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The currently available computer aided design tools significantly accelerate the design process. They enable creation of 3D structures and elements and allow checking their strength or other properties with the use of the different analytical and simulation modules. Selection of appropriate elements in terms of strength and cost is important for any engineering project. The above-mentioned tools for designing and performing analyses were used to select an appropriate shaft to drive the toothed belt. Analyses were needed to verify the designed shaft length and mounting method. The tested shaft was 1200 mm long, supported at one end. Shafts with different geometries, i.e. solid and hollow with different diameters were selected, taking into the consideration the design assumptions. The weight and rigidity of the system were considered relevant and were investigated. The paper presents the input parameters of the analysis and the simulation outputs. These are compared with the results of analytical calculations. The research outputs include the conclusion that while offering a higher rigidity, hollow shafts involve mounting design challenges.