Charles Pic has warned that the F1 teams face a 'big challenge' if Pirelli push forward their plans to introduce 18-inch tyres.The Frenchman became the first driver to run the new compounds on the second and final day of testing at Silverstone on Wednesday. The Lotus driver ran the radical prototypes for a total of 14 laps with his fastest lap almost ten seconds off the pace before reverting to a conventional 13-inch set late in the afternoon.But while Pic played down the significance of his lap times, explaining that his task had been data-gathering rather than putting the experimental rubber through its paces, he was adamant that the introduction of 18-inch tyres – which...
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