Earlier, a methodology for the engineering calculation bracket springs with curved regiments (SPRk) was described and an example of such a calculation was applied with respect to the spring of the rear suspension of the KamAZ car cab [1, 2]. As preliminary studies have shown, the accuracy of the calculation of the SPRK significantly depends on the choice of the initial conditions for such a calculation and the magnitude of the summation step when replacing integration by summing small increments [3 – 5]. Therefore, it seemed advisable to evaluate the influence of the mentioned conditions on the results of calculating the same SPRK with their variation.The purpose of such comparative calculations was to develop recommendations for carrying out engineering calculations of SPRk with the least laboriousness with accuracy that meets the requirements of practical application. Since the calculations were carried out as comparative, and as a result, their accuracy was determined as the relative value of the deflection of the SPRK to the deflection of the spring, calculated by the method conventionally taken as the initial one, the absolute value of the initial data underlying the calculation could be chosen pretty much arbitrary. The calculations below are performed in relation to the SPRk designed for suspension of wheels of a heavy truck, the springs of which are made of steel 60С2ХФА.The calculated SPRk has a canvas and shelves of constant thickness, and the radius of curvature of the shelf, which was used for the calculation, is constant over its entire length [6, 7, 15]. Only its own deflection of the shelf was subject to calculation, since it is precisely the accuracy of calculating its value that determines the accuracy of calculation of the entire spring [8 – 10, 16, 17].