(Pic) The Chainless Stringbike
A design team from Hungary has created a system that uses steel wires and pulleys instead of the traditional chain drive.
The Stringbike is an interesting redesign of the traditional bicycle chain drive. A design team from Hungary has created a system that uses steel wires and pulleys which offers seamless shifting, and a cleaner operation than greasy chains.
Popular Science reports:
The position of the pedals determines the position of the discs, so that they swing in opposition — one is always pulling the bike forward, and the other lags behind. This allows a continuous transmission change, which could help a rider navigate winding streets, because you can more easily control the transmission without having to shift gears.