A team of mechanical engineering students at the University of Pennsylvania have spent the better part of the past year designing and fabricating the ultimate concept bike, which they've called 'Alpha.' Thanks to rapid prototyping technology, the bike was realized almost entirely at UPenn's engineering school.
Many of the innovations lie in the drivetrain: besides being fully enclosed within the frame, an electronic clutch allows the rider to switch between fixed-gear and freewheel settings. Every aspect of the bike is described in further detail on the dedicated website, but here's a handy rundown of the specs...
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