The article discusses the features of loading the supports bearings of the rolling-cutters drill bits, taking into account the cutting structures location along the conesrow. It is known that the force P on the rolling-cutter tooth increases and reaches its maximum value at the interaction angle φe, which is accepted as the main characteristic of the cutting structures element interaction with the rock. To link this angle with the cone design, the φe value is divided by the angular step θ, i. e. the relative value φ0 is accepted. To determine the dependence of φ0 on the factors determining it, a fractional-factorial experiment was planned for implementation at the AI-4 facility. In accordance with the experimental plan, 25 experiments were carried out when drilling marble with die yield strength of 650 MPa. Each experiment was oscillographically recorded and 15...18 oscillograms of the force P were randomly taken for processing, according to which the average values of φ0 were determined. A total of 400 oscillograms were processed. To perform the design calculations, the article proposes a statistical method for determining the expected values of ij . The method is based on the results of the analysis of bench determinations of gear ratios determined by the number of rack teeth formed by each rolling-cutter tooth. The methods presented in the article served the basis of a new technical solution for the placement of cutting structures in the rolling-cutter teeth rows, which provides a significant increase in the uniformity of loading of the bearings of the rolling-cutter drill bits.