67
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
(a)
.
G
Replace tyres with a worn tread or with brittle or frayed
sides. Dampness and dirt penetrating the tyre can cause
damage to its inner structure. The tube might burst.
danger
of an accident
!
G
Treat your tyres with care. Never inflate your tyres beyond
the maximum permissible pressure, otherwise they might
burst or come off the rim during the ride.
danger of an ac-
cident
!
G
Tyres allowing an inflation pressure of 5 bars or more have
to be mounted on hook bead rims, identifiable by the desig-
nation “C“. If you are in doubt or if you have any questions,
then contact your WHEELER bicycle dealer.
G
If you mount a tyre of another size than the standard one,
it may be that the tyre will rub against the suspension fork,
the mudguard, the brakes or other components and sus-
tain damage. This can even lock up the wheel. When buying
tyres, ask your WHEELER bicycle dealer for advice.
A
Always ride your bicycle with the prescribed tyre pressure
and check the pressure at least once a week
(b)
.
I
observe the maximum pressure value of the rim. The pres-
sure is dependent on the tyre width. You can find the values
in the operating instructions of the rim or wheel manufac-
turer
(c)
on the enclosed CD. If you are in doubt or if you
have any questions, then contact your WHEELER bicycle
dealer.
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 your WHEELER
bicycle may even be impaired before you notice the wobbling appear-
ance of a wheel that has gone out of true.
With rim brakes the sides of the rims also serve as braking surfaces
(e+f)
. An untrue wheel can impair your braking power. 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 more
than a millimetre, you should ask your WHEELER bicycle dealer to true
up the wheel
(g)
.
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.
A
Loose spokes must be tightened at once. otherwise the
load on the other spokes and the rim will increase.
A
Truing (retruing) wheels is a difficult job which you should
definitely leave to your WHEELER bicycle dealer.
a
b
c
d
66
e
f
g
h
d
e
f
g
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