How are the Wheels aligned?
Some vehicles require only that the front wheels be aligned, but many car-based models require four-wheel alignment. Alignment specifications differ by vehicle, and it isn’t as simple as just making sure all four wheels are pointed straight ahead.
Alignment Specifics
Depending on the vehicle, proper alignment involves setting the camber (inward or outward tilt of the wheels when looking head on), caster (wheel tilt front or back looking from the side) and toe-in or toe-out (looking down at the wheels from above). The adjustments are measured in fractions of an inch and require specialized alignment equipment.