The elaborated methods of the calculation of the main steady-state loads balloon bus-pneumatic muffs. The offered formulas for determination of the linear voltages and force in thread of kordnyy framework from pressure of the compressed air and attached moment of the rotation at calculation of toughness of the rubber-kordnyy balloon. The got correlations can be applying at modernizations and development of the new methods of the calculation bus-pneumatic muffs.