An active steering assistant (ActiSA) system for powered two wheelers is introduced in this work, with the aim of enhancing the stability and safety of PTW. The proposed technology is alternative to steer-by-wire systems, which have a number of safety issues related to the removal of the mechanical connection between the handlebar and the front frame, and gyroscopic stabilizer, which tend to be heavy, expensive and energy-intensive. The paper illustrates the design and realisation of a steering assistant prototype and the integration in a light electric powered two wheeler. The prototype features an electric motor that provides the (assistant) steering torque to the front frame, which adds to the torque applied by the rider; a custom-steering torque sensor, aimed at monitoring the rider's effort on the handlebar; and a number of off-the-shelf sensors, which monitor the vehicle motion – steering angle, suspensions travel, angular velocity and accelerations of the main frame, rear wheel spin and GPS. Results from functional tests and performance assessment are also discussed.