25
1
2
10-15 mm
/
Maintenance / repairs
Please have your bicycle checked by
a specialist retailer on a regular ba-
sis. These experts can identify dam-
aged and worn parts and are able to advise
you in selecting replacements. Refrain from
repairing key parts yourself (frame, fork, han-
dlebars, stem, headset, brakes, lights).
Screws and torque spanners
When working on the bicycle, please
ensure that all screws are tightened to
the correct torque. The required torque is print-
ed on many parts with a screwed connection.
This amount is stated in Newton meters
(Nm) and this work should be carried out us
-
ing a torque wrench. A torque spanner is most
suitable for this job. Once the right torque is
reached, it gives way and clicks. Otherwise
screws can snap or break. If you don’t own a
torque wrench then you should always leave
this work up to a specialist retailer!
A table listing the most important torques for
bolted connections is provided on page 40.
Like every mechanical component, a
bike takes on extensive strain, wear
and tear. Different materials and bike
parts will react to wear and tear in different
ways. If a bike component’s recommended
period of use is exceeded, a malfunction may
occur which can in turn result in injury. Any
kind of rip, puncture or colour change occur-
ring in an overused area is an indication that
the component’s use has reached its limit; in
this case, the component should be replaced.
Chain
To ensure that it can work effectively, the chain
has to be cleaned and greased regularly (see
page 39). Dirt can be removed when washing
the rest of the bicycle. Otherwise you can clean
the chain by rubbing it with an oily clot. When the
chain is clean, it should be greased at the joints
with suitable lubricant. After being left to soak,
the excess lubricant should then be removed.
Torque spanner
To ensure that the chain and gears
can work safely, the chain must have
a certain level of tension. Chain gear
systems tense the chain automatically. In the
case of hub gears, chains which are too loose
must be tightened. Otherwise they can come
off and lead to a fall.
In the case of bicycles with adjust-
able dropouts, the mounting screws
of the axle housing should be loos-
ened and tightened, and not the axle nuts. If
the bottom bracket shell contains an eccentric
bush, please tighten the chain according to
the instructions provided by the correspond-
ing manufacturer.
Please ensure that axle nuts and
boosters are correctly attached!
Chain tension
Summary of Contents for Children's bike
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