Pedal-drive tractors do not have a hydraulic transmission like hydrostatic models, and they require shifting when changing between forward and reverse. Pedal-drive tractors use a continuously variable transmission (CVT) to vary ground speed depending on how hard the drive pedal is pressed. Tight-turning, "zero-turn-radius" riders use a dual hydrostatic-drive system to infinitely vary ground speed and allow a narrow turn radius by varying power to each rear wheel independently.
Gear-drive tractors involve shifting, clutching, and a distinct set of speed ranges. Hydrostatic-drive tractors let you smoothly increase or decrease ground speed infinitely with a lever or foot pedal. Categorized by the drive system (engine and transmission), which controls a tractor's direction and ground speed.
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