Product Details: The Dayco 39.08" Synthetic Rubber V-Belt is the perfect choice for your small diameter pulleys. This belt is designed to provide a high friction coefficient and excellent resistance to repeated flexing. It also offers a high transmission ratio, greater friction and less slippage, and a longer belt life. With a circumference of 39.39" and an effective length of 39.08", this belt is sure to provide the performance you need. FleetPride is your First Click in Heavy Duty®.