Rim Trueness, Spoke Tension - Canyon road bike Manual

72 WHEELS TYRES AND INNER TUBES
Please note that the valves have different diameters.
Only use inner tubes with valves matching the rim.
Using a wrong valve may cause a sudden loss of air
pressure and hence throw you off your bike.
With this valve type it may happen that the valve
body is not screwed in properly and that air leaks out
slowly. Check the seat of the valve body in its stem.
Hand pumps are often unsuitable for inflating tyres
to high pressure. A better choice is a stand pump
equipped with a manometer which enables you to
check the pressure at home. There are adapters for
all types of valves which allow you to inflate a Sclav-
erand valve at the filling station.
With race or Sclaverand valves you first
i
have to undo the small knurled nut a little
and press it in carefully until air starts to escape.
Always ride your bicycle with the pre-
!
scribed tyre pressure and check the pres-
sure at regular intervals, at least once a week.
Make sure the valve diameter matches the
!
hole in the rim and the valve is always in
upright position!
Replace tyres with a worn tread or brittle
or frayed sides. Dampness and dirt pen-
etrating the tyre can cause damage to its inner
structure.
Unscrewing the plastic cap
With race or Sclaverand valves the valve must be unscrewed
Valve adapter
Replace spoilt rim tapes immediately.
Exception: With Mavic system wheels you
do not need rim tapes.
In the extreme case damage to the tyres
may make the tubes suddenly burst,
throwing you off your bike!
RIM TRUENESS,
SPOKE TENSION
The spokes connect the rim to the hub in the mid-
dle of the wheel. An even spoke tension makes for
the true running of the wheel. If the tension of indi-
vidual spokes changes, e.g. as a result of riding too
fast over a kerb or due to spoke breakage, the tensile
forces acting on the rim become unbalanced and the
wheel will no longer run true. The functioning of your
Canyon may even be impaired before you notice the
untrue wheel by its wobbling. With rim brakes the
sides of the rims also serve as braking surfaces. An
untrue wheel can impair your braking power.
Loose spokes must be tightened at once.
!
Otherwise the load on the other spokes
and the rim will increase.
Truing (retruing) wheels is a difficult job
!
which you should definitely leave to an ex-
pert!
RIMS AND SPOKES WHEELS
Check of wheel trueness with brake pads
Truing stand
Do not ride with untrue wheels. In the case
of extreme side-to-side wobbles the brake
pads of road bike brakes can miss the rim and
get caught in the spokes! This normally results
in an immediate blocking of the wheels, possibly
throwing you off your bike! It is therefore advis-
able to check the wheels for trueness from time
to time. for this purpose lift the wheel from the
ground and spin it with your hand. Watch the gap
between rim and brake pads. If the gap varies by
more than a millimetre, you should ask a skilled
mechanic to true up the wheel.
73