Hubless Bicycle
Yale engineering students invent spokeless bicycle wheel
Yale mechanical engineering students wanted to build a bicycle unlike any other, so they developed a single-speed, hubless rear wheel designed bicycle without spokes, using "two cranks and two bottom brackets to gear up the ratio; it goes from (IIRC) 53 to a 13, which is connected to the second crank and another 53 which connects to the rear hub."
The rear hub is just a normal ratcheting rear hub that they mated to a belt pulley.
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