This “Commuter Cyclists Sustainable Energy Source” is a design project from Deco Goodman that captures energy from multiple points on the bike, including seat movement, recapturing brake energy, movement from bumps and, of course, wheel movement.  It would store the power in battery storage unit inside the the rear taillight assembly and could power bike lights or other accessories.
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A piezo-electric stack is inside a shock absorbing mount so that up-and-down motion (ie. bumps, saddle movement, etc.) is captured and converted to electricity.
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