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
Belt-driven bicycle which allow riders of belt-driven bicycles to shift easily) are constantly innovating and introducing new designs such as the Shimano Alfine 11 and Fallbrook Technologies’s NuVinci. Other major internally geared hub makers include SRAM, Sturmey-Archer and Rohloff. Another option to provide gears is using a bracket-mounted gearbox like the Pinion P.18. manufacturers of belt-driven bicycles or belt drives include: Belt-driven bicycle A belt-driven bicycle is a chainless bicycle that uses a toothed synchronous belt to transmit power from the pedals to the wheel. The belts are typically made by the same manufacturing companies that produce timing belts for automobiles, machinery,