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"Jump Bike", an ordinary looking MTB with special eccentric hubs that let you propel the bike by bouncing up and down. The hubs have a variable degree of eccentricity, from 0 to 45 mm, selectable by a handlebar control. It has a normal chain drive too, and front and rear disc brakes, so it can be used as a normal bike.
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Copyright © 2002, Sheldon Brown
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