To prevent vibration, skidding, noise, and abnormal wear, wheel alignment inspection is necessary.
The Importance of Wheel Alignment
The purpose of wheel alignment is to adjust front-wheel handling while driving. If wheel alignment is off, the tyre life is shortened whilst car and mileage performance also decreases.
Aspects of Wheel Alignment
Caster angle settings when compared (from the side) allow the vehicle manufacturer to balance steering effort, high speed stability and front end cornering effectiveness. Increasing the amount of positive caster will increase steering effort and straight line tracking as well as improving high speed stability and cornering effectiveness, whereas decreasing positive caster results in less steering stability.
The camber prevents tyre abrasion and increases steering manipulation. According to the angle at which the top or bottom portion of a tyre pulls inward or outward when the car is on a flat surface, there are three types of camber: positive, negative and neutral.
With the development of suspension and auto technology, most vehicles today have negative camber. In the case of negative camber, the car tilts when cornering due to centrifugal force. The outer tyres area of contact with the road surface increases, which allows for safe cornering.
The toe refers to the directional difference between the front and back of a tyre formed by the upper part of an axis on a flat plane. There are two types of toe: toe-in and toe-out. Toe-in indicates the tyres front part pulled inward and toe-out indicates the tyres front part pulled outward. In the case of severe toe-out, abrasion occurs on the tyres inner surface. In the case of severe toe-in, abrasion occurs on the tyres outer surface. Both cases experience a high degree of resistance from the road surface, which results in decreased drivability and greater fuel cost. A controlled degree of toe-in increases safety in straight line driving and offsets inner abrasion that occurs due to negative camber.
When to Check Wheel Alignment
An inspection is required when,
- The car has been in an accident.
- After tyre replacement.
- When there is abnormal tyre wear on the tyres shoulder.
- When the handling is unstable and/or wobbles.
- When ride quality has become rougher or fuel economy has declined.