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
Roadster (bicycle) due to the resurgence in the bicycle as local city transport where the roadster is ideally suited due to its upright riding position, ability to carry shopping loads, simplicity and low maintenance. In the United Kingdom, there are a number of bicycle manufacturers (such as Pashley Cycles) which make updated versions of the classic roadster and many more are imported from the continent, such as those from Dutch manufacturers such as Royal Dutch Gazelle. They are popular as student transport at universities, especially at Cambridge and Oxford, and are increasingly seen in other British cities, including London. In Australia, there