As the space concerning the pulleys and the length from the belt doesn't improve, the two pulleys need to be adjusted (one particular more substantial, another scaled-down) at the same time to maintain the correct amount of tension over the belt. Very simple CVTs combining a centrifugal travel pulley which https://gearboxcvt97429.thezenweb.com/gearbox-cvt-things-to-know-before-you-buy-70671429