Yamaha PW SYSTEM Manual page 11

Gearing
There are basically two types of gears. Hub gears (internal) and derailleur gears (external). Com-
mon to both gear types is that they require correct adjustment, lubrication and regular maintenance
in order to function optimally.
Hub gears
It is important for the life of the gear that the gears are adjusted correctly. Contact the bicycle deal-
er immediately if it is found that the gear does not work perfectly. Driving for too long with an incor-
rectly adjusted gear can damage the hub.
Due to the climatic conditions in Denmark, it is important, regardless of what the gear manufacturer
states, that the gear hub is disassembled, cleaned and lubricated at least once a year.
If the hub is exposed to salt water, it must be disassembled, cleaned and lubricated immediately to
prevent corrosion damage that could render the hub unusable.
Disassembly, cleaning and lubrication must be carried out by a specialist.
If the bicycle is cleaned with water, it is important to ensure that the water does not penetrate the
gear hub. Never use high-pressure cleaners/washers.
Rear derailleur
(parallel to cog)
Rear derailleur
(parallel to cog)
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