A wheel alignment consists of the process of making sure that the wheels are at the right angle to the suspension and the ground, which is very important in the control of the vehicle and in reducing the tires wear. The main angles that were measured in this process are camber, caster, and toe-in. Camber and caster are not always adjustable, but they are usually inspected in a worn or damaged state in suspension parts. Toe-in, or inward rotation of the wheels is adjustable on the front of any vehicle and the rear of any that has independent rear suspension and makes sure that the wheels are rolling parallel. It needs a specific equipment and skill to be properly aligned with the wheels and in this regard, it is recommended to have a skilled technician to carry out the alignment of the wheels. Toe-in is gauged by the gap between the front and the rear of the wheels and erroneous toe-in causes unequal wear of tires. Camber is defined as an outward or inward rotation of the wheels of a vehicle between vertical. Negative camber means the structure of the wheel is tilted inwards whereas positive camber means the structure is tilted outwards. The camber angle is expressed in degrees and determines the contact between the tire tread and the road and adjusts to variations in the suspension geometry when turning a corner or on an irregular surface. According to Caster, the tilt of the front steering axis is explained where a rearward tilt can be defined as positive caster and a forward tilt as negative caster.