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a
b
c
d
Modern mountain bikes can have up to 33 gears. As
there are, however, overlapping ranges, actually 15 to 18
gears are usable. It is not advisable to use gears which
involve an extremely oblique run of the chain, as this re-
duces power transmission efficiency and hastens wear
of the chain. An unfavorable run of the chain is when
the smallest chainwheel is used with one of the two or
three outermost (smallest) sprockets
(a)
or when the
largest chainwheel is used with one of the inmost (larg-
est) sprockets
(b)
.
The bottom bracket
(c)
is the interface between cranks
and frame. There are different designs, in some cas-
es 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 de-
livered 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
(d)
. If you notice any
play, contact your MERIDA dealer immediately.
Depending on the gear system, gear shifting is initiat-
ed by actuating a shifter
(e)
, 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 shift lever types
and their operation. It is, however, also possible that
your new MERIDA bike has a gear system that is not
listed below.
In the case of shifters pressing the large shifter (thumb
shifter)
(f)
moves the chain towards the larger chain-
wheels/sprockets.
That means that any gear shift made by pressing the
large thumb shifter on the right produces a lower gear.
This is an indexed shifting system with the option of
shifting several gears with one action. Actuating the
large thumb shifter on the left produces a higher gear.
Pulling the small lever located in front of the handlebars
from the rider’s viewpoint and actuated with the index
finger (index finger lever)
(g)
shifts the chain towards the
smaller chainwheels/sprockets, i.e. on the right side to
the higher gears and on the left side to the lower gears.
I
Read in any case carefully the operating in-
structions of the gear manufacturer on this
MERIDA CD-ROM. Make yourself familiar
with your new gears in an area free of traffic, if neces-
sary. If you are in doubt or if you have any questions,
contact your MERIDA dealer.
56


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