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Bergamont CITY - 2019 Manual

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ENGLISHENGLISH TREKKING AND TREKKING‑PEDELEC | ORIGINAL OPERATING INSTRUCTIONSORIGINAL OPERATING INSTRUCTIONS | TREKKING AND TREKKING‑PEDELEC
b ca e fd
With Presta valves you first have to undo the small knurled nut a little and depress it
carefully until air starts to escape. Check the nut is tightened and seated in its stem,
otherwise air may slowly leak out. Do not forget to tighten the valve by hand nut after
inflating.
Tyres with Schrader valves can conveniently be inflated at car filling stations with
a compressed air dispenser. The same applies to Dunlop and Presta valves fitted
with a special adapter. A compressed air dispenser must be used very carefully as
you may otherwise overinflate the tyre and make it burst.
To let out air, press the needle in the centre of the Schrader valve or the knurled nut of
the Presta valve (e).
In the case of the Dunlop valve unscrew the knurled nut until air comes out of the
valve. Retighten the knurled nut subsequently. Normally, you have to inflate the tyre
completely.
It can be hard to inflate tyres to the necessary pressure by using hand pumps. It is
much easier with a track pump equipped with a pressure gauge.
RIM TRUENESS AND SPOKE TENSION
For the true running of the wheel it is imperative that the tension exerted by the
spokes is distributed evenly around the rim. If the tension of a single spoke changes,
e.g. as a result of riding fast over a kerb or of a loose nipple, the tensile forces acting
on the rim become unbalanced and the wheel will no longer run true. The functioning
of the BERGAMONT bike may even be impaired before you notice the wobbling
appearance of a wheel that has gone out of true.
With rim brakes the sides of the rims also serve as braking surfaces. An untrue
wheel can impair your braking effect. It is therefore advisable to check the wheels for
trueness from time to time. For this purpose lift the wheel off the ground and spin it
with your hand. Watch the gap between the rim and the brake pads. If the gap varies
by one millimetre or more, you should ask your BERGAMONT dealer to true up the
wheel (f).
DANGER!
G
If you mount a new tyre with another size than the standard tyre mounted, it might
be possible that the clearance between the front of your shoe and the wheel will
be reduced when you ride at reduced speed. Also observe the space between fork and
frame. Risk of accident!
DANGER!
G
Treat your tyres with care. Always ride your bike with the prescribed tyre pressure
(a) and check the pressure at regular intervals, at least once a week. Riding with
too low or too high air pressure may make the tyre come off the rim or burst.
DANGER!
G
Clincher and folding tyres allowing an inflation pressure of five bars or more have to
be mounted on hook bead rims, identifiable by the designation “C”.
DANGER!
G
Observe the maximum pressure value of the rim. The pressure is dependent on the
tyre width. You can find the values in the operating instructions of the rim or wheel
manufacturer.
DANGER!
H
Note that a pedelec weighs more and that your usual tyre pressure may be insuf-
ficient. A higher pressure gives a better riding stability and reduces the risk of a
puncture. The minimum and maximum pressure (in bar or PSI) is indicated on the tyre
side.
VALVES
There are three valve types in general use on BERGAMONT city and trekking bikes:
1. Sclaverand or Presta valve (b): This valve is nowadays used on almost all types
of bikes. It is designed to withstand extremely high pressures.
2. Schrader or American valve (c): This is an adapted car tyre valve.
3. Dunlop or Woods valve (d): The usual valve.
All valve types come with a plastic cap to protect them from dirt. The Schrader
and Dunlop valve can be inflated with a suitable pump directly after removing the
protective cap.
| 8 4 8 5 |
… 43 …


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