St. Pete IndyCar: Herta, Kirkwood top raceday warm-up

There was plenty of experimentation with tires in the 78 degree heat and increasing humidity under cloudy skies. Firestone’s guayule-sidewalled tires had a noticeable peak for one lap – two by the gentlest driver/car combinations – but drivers and race engineers still needed to know how long they could make them last in what will be a 100-lap race dominated by the primary …Keep reading Source

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