If you want to look really impressive on your two-wheeler, you'll want to be riding the City Electric Bicycle. At first glance, few would suspect that it houses the cutting-edge mechanics to be powered by a motor, but as you're whipping past pedestrians, they won't even have time to look.
Student designer Vojtech Sojka of the University of Technology in Brno came up with this streamlined bike model which hides its motor within the bottom bracket of the hydroformed aluminum frame. The resulting thickened shape of the cycle's skeleton was then smoothed over with slick subtle curves. You would also struggle to discover that the battery is kept within the tube bellow the seat of the City Electric Bicycle.