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Human Power

At Paul Freedman's Rock the Bike booth, powering the sound system for the fashion show. Three people on bikes can provide a steady 200 watts of clean AC power and up to 500 watts at peak moments. Because of the way dance music works, it turns out this is plenty.


People at the San Francisco Bike Expo Saturday November 21 2009.


More on the Rock The Bike "Biker Bar" ->

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Taken on November 21, 2009