Following the tire failures in last Sunday's British Grand Prix at Silverstone, Pirelli quickly made changes to the tires that will be used in this weekend's German Grand Prix. Four drivers -- Lewis Hamilton, Felipe Massa, Sergio Perez and Jean-Eric Vergne -- suffered left-rear tire failure during the British GP. Hamilton started on the pole and led the first seven laps before his tire blew. He rallied for a fourth-place f
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