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The rim
of a conventional wheel is placed in compression by the tension in the spokes.
To make the rim-spoke system a light-strong structure and reduce the rotational
kinetic energy and inertia of the wheels, the rim is frequently fabricated
from a light alloy extrusion. This construction also provides rim
surfaces on which the brake friction material can act.
The rim holds the
tire and tube as shown in the diagram. A lip on the inside of the outer
edge of the rim provides a seat for the tire bead and stabilizes the tire against
blow-off. The inner-tube retains the compressed air that acts as a 'suspension'
medium for the outer tire. Adjustment of the tire pressure influences
the road shock adsorption capability of the tire and its rolling resistance.
The
tire tread is selected to minimize the rolling resistance on
a particular surface type and provide the tire/ground friction forces required
for maneuver. |
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