Hot wheel car in the winners circle

Put the dart in the winners circle. Took the points lead in the pro championship race. It's running good 6.39 @108 and it's been deadly consistent. Small block on methanol, power glide and a 475 gear. Leaving at 3000 and shifting at 6000 is conservative but it is consistent. Dave would be proud of his old car.

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Just curious what size tire on the back?