49
g
f
h
e
U
CENTURION pedelecs have only one
chainwheel. As a consequence there is
no front derailleur and no shifter on the
left handlebars.
I
Read the gear manufacturer’s operat-
ing instructions on this CENTURION
CD-ROM carefully and practice shifting
gears until you are familiar with it before you set
off for the first time.
Functioning and operation
Derailleur gears always work according to the follow-
ing principle:
Large front chainwheel
– high/heavy gear – higher gear ratio
Small chainwheel (front)
– low/easy gear – lower gear ratio
Large rear sprocket
– low/easy gear – lower gear ratio
Small rear sprocket
– high/heavy gear – higher gear ratio
Normally the shifters are mounted as follows:
Shifter right – rear sprockets
Shifter left – front chainwheels
Modern city/trekking bikes can have up to 33 gears.
As there are, however, overlapping ranges, actually
15 to 21 gears are usable. It is not advisable to use
gears which involve an extremely oblique run of the
chain, as this reduces power transmission efficiency
and hastens wear of the chain.
The chain runs unfavorably when the smallest chain-
wheel is used with one of the three outermost (small-
est) sprockets (d) or when the largest chainwheel is
used with one of the inmost (largest) sprockets
(e)
.
The bottom bracket
(f)
is the interface between
cranks and frame. There are different designs, in
some cases the bearing spindle is part of the bottom
bracket, in some other cases it is integrated into the
right crank. Sealed bottom brackets are maintenance
free and delivered without play ex works. The bottom
bracket in the frame must be checked for play at
regular intervals.
Also check at regular intervals whether the cranks are
firmly attached to the bearing spindle or whether there
is play. Grab the crank and try to jiggle it forcefully. It
must be absolutely free of play
(g)
. If you notice any
play, contact your CENTURION dealer immediately.
Depending on the gear system, gear shifting is initi-
ated by actuating a shifter
(h)
, a brake and shift lever
unit or by a short turn of the wrist with twist grips.
Continue pedaling during gear shifting, however, with
reduced pedaling force.
Please find below the principles of the shifter types
and their operation. It is, however, also possible that
your new CENTURION bike has a gear system that
is not listed below.
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