Pirelli has confirmed that it will be taking every step to discover the cause of the tyre failure that sidelined Paul di Resta in second practice at the Spanish Grand Prix.The Scot's left rear tyre lost its tread entering the start-finish straight during the second half of afternoon practice and, despite the tyre still being fully inflated, he was advised to pull over and not attempt to return to the pits for a replacement.The 'failure' – not a word Pirelli likes to use to describe its issues – follows on from similar problems that afflicted both Lewis Hamilton and Felipe Massa at the Bahrain Grand Prix, where the medium compound tyre proved fragile. With di Resta's symptoms differing...
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