Continuously variable transmission system

A continuously variable transmission (CVT) system for a small vehicle with an engine and engine shaft, a steering wheel mechanically connected to a steering plate, and a right and left rear wheel, comprising:

• a primary stage comprising a fixed center distance (FCD) pulley system with at least two pulleys, a first primary stage pulley and a second primary stage pulley, wherein the first primary stage pulley is mechanically connected to the engine or engine shaft, and the first and second stage pulleys are connected by a first belt;
• and
• a secondary stage mechanically connected to said primary stage, said secondary stage comprising an adjustable center distance (ACD) pulley system with at least four pulleys arranged in right and left pairs, each pair comprising a front and back pulley connected by a right or left second belt, wherein the back pulley of each pair is mechanically connected to the right or left rear wheels of the vehicle, respectively;
• wherein the pitch diameters of some or all of the pulleys in the secondary stage are changed in response to rotation of the steering plate, causing one of the rear wheels to speed up and the other rear wheel to slow down in a coordinated manner.