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Dayco was the first to develop the raw edge sidewall construction V-belt, which facilitated controlled slippage around pulleys.

Top Cog V-belts
Raw edge construction is combined with the Dayco patented cogged top design to ensure the top performance that todays vehicles and drivers demand. The Dayco Top Cog V-belt delivers more flexibility, and increases airflow around the belt, so it runs cooler and lasts longer than competitors’ V-belts. Three plies of neoprene impregnated fabric resist heat, oil, and grease, and a specially formulated treatment of the polyester cord provides strength, stability, and reliability.