Pirelli has released the findings from its investigation into the tyre failures suffered by two drivers during the Azerbaijan Grand Prix.
Max Verstappen and Lance Stroll crashed out of the last round of the world championship after suffering deflations on their left-rear tyres. Both occured at high speed while the drivers were around 30 laps into stints on Pirelli’s C3 compound, which was designated as the hard tyre for the race.
Following the race Pirelli confirmed it had also discovered a cut on a left-rear tyre belonging to Lewis Hamilton which was removed from his car during the red flag stoppage caused by Verstappen’s crash. Hamilton’s cut tyre, also a C3, was analysed by Pirelli at its Milan headquarters along with the two failed tyres and other samples from the event.
In a statement issued today Formula 1’s official tyre supplier said: “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.”
Red Bull issued a statement affirming it “worked closely with Pirelli and the FIA during their investigation into Max’s tyre failure on lap 47 of the Azerbaijan Grand Prix and can confirm that no car fault was found.
“We adhered to Pirelli’s tyre parameters at all times and will continue to follow their guidance,” said the team.
“We are grateful that following the weekend’s high speed impacts no drivers were injured,” Red Bull added.
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