Stringbike
Bicycle drive train using ropes and pulleys / From Wikipedia, the free encyclopedia
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A string-driven bicycle or stringbike is a bicycle that uses an external chainless rope and pulley drive system instead of a traditional bicycle chain and sprockets.[1][2][3][4] The mechanism was commercialized by Hungarian Stringbike Kft which presented models in 2010 with a 19-speed system with no duplicate gears and having a 350% gear range.