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39
The Wheels
There are three valve types in general use on todays bicycles
Dunlop or Woods valves, the usual valves
Sclaverand or race valves: This type is nowadays used on almost all
types of bicycles. It is designed to withstand extremely high pres-
sures
Schrader or car valve: This is an adapted car tyre valve which is mainly
used on mountain bikes.
These three valve types are fitted with a plastic cap to protect them
from dirt. The car valve can be inflated with a suitable pump directly
after removing the protective cap.
Tyres with car valves can conveniently be inflated at car filling stations
with a compressed air dispenser. A compressed air dispenser must be
used very carefully as you may otherwise overinflate the tyre. It might
burst. To let out air press the needle in the centre of the valve by using
e.g. a spanner/key.
Hand pumps are often unsuitable for inflating tyres to the necessary
pressure. A better choice is a stand or foot operated pump equipped
with a manometer which enables you to check the pressure at home.
Your STEVENS dealer has adapters for all valve types. They allow you to
inflate any type of inner tube at the filling station.
Replace tyres with a worn tread or brittle or frayed sides. Dampness and
dirt penetrating the tyre can cause damage to its inner structure. Re-
place spoilt rim tapes immediately. In the extreme case, the inner tube
may suddenly burst!
Conversion table for tyre pressure psi in bar
psi bar psi bar psi bar
30 2.1 70 4.8 110 7.6
40 2.8 80 5.5 120 8.3
50 3.5 90 6.2 130 9.0
60 4.1 100 6.9 140 9.7
With race valves you first have to undo the small knurled nut a little and
press it in carefully until air starts to escape. 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.
Danger:
Treat your tyres well, in
particular avoid sharp edg-
es where possible! Never
inflate your tyres beyond
the maximum permissible
pressure, otherwise they
might burst or come off the
rim during the ride. Risk of
falling!
Danger:
Always ride your bicycle
with the prescribed tyre
pressure and check the
pressure at regular inter-
vals.
40


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