Dayco is a global leader in the research, design and production of transmission systems for engines and the provision of aftermarket services for automotive, construction, agriculture and industrial fields. Recently, in the automotive landscape, the pulley inlet span of the accessory belt has been particularly reduced due to the use of tensioning systems for BiSG. The span entry length has moved from a minimum value of around 75mm down to values close to 50mm. Entry span length is a fundamental parameter in defining the belt entry angle over a pulley. Higher this angle higher the risk of on noise and belt wear.