Though red-hot favourites for another win, Mercedes admits to concern over tyre degradation.In many ways those four bits of rubber have always proved to be the Brackley outfit's Achilles Heel, and even though the F1 W05 appears to be the class of the 2014 field - certainly at this early stage - the problem remains.While Nico Rosberg and teammate Lewis Hamilton were quick to dismiss fuel consumption as a concern, both admitted that they are worried by tyre degradation, the British driver having claimed it felt like he was driving on marbles in the opening session, in which he posted the fastest time.'It was a decent day, tough conditions, very, very hot and tough for the car, tough for the...
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