Hmm, in dem Comments steht, daß das eine Rad hinten den Schwerpunkt verlagert, und die 'Windmühle' ist zum Ausgleich des Drehmoments?
The roll is compensated with the one wheel in the air. The weight of this wheel changes the centre of gravity of the unicycle. But to move this wheel in the air you have to compensate for the moving force. There are the two turning wheels for. They compensate the force of moving the one wheel in the air.