The development of Active Safety System technologies is an emerging topic in regard to Powered Two-Wheelers (PTW’s). In the wake of new technologies available, many governments are legislating in vehicle safety, and this is prompting the manufacturers of PTWs to innovate their active safety devices. The main issue in designing stability control systems for PTW’s lays in the different and complex driving dynamics in comparison to four-wheeled vehicles. The present work analyses the effects of a longitudinal Traction Control System on the dynamics of a PTW in cornering conditions, ie when the lateral dynamics arise. Following a model-based design approach, the behaviour of a PTW in cornering can be described with sufficient accuracy if both the longitudinal