Pirelli's Paul Hembery has said F1's big technical change made it necessary for a re-think on tyres but denied that this year's rubber is too conservative.The latter has been suggested by a number of drivers so far this season as they've adapted to new hybrid cars which have less grip than their predecessors but also more torque.Stung by negative publicity they've received in the past, Pirelli have provided harder rubber this season. Even so, Hembery insisted the Italian manufacturer hasn't played it too safe.'Conservative is, I don't think, is really the right word,' Hembery, Pirelli's Motorsport Director, told Sky Sports News. 'I think we had to take a little step back; we certainly...
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