DualDrive · December 2002
9
E
M A I N T E N A N C E A N D C A R E
G E A R A D J U S T M E N T
Chain gap adjustment:
Chain gap is the distance between the
upper guide pulley and the cog the
chain is riding on. Optimal chain gap
allows quick, efficient shifts.
» While turning the crank, push the
rear derailleur inboard by hand to
the largest cog.
» Hold the derailleur in this position
while making the following adjust-
ment.
Use a 3 mm hex wrench, turn
the b-adjust screw until the
chain gap equals approximately
6 mm (
1
/
4
”).
– Turn the b-adjust screw clock-
wise to increase the chain gap.
– Turn the b-adjust screw
counterclockwise to decrease
the chain gap.
Do not use the b-adjust screw
to adjust the rear derailleur
to act as a chain-tensioning device
or to prevent chain suck. This
increases the chain gap causing
poor shifting performance.
Index shifting adjustment:
» Make sure the chain is located on
the smallest sprocket.
» Shift the chain to the second cog.
– If the chain hesitates or does not
shift, increase the cable tension
by turning the shifter barrel
adjuster counterclockwise.
– If the chain shifts beyond the
second cog, decrease the cable
tension by turning the shifter
barrel adjuster clockwise.
» Repeat the two former steps until
shifting and cable tension is
accurate.
» While turning the crank, shift the
chain up and down the cassette
several times to ensure that your
derailleur is indexing smoothly.
3 mm
6 mm
(
1
/
4
"
)
6
6