Dayco Narrow Serpentine Belts are designed for power transmission on multiple-accessory drives. This is the "cogged" version of the revolutionary multi-ribbed belt first developed by Dayco for the 1979 Ford Mustang. The Dayco Serpentine Belt has a multiple-rib design provides better belt-to-pulley contact for less slippage, so it lasts longer than conventional V-belts. Dayco Serpentine Belts have "Multiple ribs" that also eliminate the need for "matching", and allow "controlled slippage" in shock overload situations, such as when the AC compressor kicks in. Today, as then, this Dayco Serpentine belt sets the industry standard. The transverse groove design of the Dayco Serpentine Belt runs cooler (up to 50¿F), and dramatically reduces rib cracking, thereby increasing the life of the belt by at least 40%. The grooved design of the Dayco Serpentine Belt provides flexural stress relief, for increased flexibility in both normal and backside bending. The grooves also render the belt less susceptible to environmental factors such as dust and splash-induced slip. The superior manufacturing technology of the Dayco Serpentine Belt uses a rubber backing that maximizes load-carrying capability and minimizes the noise that is often associated with the competition's belts. Torque-carrying capacity equals or betters conventional multi-rib belts.