp bolt to 44-
60 lb•in (5.0-6.8 N•m).
To adjust the large-cog position
1. Turn the low-gear limit-screw on the rear
derailleur (usually identified with an “L”)
counterclockwise until the derailleur can
move freely.
2. Carefully move the chain to the smallest front
chainring and the largest rear cog.
Do not move the rear derailleur too far. The
chain can be caught between the large cog
and the spokes.
3. Move the rear derailleur pulleys in alignment
with the largest cog.
4. Turn the low-gear limit-screw clockwise until
it does not turn easily.
If you have turned it too far, the derailleur
will move to the outside of the bicycle.
5. Change gears to all the gear combinations.
Make sure the chain does not come off when
you change gears.
To align the index system
1. Move the chain to the largest front chainring
and the smallest rear cog.
2. Move the rear shift-lever for one click.
3. Make sure the chain moves smoothly to the
second-smallest gear.
If the chain makes too much noise or does
not change gears, slightly turn the barrel-
adjuster. Change the gear again and make
sure the change is smooth.
If the chain moves to the third smallest gear,
turn clockwise the barrel-adjuster until the
derailleur pulleys align with the second-
smallest gear.
4. Change gears to all the gear combinations to
make sure the chain smoothly lines up with
each of the rear cogs.
If the derailleur can not be adjusted correctly,
the derailleur hanger could be out of alignment.
Transport your bicycle to your dealer for repair.
FIGURE 23:
Rear derailleur
1. Limit-screws
2. Barrel-adjuster
3. Cable-clamp bolt
4. Cable
1
2
3
4
26


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