As the gap between the pulleys and the length of the belt doesn't change, each pulleys need to be adjusted (1 even bigger, another more compact) simultaneously to take care of the correct number of rigidity over the belt. Straightforward CVTs combining a centrifugal travel pulley with a spring-loaded pushed https://gearboxcvt08429.bloggip.com/32729140/not-known-details-about-gearbox-cvt