ContiTech V-Ribbed Belt - 6PK1153, 6 Ribs - Fan Belt Alternator, Drive Belt. Manufacturer: ContiTech Part Number: 6PK1153 6 Ribs Weight [kg]: 0.122 ContiTech V-Ribbed belts offer improved flexibility which increases efficiency, as less energy is lost from the internal friction of continually bending the belt. This added efficiency leads to a reduced heating effect on the belt, meaning a cooler-running belt that lasts longer in general. ContiTech Belts are not ground but are produced by the molding process. That ensures optimal dimensional stability, a good service life and smooth running. They retain their flexibility throughout their operational life. Signs that a V-Ribbed Belt might need changing: - Screeching or squealing noise - Difficulty staying on pulleys