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The Figure-Eight Drive is a novel handcycle drivetrain designed specifically for the developing world. Utilizing a retro-direct chain configuration, the system offers users two forward motion gear ratios that can be switched between by changing the direction of pedaling. Movement in the reverse direction can be achieved by rotating the steering column 180 degrees. The drivetrain was designed at the Massachusetts of Institute of Technology and was successfully implemented and tested during the summer of 2007 at the Association for the Physically Disabled of Kenya in Nairobi, Kenya, where it is now in production. The Figure-Eight Drive can be constructed entirely out of conventional bicycle components already found on handcycles across the developing world. It has been well received by handcycle users and manufacturers because of its simplicity, low-cost, and significant improvement in mobility and usability compared to current single speed and derailleur handcycles currently in production.
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