Torsion bars are components of the suspension system in motor vehicles, widely used across various vehicle categories due to their simplicity, durability, and compactness. They are most commonly found in off-road vehicles, SUVs, pickup trucks, and light commercial vehicles, where they are valued for their ability to withstand heavy loads and demanding terrain conditions. Torsion bars were also frequently used in passenger cars, especially by European and Japanese manufacturers, in the mid-20th century. In the conceptual design phase, most vehicle parameters are unknown. This paper presents a procedure for the automated selection of the torsion bar radius using the "Simulated Annealing method". The radius is chosen to minimize the torsional vibrations of the bar, and its verification is carried out by calculating the safety factor under rigorous operating conditions.