In recent years many major automobile manufacturers have converted cars from geared automatic transmissions to CVT's. This is feasible because advanced technology and materials have been developed. CVT's offer smoother shifting and  improved fuel efficiency. (Examples: Nissan Altima, Nissan Murano, Dodge Caliber, and the Honda Civic Hybrid)

  A bicycle CVT offers the cyclist the same advantage as a car automatic transmission (No manual gear shifting required). It uses a high efficiency special belt design which adjusts the transmission ratio in response to grade variations as well as to changes in wind resistance. This is accomplished without requiring any action from the cyclist. It also does not require momentary reduction in pedal force when shifting gears as  required with manual (geared) transmissions (see chart). 

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William Stuhler