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The coefficient of drag of the solid disc wheel is higher than the spoke wheel, therefore the net force on the wheel goes up as the drag coefficient goes up. The rear wheel does not have a significantly greater effect over a spoke wheel, because it is shrouded by other motorcycle parts [rear fenders, chain guards, saddlebags etc]. The front wheel is a different matter because as well as an increase in force on the front wheel, a solid front wheel also moves the center of pressure forward on the motorcycle, which may make the motorcycle harder to control in cross winds.

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13y ago

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