Steering gear middle position: Steering box position is simply the fact that the steering wheel is centered when the vehicle is traveling down a straight and level road. Assuming that the steering wheel stays in the same position when you let go of the wheel (in other words, the car is not pulling), then steering center is controlled by the front and rear toe settings
Maximum turn: The measurement of distance between the center line and max steer (left and right) or full lock.
Parallelism: Parallelism is when you have 2 axles and it takes the toe difference’s between both axles.
Axle offset: Axle offset is how axle centres are in relation to the centre line of the vehicle.
Toe out on turn: The toe-out on turns is the angle of the inner wheel to the outer wheel when negotiating bends. The steering is constructed so that the angle of the wheels to one another changes with an increased steering angle.
KPI: The angle formed by a line drawn through the upper and lower pivot points of the steering axis and a vertical line as viewed from the front