optibelt RB Sections: PH; PJ; PK; PL; PM Dimensions: Belt lengths depend on the section. V-ribbed pulleys: wide range of standard sizes special pulleys on request The ribbed belt combines the high fl exibility of fl at belts with the high performance of V-belts. The V-shaped parallel ribs are made from a wear-resistant rubber compound. The high strength tension cord is designed for the many applications of the ribbed belt. It is embedded in a rubber adhesive mixture and covers the entire width of the ribbed belt. Fibre reinforced, wear- resistant rubber compounds ensure quiet operation, oil and heat resistance and a long belt life. Advantages