62
1
2
3
4
5
6
7
8
Try to avoid gears that make the
chain cross over at an extreme
angle, as they greatly increase its wear
and internal resistance, and lead to the
premature wearing away of cogs
(Figure 21).
Derailleur gear systems: control and readjustment
The shifters of your new bicycle were set correctly at the specialist
dealership. Nonetheless, the Bowden shift cables may stretch, causing
the incorrect functioning of the shifter. Since all shift systems operate on
the principle of tensile stress, the shift cables must be tightened properly
to ensure correct shifting.
1.
One way to do this is by turning the adjustment screw located
on the shifter or shift lever to the left. Always turn the
adjustment screw only a little, and keep checking whether the
shifter works correctly. As a rule of thumb, two quarter-turn
adjustments are better than a single half-turn one. If the chain
no longer passes freely from the biggest cog to the smallest
one, the shift cable is too tight, and should be loosened by
turning the adjustment screw to the right in small steps.
2.
If the tension of the shift cable can no longer be set correctly
with the adjustment screw, undo the screw that secures the
shift cable and pull the cable tighter. Make sure that the
adjustment screw is not fully tightened – this way you can
loosen the shift cable if you have overtightened it. Try shifting
gears: if it does not work correctly, repeat the steps described
in Article 1.
Figure 21
The most frequently used shift systems are manufactured by
SHIMANO and CAMPAGNOLO.
In SHIMANO's “Dual Control” system (Figure 20/3) you must press the
whole lever inwards to switch to a bigger cog. If you press the small
lever, the shifter moves the chain onto a smaller cog.
Shifting on mountain bikes follows the same principle (Figure 20/4):
depending on the design, by pressing the whole lever down you can
switch to a bigger rear cog, and by lifting the lever with a finger to a
smaller one. To help cyclists get used to shifting down a gear, these
levers are equipped with a removable extra lever.
In the CAMPAGNOLO Ergo-Power integrated gearshift and brake
lever system you can shift to a bigger cog by pressing the lever
underneath the brake lever. Use the thumb shifter next to it to shift to a
smaller cog. The current product offer of CAMPAGNOLO does not
contain any integrated gearshift and brake lever systems for mountain
bikes.
Never shift gears using both levers of the same shifter at the same
time!
Never shift gears if the bicycle is at rest!
Do not pedal backwards while shifting gears!
Do not use force to shift gears!
To assist the smooth transition of the chain between cogs, it is
important that you ride at a steady speed while shifting gears. If
possible, refrain from shifting gears under a heavy load, as this greatly
increases the wear of the chain and chainrings.
ENGLISH
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