McLaren: Tyres still a challenge

McLaren's operations director Simon Roberts thinks it is too soon to suggest that the top Formula 1 teams have now got a handle on the 2012 Pirelli tyres and will command the rest of the season - but reckons it is only a matter of time before that is the case. After the Canadian Grand Prix, Pirelli's motorsport director Paul Hembery argued that the tyre-influenced random results of the early rounds - which saw five different teams winning races - would fade as the regular frontrunners fully grasped the Pirellis' intricacies and pulled clear , although Red Bull chief Christian Horner suggested that the rubber could "be a factor for probably another 13 races" before it was fully understood .

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