Shorter belt for smaller pullies. Putting a smaller pully you have to shorten the belt to keep preload on your charger! Up to 65mm pullies or bigger. For all G60 without AC. Manufacturer Information about the manufacturer BAR-TEK BAR-TEK Motorsport GmbH Im Rauschen Auel 3, 51491 Overath-Brombach, Germany info@bar-tek.com