50
An exception to this is the tubeless systems for mountain bikes. In this case, the
rim and tire hold the air without a tube.
If your bike is equipped with tubeless tires, please read the manual of the
wheel/tire manufacturers, before using them.
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 both
systems.
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
Treat your tires well, in particular avoid sharp edges where possible. Never
inflate your tires beyond the maximum permissible pressure, they might
burst or come off the rim during a ride, this can lead to an accident!
!!
There are three valve types (a) in general use on FELT bikes:
1 Schrader or car valve: This is an adapted car tire valve which is mainly used on
mountain bikes.
2 Presta (road bike) valves: This type is nowadays used on almost all types of
bicycles. It is designed to withstand extremely high pressures.
3 Dunlop or Woods valve, this is an older and rarely used valve type.
All three valve types come with a plastic cap to protect them from dirt. The car
valve and the Dunlop valve can be inflated with a suitable pump directly after
removing the protective cap.
With Presta valves, you first have to undo the small knurled nut until it stops (b) and
depress it carefully until air starts to escape (c). With this valve type it occasionally
happens that the knurled nut is not screwed down properly after adjusting the tire
pressure, and air can slowly leak out (d). Check the nut is tightened and seated
in its stem.
Tires with Schrader valves can conveniently be inflated at car filling stations with a
compressed air dispenser.
1 2 3
a b c d
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