Pirelli: Softer tyres move not a risk for second Silverstone F1 race

Pirelli boss Mario Isola has downplayed concerns about the move to softer compounds for the 70th Anniversary Grand Prix at Silverstone following the failures in last weekend's British GP

Pirelli: Softer tyres move not a risk for second Silverstone F1 race

Pirelli's analysis of the front-left failures on the Formula 1 cars of Lewis Hamilton, Valtteri Bottas and Carlos Sainz Jr has confirmed that the unusually long stints run after drivers made early stops under the safety car led to the failures, which created a situation that Isola called a "a perfect storm."

The Italian company has stuck with the original decision to move to the C2, C3 and C4 range - leaving out the C1s that failed last weekend - but will mandate increased pressures. The minimum front pressure will be up by 2psi, and the rear by 1psi.

Isola insists that softer compounds won't create any extra risk as the tyre compound did not have an impact on the failures suffered on Sunday.

PLUS: Why Silverstone is "not friends" with tyres

"The investigation says that the cause of the initial loss of pressure and then the deflation was the level of stress on the tyre, on the construction of the tyre," Isola said. "And for that reason the action we are taking for the next race is to increase the pressure, because obviously it is the pressure that is helping the construction.

"And we keep the same compounds, C2, C3 and C4, that have been already decided a few weeks ago. The tread compound is not affecting in any way what happened on the tyres.

"I don't want to use the word perfect storm, because I don't like it, but the fact that the safety car was out on lap 12, obviously was pushing everybody to change on lap 12. In a normal situation, a normal strategy was to change for cars that were targeting a one-stop strategy at lap 18-20.

"Consider also that when you follow a safety car the pressure is going down, and then obviously at the restart of the safety car, there is a period in which the pressure grows.

"At the restart of the safety car you have a very quick corner, with a lot of energy that is going into the tyre. We usually consider that in our estimation, when we give the prescriptions, we consider all that. And it was confirmed from telemetry data that the level of energy was very, very high.

"So the safety car plus the long stint plus the fact that the construction with less tread is less protected caused an initial loss of pressure, and the loss of pressure leads to a deflation. If you look at the tyres they had both sidewalls still in place in the right position, and the tread ring was broken, that is the typical situation when you run the tyre flat."

PLUS: The crucial factors that took Hamilton to the brink of disaster

Isola says that the move to softer compounds will automatically force teams to run shorter stints next weekend, with multiple stops expected.

"I believe that because we are going with one step softer compounds the length of the stint will be shorter by definition because the compounds are softer.

"Consider that the medium compound that will be the hard for this weekend, the only one that was running 36 laps was Grosjean, and tyres were completely finished. So I struggle to believe that they can run more than 30-something laps next weekend."

Isola confirmed that many cars finished with cuts on their tyres, an issue not related to the Mercedes and McLaren failures.

Red Bull boss Christian Horner said on Sunday that the set taken off Max Verstappen's car at his late stop had multiple cuts, suggesting that the Dutchman's might have had a failure had he not pitted in his efforts to get fastest lap.

"It is true that we recorded a high number of cuts, in some cases they were superficial, in some cases they were quite deep," said Isola.

"The high number of cuts was recorded especially on the tyres from the second stint. I believe that the pieces of the front wing lost by Kimi Raikkonen was the main cause of the cuts on the tyres.

"We had one tyre, if I remember well it was the front left from [Nicholas] Latifi, with a puncture. The tyre was still losing air when he was coming back to parc ferme. I confirm that there was debris on track, I confirm we found some cuts.

"Also from the tyres used in the first stint, probably from the accident of Kvyat. But I think we came to the conclusion that the cuts were not responsible for what happened to the tyres of Mercedes and Carlos Sainz.

"It is clear with a high level of wear most of the tyres were close to 100% wear, without rubber on the tread, that is exposing the construction, the construction is less protected, and any impact on the construction has a different effect. And also any piece of debris is more dangerous, because it can cut the construction, and therefore cause a failure.

