Abstract: Method for the indirect tire pressure monitoring in which there are performed a rolling circumference analysis of the tires, in which rolling circumference analysis variables (?DIAG, ?SIDE, ?AXLE) are determined from actually found and learnt test variables describing the rotation of the wheels, and a frequency analysis of the natural oscillation behavior of at least one tire in which at least one frequency analysis variable (fk) is determined, in which case an evaluation of the rolling circumference analysis (A) and the natural frequency analysis (C) and a combined evaluation (B) of both methods of analysis is performed for warning indication of tire pressure loss.