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ENGLISH ENGLISH
ROAD BIKE | OWNER’S MANUALOWNER’S MANUAL | ROAD BIKE
b ca e fd
| 6 8 6 9 |
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 (d). 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 (e). 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.
DANGER!
G
Do not ride with untrue wheels. In the case of extreme side-to-side wobbles, the
brake pads of rim brakes can miss the rim and get caught in the spokes! This
normally instantly jams the wheel and throws you off your bicycle.
CAUTION!
A
Loose spokes must be tightened at once. Otherwise the load on the other spokes
and the rim will increase.
CAUTION!
A
Truing (retruing) wheels is a difficult job which you should definitely leave to your
BERGAMONT dealer (f).
CARBON WHEELS
As carbon wheels are made of carbon fibre reinforced plastic they come with
particular aerodynamic properties and low weight.
In case you want to mount carbon wheels, ask your BERGAMONT dealer for advice.
DANGER!
G
If you mount wheels with carbon rims on your BERGAMONT road bike, you must
most probably change the brake pads, as conventional brake pads often do not
provide the desired braking effect. It is essential to also observe the manuals of the
wheel manufacturer.
DANGER!
G
Treat your tyres with care. Always ride your bicycle with the prescribed tyre
pressure 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 manuals of the rim or wheel manufacturer.
VALVES
There is only one valve type in general use on BERGAMONT road bikes: The Sclaverand or
Presta valve that is designed to withstand extremely high pressures (a). It has a plastic cap
protecting the valve from dirt.
You first have to undo the small knurled nut a little and depress it carefully until air
starts to escape (b). Check the nut is tightened and seated in its stem, otherwise air
may slowly leak out. It can be hard to inflate tyres to the necessary pressure by using
hand pumps. It is much easier with a foot-operated or a track pump equipped with a
pressure gauge (c).
35


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