"But to tell you if the cuts on Max's tyre were big enough to stop him without an additional pit stop is difficult to say."

shares
comments
Todt: Formula 1 has set "global example" with return to racing

Previous article

Todt: Formula 1 has set "global example" with return to racing

Next article

F1 working on "standard" provisional calendar for 2021

F1 working on "standard" provisional calendar for 2021
Load comments
The hidden Ferrari struggle that Sainz’s recent charge put to rest Plus

The hidden Ferrari struggle that Sainz’s recent charge put to rest

Despite appearing to adjust to life as a Ferrari driver with relative ease, it was far from straightforward under the surface for Carlos Sainz Jr. But, having made breakthroughs in rather different routes at the Russian and Turkish races, he’s now targeting even greater feats for the rest of the Formula 1 season

The final throes of Brazil's fleetingly successful F1 team Plus

The final throes of Brazil's fleetingly successful F1 team

Emerson Fittipaldi is better remembered for his Formula 1 world championships and Indianapolis 500 successes than for the spell running his eponymous F1 team. Despite a hugely talented roll call of staff, it was a period of internal strife, limited funding and few results - as remembered by Autosport's technical consultant

Formula 1
Oct 18, 2021
Why McLaren's expanding agenda will benefit its F1 resurgence Plus

Why McLaren's expanding agenda will benefit its F1 resurgence

In the 1960s and 1970s, McLaren juggled works entries in F1, sportscars and the Indy 500 while building cars for F3 and F2. Now it’s returning to its roots, expanding 
into IndyCars and Extreme E while continuing its F1 renaissance. There’s talk of Formula E and WEC entries too. But is this all too much, too soon? STUART CODLING talks to the man in charge

Formula 1
Oct 17, 2021
How Tsunoda plans to achieve his F1 potential Plus

How Tsunoda plans to achieve his F1 potential

Yuki Tsunoda arrived in grand prix racing amid a whirlwind of hype, which only increased after his first race impressed the biggest wigs in Formula 1. His road since has been rocky and crash-filled, and OLEG KARPOV asks why Red Bull maintains faith in a driver who admits he isn’t really that big a fan of F1?

Formula 1
Oct 15, 2021
The danger of reading too much into F1's clickbait radio messages Plus

The danger of reading too much into F1's clickbait radio messages

OPINION: After Lewis Hamilton responded to reports labelling him 'furious' with Mercedes following his heated exchanges over team radio during the Russian Grand Prix, it provided a snapshot on how Formula 1 broadcasting radio snippets can both illuminate and misrepresent the true situation

Formula 1
Oct 14, 2021
Why F1’s approach to pole winners with grid penalties undermines drivers Plus

Why F1’s approach to pole winners with grid penalties undermines drivers

OPINION: Valtteri Bottas is credited with pole position for the 2021 Turkish Grand Prix, despite being beaten in qualifying. This is another example of Formula 1 and the FIA scoring an own goal by forgetting what makes motorsport magic, with the Istanbul race winner also a victim of this in the championship’s recent history

Formula 1
Oct 13, 2021
Turkish Grand Prix Driver Ratings Plus

Turkish Grand Prix Driver Ratings

On a day that the number two Mercedes enjoyed a rare day in the sun, the Turkish Grand Prix produced several standout drives - not least from a driver who has hit a purple patch of late

Formula 1
Oct 11, 2021
The hidden factors that thwarted Hamilton's bid for shock Turkish GP glory Plus

The hidden factors that thwarted Hamilton's bid for shock Turkish GP glory

Starting 11th after his engine change grid penalty, Lewis Hamilton faced a tough task to repeat his Turkish Grand Prix heroics of 2020 - despite making strong early progress in the wet. Instead, his Mercedes team-mate Valtteri Bottas broke through for a first win of the year to mitigate Max Verstappen re-taking the points lead

Formula 1
Oct 11, 2021