Pressurized ATF acts to the movable 50 % in the pulley, shifting its diameter. “For that reason,” reported Maldonado, “a CVT transmission regularly changes equipment ratios as The 2 movable pulley halves slide on a shaft, though one other 50 percent in the pulley continues to be locked in position.” https://zionopnic.ltfblog.com/33112973/gearbox-cvt-an-overview