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DERAILLEUR SYSTEMS
The derailleur system includes the font and rear derailleurs, the shift levers, and the derailleur control cables, all of which
must function correctly for smooth gear shifting to occur. There are several different types of derailleur systems, but all
operate using similar principles. Your new bicycle may be fitted with an “indexing” or “click” shifting system (SIS), which
links each gear position to a positive click mechanism in the shifter, and makes shifting very simple and precise. A further
development of SIS is the fully integrated system (STI) where the shift lever and brake lever mechanisms form an
integrated unit on the handlebars.
Inspection
The operation of the derailleur system should be checked at
least every month. Check the operation of the rear derailleur
first, then the front. The rear derailleur should shift the chain
cleanly from one cog to the next without hesitation. On SIS
equipped bicycles, each notched position in the shifter must
equate to a new gear position. After shifting, the rear derailleur
should not rub on the chain. The derailleur should never cause
the chain to fall off the inner or outer freewheel cogs.
The front derailleur should also shift the chain cleanly and
without hesitation between each chainring. If your bicycle is
equipped with front SIS, then each click or stop in the shifter
should equate exactly to a new gear position. When the chain
has been positioned onto a new chainring, it should not rub
on the front derailleur. The chain should not fall off a chainring
at any time. Derailleur control cables are a critical component
that must be well maintained for accurate shifting performance.
Check them for any sign of rust, fraying, kinks, broken strands
and any damage to the cable housing. If you find any
problems, the cables may need replacing before you ride.
Pre-stretch the derailleur
cables to remove slack
Stretch
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