Belt-driven bicycle with a compact design that, like STRiDA, featured a belt drive. Other folding-bike manufacturers that have implemented a belt drive include U.S. company Bike Friday and Netherlands-based Bernds. In 2007, Gates Corporation developed a high-modulus synchronous belt and sprocket system called the Carbon Drive System. The belt’s pitch allowed for lower tension requirements to help prevent skipping. Lightweight, patent-pending sprockets have mud ports, openings under each tooth, which work to slough off debris. In 2009, an increasing number of bicycle companies, including Trek and "f"8 Cycles, offered belt-driven bicycles. While builders initially focused on single-speeds and internal hubs, in early
Trek Bicycle Corporation Void" and refers to Trek's proprietary process for creating carbon structures that exceed aerospace standards. Weighing only , the 5500 frame was the world's lightest production road frame. To make room for its new OCLV manufacturing facility, Trek expanded its Waterloo headquarters again to a total of . 1992 marked another first for Trek: its first full suspension mountain bike, the 9000-series, which featured Trek's T3C (travel is three times compression) suspension system. In 1993 Trek introduced its first OCLV Carbon mountain bike frames, the 9800 and the 9900, which at was the world's lightest production mountain bike frame. In