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Using String

•  String is perhaps the least accurate and most time consuming of all wheel aligning methods

•  Each time the rear wheel is adjusted, you must change the positions of both strings and repeat all the measurements. This is tedious and time consuming

•  The accuracy of the measurements depends upon the tire-to-tire straightness of the pulled string. The straightness can vary significantly on both sides of the front tire

String Kink

•  This problem occurs from your having to be sure the straightened string is touching the front edge of the rear tire

•  In order to be sure the string is touching the front edge of the tire, you must hold the string lightly against it

•  This light holding pressure causes the string to kink slightly, which is not easily seen

String Error

•  Due to this unseen kink, the measurements you take at the front tire to determine its parallelism and alignment to the rear tire can be highly inaccurate

•  This inaccuracy can occur simultaneously with both strings to cause further wheel misalignment

•  In the photos below, the straightness of the string falsely appears to be the same. The slight kink that produces the measuring errors cannot be perceived.


•  ProAligner™ measures the wide variance in the perceived straightness of the string due to light holding pressure

•  As shown above, the straightness of the string ranges between 80-76 on the ProAligner™ scale –a total variation of 0.4 inches (10.0 mm)!

This is the potential error for string alignment on just one side of the tire. Changing the string position to the opposite side doubles the potential error.

ProAligner™ is Proven Superior

•  Forget about using string, which is both obsolelte and grossly inaccurate.

•  Use ProAligner™ to sight the tires/wheels directly and measure wheel alignment exactly. No need to reposition or adjust anything but the rear wheel itself

•  Use ProAligner™ to align the rear wheel to the front wheel steering axis within .05 inches (1.3 mm) with minimum time and effort. And you know without doubt your wheel alignment is correct.

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