A CVT is a shiftless transmission 
that uses a belt instead of gears.
The belt is set on two pulleys
and used to send drive force 
from the engine to the rear tire.
Varying the width of the pulleys alters 
the arc traveled by the belt,
giving the CVT a nearly unlimited 
combination of “gears” to use.
There’s little vibration, low noise and no need for shifting.
