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It is noted that any variation in operating conditions has a considerable effect on the tire/road interaction. Furthermore, choosing a range of proper values for carcass stiffness is very essential for both tire safety and effective driving action. In this work, an elaborated 3D model fully compliant with the geometrical size of radial tire 185/60 R15 is worked up, for evaluating the effects of components properties and working conditions on deformation and stress/strain fields created inside the tire. For the simulation, the tire structure is assumed to be composed of tread, carcass ply, and bead. The mechanical behavior of rubber as main component of tire is described by Mooney?Rivlin material model. The comparison of the obtained results and laboratory tests demonstrates the validity and high accuracy of analysis.