Canyon ROAD BIKE Manual page 46

88 WHEELS TYRES AND INNER TUBES
Tyres have to be inflated to the correct air pressure in
order to work properly. Adequately inflated tyres are
also more resistant to flats. An insufficiently inflated
inner tube can easily get pinched ("snake-bitten"),
when it goes over a sharp kerb.
The air pressure recommended by the manufacturer
is given on the side of the tyre or on the type label.
The lower of the two pressure specifications makes
for better cushioning and is therefore best for cycling
on a rough surface. Rolling resistance decreases
with increasing pressure, but so does comfort. A high
tyre pressure is therefore most suitable for riding on
tarred roads.
Inflation pressure is often given in the old system of
units, i.e. in psi (pounds per square inch). The table
gives the most common pressure values in terms of
three systems.
The tyre and rim alone are not able to hold the air (ex-
cept for tubular tyres with road bikes). Therefore, an
inner tube has to be placed inside the tyre to retain
the air pressure. The tube is pumped up via a valve.
Canyon bikes are equipped with Sclaverand or race
valves. This type of valve is designed for highest pres-
sures, but you need getting used to its handling. This
valve is provided with a plastic cap to protect it from
dirt.
Riding with too low air pressure may make
the tyre come off the rim.
Tyres allowing an inflation pressure of five
bars or more have to be mounted on hook
bead rims, identifiable by the designation "C".
Race or Sclaverand valve
Tyre pressure range
psi bar kPa psi bar kPa
80 5.5 550 130 9.0 900
90 6.2 620 140 9.7 970
100 6.9 690 150 10.3 1,034
110 7.6 760 160 11.0 1,103
120 8.3 830
Air pressure in psi, bar and kPa
Never inflate the tyre beyond its maximi-
mum air pressure. Otherwise it might burst
or come off the rim during the ride. Risk of an ac-
cident!
With race valves you first have to undo the
i
small knurled nut a little and press it in
carefully until air starts to escape.
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 slow-
ly. 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.
TYRES AND INNER TUBES WHEELS 89
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!