To maintain the stability of a vehicle during straight-line driving, ease of steering, and reduce wear between tires and mechanical components, the steering wheels, steering knuckles, and front axle must maintain specific relative positions with the vehicle frame. This installation with fixed relative positions is known as steering wheel alignment, also referred to as front wheel alignment. Proper front wheel alignment delivers the following effects: enabling stable straight-line travel without vehicle wobble; requiring minimal force on the steering wheel when turning; allowing the steering wheel to automatically return to center after a turn; preventing tire slip against the road surface to lower fuel consumption and extend tire service life. Front wheel alignment consists of four parameters: caster angle, kingpin inclination, camber angle, and toe-in.
