Operation Manual

45
TUBE AND VALVE
The tire and rim alone are not airtight.
To maintain the pressure on the interior,
the tube is inserted into the tire. It is filled
through a valve. Riese & Müller bikes use
presta valves exclusively. Before inflation,
the small knurled nut is unscrewed and
then pressed back down into the valve. It is
normal for a little air to escape during this
process.
If the presta valve is not suciently tight-
ened, this leads to the gradual loss of air.
Check the tightness of the of the valve body
in the elongated shaft. Make sure the valve
diameter matches the hole in the rim and
that the valve stands up straight.
Hand-pumps are often not suitable for
achieving high pressure. Track pumps with a
gauge are better, as you can check the pres-
sure as you pump.
CHECKING THE TIRES
Regularly check the tires. If the tread is worn
or the edges are brittle, you should replace
them. The inside of the tire may be damaged
if is contaminated by moisture or dirt. Defec-
tive rim tape must be replaced immediately.
Damage to the tires can lead to their sudden
bursting which could be dangerous.
RIM RUNOUT AND SPOKE TENSION
The spokes connect the rim with the hub in
the center of the wheel. The uniform spoke
tension is responsible for maintaining the
concentricity of the wheel. When a spoke
breaks when running over a severe bump,
the tension of the spokes is no longer in
equilibrium. Even before the rider notices the
malfunction it is aecting your bike. The side
walls of the rims no longer run parallel to
the braking surface so braking eectiveness
cannot be ensured.
TIP!
Truing wheels is a dicult busi-
ness, which should denitely be
left to your dealer!