A device for pneumatically driving a rotor (1) in a balancing machine, having at least one drive nozzle (8), which is connectable to a compressed-air line and which serves for generating a driving air stream which can be directed onto the rotor (1), and at least one braking nozzle (8), which is connectable to a compressed-air line and which serves for generating a braking air flow which can be directed onto the rotor (1) in a direction opposite to the direction of rotation of the rotor (1), said device also having a base plate (3) which is arrangeable with a spacing to the rotor (1) and on which the nozzles (8) are movably arranged, such that the spacing between the nozzles (8) and the rotor (1) is adjustable.