When considering the power transmission system, it comes to the gearbox, which provides speed and torque conversion. Therefore, so to achieve the control of the power application, the Powertrain sub-group deals with the selection and design of the most suitable equipment. Undoubtedly, many calculations precede the decisions of the characteristics of the parts of the planetary system, which is custom made and located inside the wheel. Every racing season this team sets the goal of reconstructing the planetary gearbox, achieving a lighter version and reducing at the same time the unsprung mass of the vehicle.