Its not a motorized bike, but it uses the Friction drive roller system on the rear 5th wheel.  My attempt at creating a Smith/Briggs & Stratton Motor
Tom Bartlett

Its not a motorized bike, but it uses the Friction drive roller system on the rear 5th wheel. My attempt at creating a Smith/Briggs & Stratton Motor

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Album
Variations on the ZipCycle Theme
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Tom Bartlett
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