Steering, Rack and Pinion

The majority of modern cars use a steering system known as rack and pinion. This consists of a steering wheel shaft connected to a pinion gear, which when turned, meshes with a rack, or linear gear. This toothed rack is linked at its ends to the steered wheels with tie rods. As the pinion rotates, it moves the rack from side to side, moving the steering linkage and causing the wheels to pivot left or right. Rack-and-pinion setups are more precise than recirculating ball-type units.