Red Bull's Helmut Marko continues to believe that Pirelli's modified tyres introduced in Spain were done so to help Mercedes, but Toto Wolff says his countryman is barking up the wrong tree. To prevent risks of tyre blistering, Pirelli reduced the depth of the tread of its tyres by 0.4mm specifically for Barcelona's resurfaced Circuit de Catalunya. The changes appeared to have favourable impact on Mercedes' W09, while Ferrari struggled on the modified rubber. "You don't have to be a genius to understand that the tyres get harder when you scratch off 4 millimetres," the Scuderia's Sebastian Vettel told Bild. "That's how other teams got on better than we did." Pirelli's...
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