Does anyone know how to accurately measure track width?

99t1

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Does anyone know how to accurately measure track width? I sat in the impound area after an SCCA T1 race for a loooong time while 5 guys took turns with what loooked like a large slide rule trying to measure track width. Maybe this is correct but they measured from 4 positions around the tire and then averaged the numbers to compensate for camber and toe.

Where in the Factory manual does it list track width..if it even does??? I heard a rumor that even the factory wheels are "sometimes" illegal. I was running HREs.
 
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