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MY22B01 - 22_1.0_27.08.2021 39
Description
3.3.4 Wheel
Figure 23: Visible wheel components
1Tyres
2 Rim
3 Spoke
4 Spoke nipples
5Hub
6Valve
The wheel comprises the wheel itself, an inner
tube with a valve and a tyre.
3.3.4.1 Tyres
The tyre forms the outer section of the wheel.
Tyres differ in their tread, depending on their
intended use.
Tread
The tread has little influence on riding
characteristics on a smooth road. In this case, the
grip between the road and tyre is mainly due to the
rolling friction between the rubber and the road
surface.
Unlike cars, a pedelec will not aquaplane. The
tread contact is much smaller and the contact
pressure much higher. Theoretically, aquaplaning
will not occur until speeds of 200 km/h are
reached.
However, the tread is highly important on terrain.
In this case, the tread creates an interlock with the
ground. This is the only way possible to transmit
the driving, braking and steering forces. The tread
can also help improve control on dirty road
surfaces.
If a tyre with a deep tread is used on asphalt, this
may make an unpleasant noise when the brakes
are used In such a case, the specialist dealer
needs to replace the tyre with a new one with a
shallow tread.
Figure 24: Example: Information on tyres
Tyre pressure
The permitted pressure range is indicated on the
side of the tyre. It is indicated in psi or bars.
The tyre is only able to support the pedelec if there
is adequate tyre pressure. The tyre pressure must
be adjusted to the rider and then checked on a
regular basis.
Tyre size
The tyre size pressure range is indicated on the
side of the tyre.
3.3.4.2 Rim
The rim is the metal profile on a wheel which holds
the tyre, tube and rim band together. The rim is
joined to the hub with spokes.
In rim brakes, the outer surface of the rim is used
to brake.
3.3.4.3 Valve
Each wheel has a valve. Air is pumped into the
tyre via the valve. There is a valve cap on each
valve. The screw-on valve cap keeps out dust and
dirt.
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