aknaten
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There is a wheel/tire by Britek Tire and Rubber that promises to eliminate flats and return energy back to the wheel after hitting bumps in the road, improving mileage. The automotive version of the ERW is said to not only eliminate flats, but also improve fuel efficiency and performance. It's being tested on bicycles now.
http://newatlas.com/airless-energy-return-wheel/24797/
http://newatlas.com/airless-energy-return-wheel/24797/