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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.






80
78
76



•  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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