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Rolling
Resistance
The
diagram shows the speed dependence of the power consumed to overcome
the rolling resistance of a bicycle. For the tire pressures and tread
used in this test, the power lost to rolling resistance is larger than that
lost to aerodynamic drag for speeds below 10 mph (16 kph). Above this speed
the aerodynamic drag becomes the major source of power loss. The airspeed
is NOT the road speed unless the bike is moving in still air. It is
the speed of the bike relative to the air that must be used to estimate the aerodynamic
drag.
The two curves associated with walking are for different
people and show that the power required to walk at a given speed is much
larger than that required to cycle at the same speed. |
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