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Tire
pressure has an important effect on rolling resistance as shown in the diagram.
Curves A, B are for automobile wheels rolling on smooth hard surfaces. The
limits, C, show the rolling resistance range that is experienced with 28 x
1.5 inch bicycle tires with change in the road surface conditions. Curve D
is for a 27 x 1.25 inch tire on a smooth, hard road and curve F shows the same
tire on a medium rough, hard road. Curve E shows the effect of wheel diameter
as this is for a 16 x 1.38 inch wheel on a medium rough, hard road. The
data points are for a 26 x 1.25 inch tire tested on steel rollers. |
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