New Bike Transmission Design

Bike designers resurrect a 500-year-old idea to change the way people pedal

n the late 1990s, Donald Miller was creating “unsafe and impractical” low-profile lie-atop prototype bicycles in his machine shop (that is, his garage). “I just wanted to build a more efficient bike,” says the San Diego cyclist and former realtor turned inventor. Eventually, Miller instead shifted his focus to the drive train, convinced that the traditional chain-and-gear system was the primary factor holding back the evolution of the two-wheeler.

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