Dayco is a global leader in the research, design, manufacturing and distribution of essential engine products, drive systems and services for automobiles, trucks, construction, agriculture and industry. Top performaning idler and tensioner pulleys are a result of advanced automotive technologies employed in materials research, design engineering, and manufacturing of our pulleys. In addition to our spun steel pulleys, Dayco also provides specially formulated glass-filled polymers to ensure a high strength, wear-resistant plastic pulley designed to replace serpentine and V-belt idler and tensioner pulleys.