The 'Stringbike' totally rethinks the traditional drivetrain of a bicycle. According to the Stringbike creators, the placement of the chain and gears on one side of the frame on a traditional bike causes a subtle, although not unnoticeable, asymmetrical pedaling experience.
The Stringbike virtually eliminates these subtle toque differences by creating a totally symmetrical drivetrain. It's essentially like having two chains on each side, both connected to the rear hub - only it's high-strength cord, not chain. Better yet, there's no grease.
(thanks Cora)
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