Decathlon BTWIN User Manual And Guarantee page 22

CONVENTIONAL GEAR CHANGER
The gear changer stroke (front and rear) should not be too large so as not to
derail the chain. Both gear changers should be adjusted as explained below:
L
H
L
H
SPEEDS IN THE HUB
REAR GEAR CHANGER:
Turn the screws stop as shown in the diagrams to align
the rear gear changer roller below the large spindle
(when the turning wheel is at the slow speed) and
below the small spindle (when the turning wheel is at
the greatest speed).
The screw marked H prevents the chain from going
beyond the large spindle and the screw L prevents it
from going beyond the small spindle.
FRONT GEAR CHANGER:
Turn the screws stop as shown in the diagrams having
previously position the chain as shown. The space bet-
ween the chain and the guide should be between 0
and 0.5 mm.
The screw marked L prevents the chain from derailing
in the frame, the screw marked H prevents derailing in
the right-hand pedal.
Setting speeds in the hub is very simple. The
method is explained in detail in the manufacturer's
instructions. This system enables you change speeds
when stopped, without noise and instantly and you
cannot derail. Single speed bicycles or those fitted
with hubs do not have gear changers and need no
specific maintenance. The chain tension should
however be verified (it slackens over time). Too
strong tension in the chain could damage the effec-
tiveness of the bicycle amateurs in its lifespan
(pedaling hard). A too weak tension may lead to
fre- quent derailments.