So Philliebot was a fail, but this chainless bicycle serves as proof that UPenn doesn't always come up short. The Alpha Bike, designed by a group of engineering students, contains an entirely internal drivetrain that allows riders to switch between fixed-gear and multi-gear setups. The simple switch is enabled by an electronically controlled clutch, part of the Switchable Integrated Free-Fixed Transmission (SWIFT), discreetly hidden in the bike's frame. Populating the front hub are a drum break and a dynamo, which juices the bike's electronics -- the back hub contains a three-speed gear set, put in motion by a simple push-pull cable. When the front wheel starts rolling, an LED screen mounted in the carbon fiber handlebars is illuminated, displaying time, cadence, and speed, among other things -- this data and more is stored on an accessible SD card. As of now, the bike is still a prototype, but if you start saving now, you might actually have enough scratch to buy one when it comes to fruition.Source URL: http://ghubar-magazine.blogspot.com/2011/04/alpha-bike-concept-free-wheeling-fixie.html
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