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
Wilderness Trail Bikes of Marin and to market the components that they were producing. In 1988, Patrick Seidler, began working with WTB. This new company focused on licensing technology developed by WTB to mainstream bicycle industry manufacturers. Examples of technology developed by WTB that were produced under license include designs for tires made by Specialized Bicycle Components, the Blackburn B-52 water bottle cage, geometry for the 1987 Trek Bicycle Corporation mountain bike line and the use of Greaseguard in the top-end Suntour XC Pro component group. In 2002, Cunningham and Potts ceased to be part of WTB, leaving Mark Slate as the sole