All these answers are correct. The "belt" is really a v shaped chain with friction material and the two pulleys get wider or more narrow allowing the belt / chain to ride farther down in the pulley or further up in the pulley. The other pulley reacts exactly opposite keep everything tight. So the drive pulley is spread apart "belt" down in the pulley then the driven pulley is all the way together or narrow making the belt ride near the outer edge you are in low gear effectively. As the pulleys change bit by bit you are moving to a higher range. Awesome transmissions especially Honda's
See stemb89
Continuously variable transmission. Rather than gears your transmission is driven by a belt. Smoother shifting, but feels kinda fake when accelerating.
= smoother acceleration and better fuel economy
continuously variable transmission
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