Operating instructions

a
Riding with too low pressure can lead to
bottom out resulting in a crack or breakage
of the carbon rim.
Ination pressure is often given in the old system of
units, i.e. in psi (pounds per square inch). The table (a)
gives the most common pressure values in terms of
both systems.
Clincher and folding tyres 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.
Exceptions to this are the tubeless tyres and tubular
tyres. In the case of tubular tyres that must be glued
on the rim the tube is already integrated into the tyre
and can be neither removed, nor patched in the case
of a puncture. This type of tyre requires special rims
without rim anges. For more information read the
respective instructions, before starting any work with
such kind of tyres.
Valves
There is only one valve type in general use on
AX-Lightness and engage wheels: The Sclaverand or
Presta valve that is designed to withstand extremely
high pressures.
It has a plastic cap protecting the valve from dirt (b).
You rst have to undo the small knurled nut a little (c)
and depress it carefully until air starts to escape (d).
Check the nut is tightened and seated in its stem, oth-
erwise air may slowly leak out. It can be hard to inate
tyres to the necessary pressure by using hand pumps.
It is much easier with a foot-operated or a track pump
equipped with a pressure gauge (e).
G
Replace tyres with a worn tread or with brit-
tle or frayed sides. Dampness and dirt pen-
etrating the tyre can cause damage to its
inner structure. The tube might burst. Risk
of accident!
G
Clincher, folding and tubeless tyres allow-
ing an ination pressure of 5 bars or more
have to be mounted on hook bead rims,
identiable by the designation “C“. If you
are in doubt or if you have any questions,
contact your AX-Lightness and engage
dealer.
G
Mounting a new tyre of another size (f)
might possibly cause the tip of your shoe to
touch the front wheel while steering. Risk
of accident!
G
Treat your tyres with care. Never inate
your tyres beyond the maximum permis-
sible pressure, otherwise they might burst
or come o the rim during the ride. Risk of
accident!
G
If you mount wheels with carbon rims (g)
on your road racing bike, it may be possible
that you have to change the brake pads, as
conventional brake pads often do not pro-
vide the desired braking eect. For more
information read chapter “The brake sys-
tem” of the present user manual. If you are
in doubt or if you have any questions, con-
tact your AX-Lightness and engage dealer.
A
Always ride your bicycle with the prescribed
tyre pressure and check the pressure at reg-
ular intervals (h), at least once a week.
I
Observe the maximum pressure value of
the rim. The pressure is dependent on the
tyre width. If you are in doubt or if you have
any questions, contact your AX-Lightness
and engage dealer.
44 45
Rims - Wheels
a
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 4.2 100 6.9 140 9.7
b
c
d
g
f
e
h