At the same time when this enter pulley(sheave) moves, feeding output pulley(sheave) also moves and comes closer towards the set output pulley which subsequently change the A part of v-shaped belt wrapped more than the output pulleys in the direction of the higher cross-sectional area with the output conical pulleys https://keeganccawt.blogoscience.com/39055686/everything-about-gearbox-cvt