Adjusting The Front Derailleur - Scott TIME TRIAL MACHINE Owner's Manual

Adjusting the front derailleur

The range within which the front derailleur (a) keeps the chain on the chainring
without itself touching the chain is very small. If the chain tends to jump off the
chainring, you will need to reduce the movement range in the same way as with
the rear derailleur, i.e. by turning the limit screws marked "H" and "L" (b). The
limit screws are adjusted by your SCOTT dealer. They do not alter their position
during normal use.
Start by shifting to the large chainring (front) and the smallest sprocket (rear)
(c). Turn in the outer limit screw ("H") exactly to the point where the chain does
not touch the front derailleur, even under heavy load. And only at the point
where the chain does not move any more from the middle to the large chain-
ring, the limit screw can be released a little.
Continue by shifting to the smallest chainring (front) and the biggest sprocket
(rear). Turn in the inner limit screw ("L") exactly to the point where the chain
does not touch the front derailleur. And only at the point where the chain does
not move any more from the middle to the small chainring, the limit screw can
be released a little.
This adjustment prevents the chain from falling off, which would suddenly inter-
rupt the drive involving the risk of an accident. In cases of doubt this adjustment
is a job best left to your SCOTT dealer.
As with the rear derailleur, the cable of the front derailleur is subject to length-
ening which leads to a reduced precision in gear changing. If necessary, shift to
the small chainring and increase the tension of the Bowden cable by turning the
adjusting bolt through which it passes at the entry to the in-line barrel adjusters.
WARNING
Always check after an accident whether the guide plates of the front derail-
leur are still parallel to the chainrings (d). Make sure they do not touch the
large chainring which would block the drive. Risk of accident!
Adjusting the front derailleur is a very delicate job. Improper adjustment can
cause the chain to jump off, thus interrupting the power train. Risk of falling!
a
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b c
OWNER'S MANUAL 2021 | ROAD BIKE