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The Tweel is an experimental tire design developed by the French tire company Michelin. Its significant advantage over pneumatic tires is that the Tweel does not use a bladder full of compressed air, and therefore it cannot burst nor become flat. Instead, the Tweel’s hub connects to flexible polyurethane spokes which are used to support an outer rim and assume the shock-absorbing role of the compressed air in a traditional tire.

http://en.wikipedia.org/wiki/Tweel

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