Some cone CVT models use two rollers.[23][24] In 1903, William Evans and Paul Knauf applied for a patent on the continuously variable transmission making use of two parallel conical rollers pointing in reverse Instructions and related by belts that may be slid along the cones to differ the transmission ratio. https://gearbox-cvt14825.blogthisbiz.com/39349622/gearbox-cvt-things-to-know-before-you-buy