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Michelin identify Rossi's Shanghai problem

Michelin identify Rossi's Shanghai problem

Michelin identify Rossi's Shanghai problem

After a rigorous post-race analysis at the company's Clermont-Ferrand HQ, Michelin have pinpointed the loss of a small piece of front tyre tread as the reason for Valentino Rossi's retirement on lap 16 in the Chinese Grand Prix last month.

The tyre remained inflated despite the missing piece, and the same specification was used by seven other Michelin riders in the race. The team today issued a public apology to the Italian, experiencing the first of two consecutive DNFs in Shanghai.

"The very high level of stress experienced at Shanghai by the centre part of the tyre is the highest during the whole MotoGP season, because of frequent decelerations from over 320km/h to 60km/h within less than eight seconds. It would appear that this tyre could not sustain that level of strain; the safety margin we always include when we develop a tyre was apparently not enough in this particular case. The parameters that influence the levels of stress that a tyre undergoes are, among others: track layout, grip level, riding style and bike set-up. We apologise wholeheartedly to Valentino and the Yamaha team for having failed in this case to provide a front tyre capable of being competitive throughout the race. We have, of course, already taken all necessary measures, where physically possible, to ensure that such an event doesn't happen again," read the statement.


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