Pirelli's Paul Hembery has admitted that determination of all F1 teams to keep information to themselves is hindering development of next year's tyres.Speaking in the wake of the FIA's decision to bar McLaren from joining forces with the Italian manufacturer at a private test in Austin later this month, Hembery also revealed that he felt that teams were also withholding data that would hasten the finalisation of the 2014-spec rubber.Although the dimensions of next year's tyres will remain the same as 2013, the structure is still being finalised as Pirelli fears that the new engine and drivetrain package being introduced to F1 in 2014 will require a different construction to cope. However,...
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