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Hidden motors on bikes have been around for a few years. Feel free to add this link to the story currently in the queue,
    http://cyclingtips.com/2015/04/hidden-motors-for-road-bikes-exist-heres-how-they-work/ [cyclingtips.com]

One giveaway is to weigh the bike. Most carbon fiber road bikes are right down on the minimum weight limit, and even this lightweight motor/battery adds about 1.8kg or ~4 pounds. No serious roadie would be caught on a 20 pound bike these days...

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