Pirelli F1 boss Mario Isola insists Red Bull and Aston Martin ran with lower pressures in Baku that contributed to their tyre failures, but neither team broke the rules. Pirelli concluded in its official report that followed its investigation into the blowouts that occurred in the Azerbaijan Grand Prix that "running conditions" had contributed to the "circumferential break on the inner sidewall" of the rear-left tyre that led to the failures. But the Italian manufacturer's report stopped short of clearly blaming Red Bull and Aston Martin for the incidents, but hinted that both teams had perhaps found a way to lower their tyre pressures below the prescribed minimum level...
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