Pirelli admit they “underestimated” effect of tire swapping

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Pirelli’s motorsport director Paul Hembery has admitted that the Italian tire supplier underestimated the effect of allowing teams to undertake ‘tire swapping’ at the last race, believing that this was the biggest factor in causing the multiple failures at the British Grand Prix.

Lewis Hamilton, Felipe Massa, Jean-Eric Vergne, Sergio Perez and Esteban Gutierrez all suffered from blowouts during the race at Silverstone, triggering Pirelli to make changes for this weekend’s race. Hembery has admitted that it was a mistake by Pirelli which caused the madness to ensue.

“Just to recap, at Silverstone we’d underestimated the impact of swapping the tires,” Hembery said in the Friday press conference. “The cars were two, maybe three seconds quicker this year. Whilst we’d allowed the teams to do that, we’d underestimated the impact on the tire.”

Teams have been permitted to switch which side of the car they run the Pirelli tires on – i.e. using the front-left tire on the front-right of the car – and it has aided tire management, reducing wear in places. However, Hembery explained how this has caused a weakness in the tire which was evident at Silverstone.

“When you swap them around that creates a point with the metallic belt that we have on it, on the left hand side, the camber side, and that created the weakness.We got that wrong and we needed to get it right going forward.”

As a result, Pirelli have changed the structure of the tire, using a kevlar belt in the tire before reverting to the 2012 constructions for the Hungarian Grand Prix at the end of this month. The process of tire swapping has been banned for this weekend by the FIA following guidance from Pirelli.

Toyota No. 8 car wins the 24 Hours of Le Mans for third consecutive year

24 Hours of Le Mans
JEAN-FRANCOIS MONIER/AFP via Getty Images
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LE MANS, France — Toyota Gazoo’s No. 8 car comfortably won the 24 Hours of Le Mans by five laps Sunday to secure a third straight victory in the prestigious endurance race.

It was also a third consecutive win for Swiss driver Sebastien Buemi and Japan’s Kazuki Nakajima driving. Brendon Hartley was the other driver, having replaced two-time Formula One champion Fernando Alonso.

Buemi and Hartley sat on the side of the car as Nakajima drove toward the podium. Hartley won for a second time after tasting success with the Porsche LMP Team in 2017 before an unhappy season in Formula One.

The Swiss team’s Rebellion No. 1 featured American driver Gustavo Menezes and Brazilian Bruno Senna – the nephew of late F1 great Ayrton Senna.

It finished one lap ahead of Toyota Gazoo’s No. 7, with Rebellion’s No. 3 finishing in fourth place.

For much of the race it looked like Toyota’s No. 7 would win after leading comfortably from pole position. But late into the night the car encountered an engine problem and the 30-minute stop in the stands proved costly.

The race was first held in 1923. A total of 252,500 spectators attended in 2019, but there were none this year when the race started three months late because of the novel coronavirus (COVID-19) pandemic.

“We miss the fans,” New Zealander Hartley said. “I look forward to seeing all the fans again.”

In other divisions:

United Autosports won the LMP2 division with the entry of Filipe Albuquerque, Paul Di Resta and Phil Hanson.

–In LMGTE Pro, the victory was claimed by Aston Martin Vantage AMR of Maxime Martin, Alex Lynn and Harry Tincknell (who drives for Mazda in the DPi division of IMSA).

–TF Sport won the LMGTE Am class.

The Toyota No. 7 took pole after former F1 driver Kamui Kobayashi narrowly edged out the Rebellion No. 1 team in qualifying.

In damp and humid conditions Mike Conway got away cleanly from the start, while Senna held off Buemi.

After nearly seven hours, Toyota’s No. 8 fell back after a 10-minute stop in the stands to fix a brake-cooling problem on Kazuki Nakajima’s car. Rebellion’s No. 1, driven by Frenchman Norman Nato, took advantage to move into second place behind Toyota’s No. 7.

Then came the decisive moment at 2:40 a.m. as the No. 7 – also featuring Argentine Jose Maria Lopez – encountered a turbo problem. When the car came back out it was back in fourth.

“We had a few problems early in the race,” Nakajima said. “Later they had a bigger issue than us.”

Rebellion’s No. 1 encountered a problem on the hood at around 9 a.m. and the change took six minutes, allowing the Rebellion No. 3 (Nathanael Berthon-Louis Deletraz-Romain Dumas) to close the gap.

It was becoming a tight battle between the two Rebellion cars behind Toyota’s No. 8.

At 12 p.m. Rebellion No. 3 with Dumas behind the wheel was only one second ahead of No. 1 driven by Menezes. Then both cars came in for a driver change with Deletraz swapping for Dumas on a lengthy stop, and Nato for Menezes as Rebellion No. 1 suddenly moved ahead of its team rival.

Dumas, a winner in 2016 with Porsche, appeared unhappy at the strategy decision to bring his car in first and the length of the stop. There were tense explanations in the team garage.

Colombian Tatiana Calderon, an F1 test driver with Alfa Romeo, was in the Richard Mille Racing Team in the LMP2 category. She was joined by German Sophia Florsch – an F3 driver – and Dutchwoman Beitske Visser. They placed ninth out of 24 in their category.