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Stevens Race - 2014 Manual

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40
The Wheels
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 val-
ues in terms of three systems.
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
The tyre and rim alone are not able to hold the air. Therefore, an inner
tube has to be placed inside the tyre to retain the air pressure. The tube is
pumped up via a valve.
An exception to this are tubeless tyres and tubular tyres. In the case of
tubular tyres which must be glued to the rim the tyre provides an airtight
design without inner tube. In case of a puncture there is no inner tube to
be removed or repaired. This particular design requires special rims with-
out rim flanges. Read if necessary the respective operating instructions
on the STEVENS CD-ROM before working on such kind of tyres.
On road racing bikes it is usual to use Sclaverand or race valves. It is de-
signed to withstand extremely high pressures
This valve is provided with a plastic cap to protect it from dirt. 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.
Hand pumps are often unsuitable for inflating tyres to the necessary pres-
sure. A better choice is a stand or foot operated pump equipped with a
manometer which enables you to check the pressure at home.
Replace tyres with a worn tread or brittle or frayed sides. Dampness and
dirt penetrating the tyre can cause damage to its inner structure. Replace
spoilt rim tapes immediately. In the extreme case, the inner tube may
suddenly burst!
Caution:
If you have a bicycle with
tubular tyres, please read the
instructions of the tyre or rim
manufacturer on the STEVENS
CD-ROM.
Danger:
Treat your tyres well, in
particular avoid sharp edges
where possible! Never inate
your tyres beyond the max-
imum permissible pressure,
otherwise they might burst or
come o the rim during the
ride. Risk of falling!
Danger:
Always ride your bicycle with
the prescribed tyre pressure
and check the pressure at
regular intervals.
… 41 …


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