Adrian Newey has admitted Pirelli's mid-season tyre specification change helped the quadruple back-to-back world champions in 2013.
Sebastian Vettel, who clinched his fourth title in India last weekend, had already won races this season at the time of the tyre-exploding British grand prix, where after Pirelli came under pressure to revert to last year's kevlar-belted construction.
Red Bull lobbied hard for the change, and car designer Newey has now admitted that the 2012 tyres gave the team a performance boost.
"Going back to the 2012 tyres clearly helped us," he is quoted by France's L'Equipe.
"Our car works very well in fast corners, which is where the 2013 tyres suffered...
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