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Pirelli identifies reason tyres failed in Azerbaijan Grand Prix

Pirelli has said that a “circumferential break” on the inner sidewall of its tyres is the reason behind why they failed during the recent Azerbaijan Grand Prix.

The Italian tyre maker, in conjunction with the FIA, completed the analysis of the left-rear tyres involved in the incidents that affected drivers Lance Stroll and Max Verstappen in Baku.

Pirelli said the analysis showed that there was no production or quality defect on any of the tyres.

The two left-rear tyre failures on the Aston Martin and Red Bull cars was down to a circumferential break on the inner sidewall, it said.

This can be related to the running conditions of the tyre, in spite of the prescribed starting parameters (minimum pressure and maximum blanket temperature) having been followed.

As a result of this analysis, Pirelli said it has submitted its report to the FIA and the teams.

Pirelli said it now plans on working with the FIA to set new protocols, including an upgraded technical directive already distributed, for monitoring operating conditions during a race weekend.