Some cone CVT designs use two rollers.[23][24] In 1903, William Evans and Paul Knauf utilized to get a patent on a repeatedly variable transmission working with two parallel conical rollers pointing in reverse directions and connected by belts that could be slid along the cones to differ the transmission ratio. https://gearbox-cvt14691.prublogger.com/31920499/the-best-side-of-gearbox-cvt