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someone with more experience than me will speak up, but i would say that you definitely need more tread than 4/32nds. the measurement is generally towards the center of the tire, and during aggressive track driving, your tires are going to be punished more around the edges of the tires in the front and rears.
i'd venture to speculate that you'll be seeing belts around the inside edges of your tires if you spend a day at the track with that little tread left.
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