More than a week after the Grand Prix of Azerbaijan, Pirelli published the results of the investigation into the tyre failures on the cars of Lance Stroll and Max Verstappen, and the Italian manufacturer suspects that those were caused by the improper use of tyres that does not comply with their instructions.

Pirelli, in conjunction with the FIA, has completed the analysis of the left-rear tyres involved in the incidents that affected Lance Stroll and Max Verstappen during the recent Azerbaijan Grand Prix.

This analysis also took in the tyres used by other cars in the race, which had the same or a higher number of laps on them compared to the ones that were damaged.

The process established that there was no production or quality defect on any of the tyres; nor was there any sign of fatigue or delamination. The causes of the two left-rear tyre failures on the Aston Martin and Red Bull cars have been clearly identified.

In each case, this was down to a circumferential break on the inner sidewall, which 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 have submitted their report to the FIA and the Teams. The FIA and Pirelli have agreed a new set of the protocols, including an upgraded technical directive already distributed, for monitoring operating conditions during a race weekend and they will consider any other appropriate actions.

Since there is a big difference in performance, the teams use all possible tricks to make the cars on the track have lower pressures than prescribed, and this can lead to easier tire bursting, especially when they cool on the tracks leading to a drop in pressure.

Red Bull commented on Pirelli’s announcement and said that in Azerbaijan they respected their parameters ‘all the time’ and that they will continue to do the same in the next races.

Pirelli has prepared three middle range tyre compounds for France (C2, C3 and C4), just like for the two races that follow behind it in Austria while for the race after them at Silverstone it will bring the three hardest compounds.

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