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6. The Gears
The gears on your bicycle serve to adjust your pedalling power to the ter-
rain you are riding on and the desired speed. The gears do not reduce the
physical work to be performed which remains the same with the identical
distance to be performed at identical speed, but the pedalling force per
crank rotation. That means: A low gear (where in the case of derailleur
gears the chain runs on the small chainring and a large sprocket) allows
you to climb steep hills with moderate pedalling force. You must, howev-
er, pedal relatively fast.
High gears (large chainring, small sprocket) are for riding downhill. Every
turn of the pedals takes you many metres forward at correspondingly
high speed.
To ride economically you frequently have to shift gears. As with a motor
vehicle, your engine wants to be kept within a certain speed range, if
it is to give its best performance. On level ground your pedalling speed,
also referred to as cadence, should be higher than 60 strokes a minute.
Racing cyclists pedal at a rate between 90 and 110 strokes a minute on
level ground. When climbing uphill, your cadence will naturally fall off
somewhat. Your pedalling should, however, always remain fluid.
Finely graduated adjustments as well as an easy operability of modern
bike gears are the best preconditions for an efficient riding. In addition, it
reduces chain and sprocket wear as well as the strain on your knee joints.
The Gears
6.1. General Information on Derailleur Gears
Derailleur gears are currently the most effective type of power transmis-
sion on bicycles. About 97 to 98 percent of the pedalling force performed
is transmitted to the rear wheel with well-maintained and greased de-
railleur gears.
With specially designed sprocket teeth, flexible chains and clear-cut lever
positions, shifting gears has become very easy.
Danger:
Be sure to always wear
straight cut trousers or use
trouser clips or the like to
make sure your trousers do
not get caught in the chain or
the chainrings thus provoking
a fall.
32


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