Sebastian Vettel says a straightforward comparaison test between Pirelli's standard tyres and its Spanish Grand Prix modified rubber revealed that Ferrari's issues were chassis related. The Scuderia's relative under-performance in last weekend's race led Vettel to suggest that his lack of pace was linked to Pirelli changing the tread depth of its tyres to accommodate the Circuit de Catalunya's new asphalt. Tuesday's running in Barcelona however told the German driver a different story. Pirelli's Isola: 'Spanish GP a lottery without modified tyres' "I think it's pretty straightforward," he said. "Obviously you don't get the chance to revisit this kind of decisions that are...
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