The pulley technique in a very CVT is made of two pulleys, one connected to the engine and the other towards the transmission. The two pulleys are connected by a belt or chain. The pulleys are shaped like cones, and their diameters may be adjusted to change the gear ratio. https://gearbox-cvt37278.thenerdsblog.com/38569961/gearbox-cvt-no-further-a-mystery