Steering Angle

STEERING AXIS INCLINATION
Steering axis inclination is the tilt (at the top) of the steering knuckle from vertical. It is the angle between true vertical and a line through the center of the strut and lower ball joint as viewed from the front of the vehicle.

INCLUDED ANGLE
The included angle is the angle measured from the camber angle to the line through the center of the strut and lower ball joint as viewed from the front of the vehicle.

SCRUB RADIUS
The scrub radius is the distance between the line through the center of the strut and the lower ball joint to the road surface, and the actual O° or true vertical.

SET BACK
The set back is the distance in which one front wheel may be rearward of the other front wheel.

TURNING ANGLE





The angle of each front wheel, when a vehicle makes a turn, is different. Each wheel is following an independent path, and requires its own angle. Check the turning angle with a commercially available turning radius gage. If the vehicle's turning angle is not correct, adjust the angle by changing the length of the pitman arm stopper bolts located on the vehicle frame.


Following turning angle adjustment, check front toe adjustment.
Adjust the following:
1. Inside steering angle to 32.5°.
2. Outside steering angle to 30.5°.

THRUST ANGLE





The front wheels aim or steer the vehicle, but the rear wheels control tracking. This tracking action is relative to thrust angle and rear wheel toe. Thrust angle is deemed as the path that the rear wheels take. Ideally, the thrust angle is geometrically aligned with the body centerline.