As the distance in between the pulleys plus the length in the belt would not improve, the two pulleys has to be altered (one greater, the other scaled-down) at the same time to maintain the appropriate number of tension about the belt. Very simple CVTs combining a centrifugal drive pulley https://gearbox-cvt16914.blogdeazar.com/32824938/not-known-details-about-gearbox-cvt