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External gears (derailleur gears)
The derailleur gear system must always be cleaned of dirt and grime and be well cared for in order
to function. It is normal for the chain and rear sprocket to be changed every approx. 3,000 km or
minimum every two years - and more often if said maintenance is not observed. Since the chain
and rear sprocket wear together, you should always replace both parts at the same time.
Note that the rear derailleur must be correctly adjusted, i.e. the two chain guide wheels parallel to
that of the cassette, and never beyond the two outermost gears. If the rear derailleur or the fork
end is pushed inwards (the bike may, for example, have fallen over without you knowing it), the de-
railleur can go into the spokes of the rear wheel, with major damage as a result.
Like the other parts of the gear system, the freewheel/cassette housing must be lubricated regular-
ly. If the bike is not used for an extended period, the freewheel/cassette hub must be particularly
well lubricated. Dismantling the freewheel/cassette hub requires special tools and should be car-
ried out by a specialist.
When cleaning, do not use high-pressure cleaners/washers.
Only shift gears when pedalling forward. Changing gears when pedalling backwards can cause se-
rious damage on the gear system.
Useful links:
www.shimano.com
Crank and head sets
Crank and head sets (bearings) must be well lubricated and move easily and without play. If there
is a play, it must be corrected, otherwise bearings and other parts such as e.g. fork tube thread
may be damaged.
Play must be corrected by the bicycle dealer.
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