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Page last updated at 06:08 GMT, Monday, 13 July 2009 07:08 UK

'E-Rockit' hits German fast lane

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A Berlin inventor has come up with an electric bike which you power by pedalling that can reach speeds of 50 mph.

Stefan Gulas has developed a system that amplifies the effort you put in by a factor of 50, meaning you can accelerate quickly and maintain high speeds with very little effort.

Steve Rosenberg reports.

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