For the design of the traction calculation of transport machines the algorithm of the combined breakdown of gear ratios in the transmissions based on the dependencies that minimize the deviation speed traction characteristics from the ideal in the mean square sense. The combined breakdown of transmission increases the transport efficiency of the machines in comparison with traditional methods. The combined distribution gear ratios of gearbox increase the transport efficiency of the machines in comparison with traditional methods and can be used for practical calculations. Suggested is a simplified linearized method of combined distribution gear ratios for use as a first approximation, which might be exploited in the educational process.