Loosen the screw clips holding the rack gaiters on the track rod sufficiently to turn the rod without twisting the gaiter.
You can turn the rod more easily by clamping self-locking grips to it, then turning the grips.
Grip the ball joint with large grips while you slacken the locknut.
Therefore measure from one outer wheel rim to the other. A wire check cannot be truly accurate, so it does not matter too much that you are not measuring from the 'right' points.
All you can establish is whether the wheels have a slight toe-in or toe-out — not exactly how much the measurement is.
Stretch the wire round the tyres as close to the height of the hub centre as possible, and pull it taut at both front and rear.
Mark this level on the tyres with chalk and a ruler.
Mark the wire near one end, then get a helper to hold the mark on one measuring point and take the wire over to the other.
Pull it taut and mark the wire where it touches the second measuring point.
Repeat the process at the rear of the wheel, trying to keep the same tension on the wire. The distance between the first and second marks on the wire is double the toe-in or toe-out.
Double check by rolling the car forward so that the wheels make half a turn, bounce the car and repeat the whole test.
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