Gates Automotive XL - V-Belt 9270 Gates designed and produced the industry's first V-belt and is now the world's largest manufacturer of timing, serpentine and V-belts. Gates has a century-long history of providing high-quality automotive products and services. Replacement belt for the most demanding engine drives. Due to thermal forces, this variable notched belt tightens on the drive as it gets hot. This results in improved belt performance by reducing tension decay and noise. Fiber-loaded rubber stock puts more flexibility along the length of the belt, yet gives the belt greater lateral stability in the pulley. Thermally active tensile cords for maintenance-free performance when properly installed and tensioned.