Bridgestone has revealed that it is having to make further investigations into the possible reasons for Lewis Hamilton's tyre problems in the Turkish Grand Prix.

The Briton experienced a sudden failure of the right-front tyre on lap 44 at Istanbul Park, nearly sending him into the gravel and restricting him to a fifth-place finish after pitting for a replacement. McLaren and Bridgestone are working together to check reasons for the failure, which helped cut Hamilton's championship lead back to just five points after his three title rivals - Felipe Massa, Kimi Raikkonen and team-mate Fernando Alonso - filled the podium positions.

"Unfortunately, Lewis' front-right tyre deflated on his second stint and we are still investigating the reason for this," head of track engineering operations Kees van de Grint confirmed, "The cause is not immediately evident following our preliminary investigations. Fortunately, Hamilton was able to pit and finish the race to take points."

Massa repeated his 2006 win in Turkey after a dominant display on Bridgestone's hard and medium compound Potenzas in hot and gruelling conditions, but a diverse range of strategies were used up and down the field, with both Ferraris starting on the medium compound, unlike the majority of the field. They opted for two stints on the softer tyre, unlike Alonso's two on the harder compound. Two stop strategies were the most numerous, although two cars employed a one-stop strategy.

"Today's race was all about the start," van der Grint continued, "The Ferrari drivers both took advantage of the medium compound for their opening stints and, from that point on, it looked like a straightforward race. The lap time difference between the two specifications of Bridgestone tyre closed as the race progressed and both specifications had similar wear levels. We did observe some chunking of the tyres today due to the long left hand corner in the turn eight complex and we will take this into consideration for next year's race."



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