A Chainless Bike - The Worlds First Tungsten Powered Bike

It features a riding position in which the cyclist doesn't sit in the middle of the bike, but is instead perched over its back wheel.

The cranks are located on that wheel, which also contains an internal gearing system. Another interesting feature is the Rapid Turning System, which when activated allows the bike's rear wheel to pivot relative to the frame – just like the front wheel does on normal bikes.

This makes sharp turns possible. The bike is being made in both regular and folding version. Reference Chainless Bike. Inventor Sean Chan