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Adjusting the Rear Derailleur
Increase the tension of the Bowden cable by turning the adjustable
cable stop at the shifter lever
runs into the rear derailleur (b). To do so, shift to the smallest sprocket
and turn the bolts anticlockwise in half turns until the cable is slightly
tensioned.
After tensioning the Bowden cable check whether the chain immedi-
ately climbs onto the next larger sprocket. To find out you either have to
a
turn the cranks by hand or ride the WHEELER bicycle and shift through
the gears.
If the chain easily climbs onto the next larger sprocket, check whether
it just as easily shifts to the small sprockets. If it does not, release the
respective adjusting bolt a little. You may need several tries.
A
b
I
Adjusting the Limit Stops
The rear derailleur is equipped with limit screws
movement range of the derailleur, thus preventing the derailleur and
chain from colliding with the spokes or the chain from dropping off
the smallest sprocket. The limit screws are adjusted by your WHEELER
bicycle dealer. They do not alter their position during normal use.
c
If necessary, correct the position by means of the limit screws. The limit
screws on rear derailleurs are often marked "H" for high gear and "L"
for low gear (d). "High gear" means that the chain is running on the
smallest sprocket. Turn the screw clockwise to shift the rear derailleur
towards the wheel and anticlockwise to shift it away from the wheel.
Shift to the biggest (inmost) sprocket and check whether the teeth of
the sprocket and the teeth of the guide pulley are all in a perfectly
vertical line. Turn the limit screw marked "L" clockwise until the rear
derailleur stops moving towards the spokes and can neither be moved
d
by actuating the shift lever nor by pushing it with your hand.
56
(a)
or the adjusting bolt through which it
Adjusting the front and rear derailleur accurately is a job
for an experienced mechanic. Comply also with the instruc-
tions of the gear manufacturer, which you can find on the
enclosed CD. Contact your WHEELER bicycle dealer if you
have any problems with the gears.
Ask a helper to lift the rear wheel. By turning the cranks and
shifting through you can easily check the function.
(c)
which limit the
This adjustment prevents the chain from getting stuck between sprock-
et and spokes or the rear derailleur or the derailleur cage from touch-
ing the spokes, which could result in damage to the spokes, the rear
derailleur and the frame. In the worst case, it could be impossible to
continue cycling.
A
If your WHEELER bicycle has tipped over or the rear derail-
leur received a blow, the rear derailleur or its mount, also
referred to as the derailleur hanger, might be bent. It is ad-
visable to check its range of movement and readjust the
limit screws, if necessary, after such an incident or after
mounting a new rear wheel on your bicycle.
A
Do a test ride in a place free of traffic, after adjusting the
gears of your bicycle.
I
Let your WHEELER bicycle dealer maintain and service your
WHEELER bicycle regularly.
Adjusting the Front Derailleur
The range within which the front derailleur
(e)
keeps the chain on the
chainring without itself touching the chain is very small. The movement
range is reduced in the same way as with the rear derailleur, i.e. by
turning the limit screws
(f)
marked "H" and "L". The limit screws are
adjusted by your WHEELER bicycle dealer. They do not alter their posi-
tion during normal use.
As with the rear derailleur, the cable of the front derailleur is subject
to lengthening which leads to a reduced precision in gear changing. If
necessary, shift to the small chainring and increase the tension of the
Bowden cable by turning the adjusting bolt through which it passes at
the entry to the gear shifter (g).
G
Always check after an accident whether the guide plates of
the front derailleur are still parallel to the chainrings. Make
sure they do not touch the large chainring which would
block the drive. Risk of accidents!
G
Adjusting the front derailleur is a very delicate job. Improper
adjustment can cause the chain to jump off, thus interrupt-
ing the power train. This can cause an accident!
A
It is essential to make a test ride in a place free of traffic,
after adjusting the gears of your bicycle (h).
e
f
f
g
h
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