Pirelli's Paul Hembery says they will never know what caused Vettel's puncture
|By Edd Straw||Wednesday, November 16th 2011, 15:33 GMT|
Pirelli motorsport director Paul Hembery believes his company and Red Bull will probably never know what caused Sebastian Vettel's right-rear tyre to suffer an instant deflation while leading the Abu Dhabi Grand Prix after ruling out tyre failure.
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