An alignment essentially requires squaring a car’s wheels and axles with each other so that they’re moving in the same direction. The mechanic adjusts the various suspension angles — known as Toe, Thrust, Camber and Caster — that influence tire movement and position. The technician will also ensure that the steering wheel is centred.
Each car’s manufacturer designates standard angles for the alignment, specified in degrees. If you’re a driver of a high-performance car or sports car, your mechanic may be able to align your suspension to improve handling and tire performance, but such an alignment still may lead to uneven tire wear.
The type of alignment you receive will depend on your car’s suspension. A four-wheel alignment is reserved for all-wheel drive vehicles or front-wheel drive vehicles with independent or adjustable rear suspensions. In this case, both axles have to be properly aligned so that all four wheels align in a rectangle, parallel to one another and perpendicular to the ground.
If you don’t have a four-wheel or all-wheel drive vehicle, your car will likely only require a front-end alignment, in which only the front-axle components are adjusted, or a thrust-angle alignment. Thrust angle refers to the angle that a car’s rear wheels point relative to the car’s center. In such an alignment, the rear wheels and axle are realigned so as to be parallel with the front axle and perpendicular to the center line of the car.
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