Tire is an important constitutive element for agricultural vehicles, due to its multiple functions: ensure proper adhesion to the rolling track, safety and resistance to high-speed moxement, attenuate the shocks caused by uneven rolling tracks, take the loads distributed on wheels, contribuie to the comfort of passengers or operators. Through tire contact area, agricultural vehicle and rolling track are linked together. In tire contact area are applied the traction forces for vehicle propulsion, braking, normal reactions, etc. In this paper was dv'eloped a complex mathematical model to generate the contour of the contact area between the tire and rolling track and for the calculus of the surface of contact area, depending of tire geometry and on the deflection characteristics of the tire, which allows the exploitation of pneumatic tire for agricultural land vehicles. Theoretical studies and experimental researches dexeloped within this paper emphasized the fact that 2-D contact area is elliptical when tire deflection is small, but it becomes rectangular with curved edges as the deflection increase. The model predictions were verified by means of the experimental results obtained using the tires of an agricultural trailer. Simulation studies indicated that the elaborated equations can be useful for predicting the details of contact geometry under varying load, inflation pressure, and tire geometry conditions.