Pressurized ATF acts over the movable 50 % with the pulley, modifying its diameter. “As a result,” claimed Maldonado, “a CVT transmission frequently improvements gear ratios as the two movable pulley halves slide with a shaft, when one other 50 % in the pulley continues to be locked in position.” https://gearbox-cvt86284.ttblogs.com/13840165/5-easy-facts-about-gearbox-cvt-described