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 subsidiary of Roth Corporation, a Milwaukee-based appliance distributor. In early 1976, with a payroll of five, Trek started manufacturing steel touring frames in Waterloo, Wisconsin, taking aim at the mid to high-end market dominated by Japanese and Italian made models. Trek built nearly 900 custom hand-brazed framesets that first year, each selling for just under $200. Later that same year Trek Bicycle was incorporated. In 1977, Penn Cycle in Richfield, Minnesota became the first Trek dealer in the world. Within three years, Trek sales approached $2,000,000. Hampered without additional manufacturing capacity, Trek sales plateaued in the late 1970s. In just