The pulley method in a very CVT includes two pulleys, just one linked to the motor and another for the transmission. The 2 pulleys are linked by a belt or chain. The pulleys are shaped like cones, as well as their diameters could be modified to change the gear ratio. https://waylonikihe.blogdeazar.com/32985019/the-5-second-trick-for-gearbox-cvt