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Wheel alignment is part of standard automobile maintenance that consists of adjusting the angles of the wheels so that they are set to the car maker's specification. The purpose of these adjustments is to reduce tyre wear, and to ensure that vehicle travel is straight and true (without "pulling" to one side).
When to Perform the Alignment
your car seems to be drifting to one side, even when you think you're driving straight.
your steering wheel vibrates.
you are driving straight, but your steering wheel isn't centered.
If none of these indicators occurs but it's been a while since your last alignment, check your owner's manual to see how often the manufacturer recommends having this service.