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psi bar kPa
80 5.5 550
90 6.2 620
100 6.9 690
110 7.6 760
120 8.3 830
130 9.0 900
140 9.7 970
a
b
c
d
The tires must be inflated to the proper inflation pressure
to provide an optimal compromise between smooth run-
ning and riding comfort. Properly inflated tires are also
more resistant to punctures. An insufficiently inflated tire
can easily get pinched (“snakebite”), when it goes over
a sharp kerb.
The air pressure recommended by the manufacturer is
given on the tire side or on the type label
(a)
. The low-
er of the two pressure specifications makes for better
cushioning for lightweight riders and is therefore best for
cycling on a rough surface. Rolling resistance on level
ground decreases with growing pressure, but so does
comfort. Highly inflated tires are therefore most suitable
for heavy riders and for riding on tarred roads. Therefore,
adjust the pressure to your weight and your riding habits.
Inflation pressure is often given in the old system of
units, i.e. in psi (pounds per square inch). The table
(b)
gives the most common pressure values in terms of both
systems.
Clincher and folding tires and rim alone are not able to
hold the air. Therefore, an inner tube has to be placed
inside the tire to retain the air pressure.
The rims of clincher and folding tires require, in general,
a high-value rim tape. This rim tape protects the inner
tube from the braking heat which could make the tire
burst.
G
Replace tires with a worn tread or with brit-
tle or frayed sides. Dampness and dirt pene-
trating the tire can cause damage to its inner
structure. The tube might burst. Risk of an accident!
G
If you mount a new tire with another size than
the standard tire mounted, it might be possi-
ble that the clearance between the front of
your shoe and the wheel will be reduced when you ride
at reduced speed. Risk of an accident!
G
Treat your tires with care. Always ride your
bike with the prescribed tire pressure and
check the pressure at regular intervals, at
least once a week
(c)
. Riding with too low or too high
air pressure may make the tire come off the rim or burst.
G
Clincher and folding tires allowing an infla-
tion pressure of five bars or more have to be
mounted on hook bead rims, identifiable by
the designation “C”.
G
Observe the maximum pressure value of the
rim. The pressure is dependent on the tire
width. You can find the values in the oper-
ating instructions of the rim or wheel manufacturer on
this MERIDA CD-ROM.
h
Please note that a pedelec weighs more and
that your usual tire pressure may be insuffi-
cient. A higher pressure gives a better riding
stability and reduces the risk of a puncture. The mini-
mum and maximum pressure (in bar or PSI) is indicated
on the tire side.
64


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