Alignment: Description and Operation

CASTER
The caster is the forward or rearward tilt of the top of the front wheel spindle.
Positive: The top of the front wheel spindle tilts to the rear.
Negative: The top of the spindle tilts to the front.

CAMBER
Camber is the amount that the centerline of the wheel is tilted inward or outward from the true vertical.
Positive: The top of the wheel is tilted outward, away from the vehicle.
Negative: The top of the wheel is tilted inward, toward the vehicle, the camber is negative.

TOE

NOTE: Toe should only be checked and adjusted after the camber has been adjusted to specification.

Toe-in and toe-out are the difference in the distance between the extreme front and extreme rear of the tires.
Toe-in (Positive) occurs when the dimension taken at the front of the tires is less than that taken at the rear of the tires.
Toe-out (Negative) occurs when the dimension taken at the front of the tires is greater than that taken at the rear of the tires.