The following study investigates the feasibility of development for an Electro-Hydraulic Actuator (EHA), to be implemented as rider assistance system for motorcycle purposes. The efforts of the actuator ensure the vehicle body to lean on one side and exploit the cambering effect to correct the trajectory on the road. The initial objective is to recreate an adequate model of the vehicle to estimate the range of forces, possibly generated during the ride, that the actuator will deal with. In a second moment, the study focuses on the preliminary design of the hydraulic circuit, to define the most suitable choice for each component.