Pirelli: Red Bull and Aston Martin were running with lower pressures

Red Bull and Aston Martin were running with lower pressures than expected in Formula 1’s Azerbaijan Grand Prix, Pirelli said on Thursday, but did not break any rules.

Pirelli: Red Bull and Aston Martin were running with lower pressures

While F1’s tyre supplier had previously been cryptic in suggesting in a statement that ‘running conditions’ had been behind the tyre failures suffered by Max Verstappen and Lance Stroll in Baku, it has now elaborated further on what triggered the blowouts.

And while Pirelli confirmed that both Red Bull and Aston Martin had followed the regulations with the minimum starting pressures and maximum blanket temperatures, it says that things deviated from what it expected once the cars were running.

Pirelli normally sets a starting pressure based on an expectation that the pressure will then raise further once the tyres are running out on track.

However, it appears that the tyres on Aston Martin and Red Bull did not experience such a raise in pressure in Baku and were therefore running at a lower level than Pirelli anticipated.

By running below the pressure that Pirelli expected, it meant the standing waves being caused by the high speed Baku corners were enough to trigger the failure on the inside shoulders of Verstappen and Stroll’s left rear tyres.

Read Also:

Speaking to media at the French Grand Prix, Pirelli's head of F1 and car racing Mario Isola confirmed that both teams were running with tyres outside of what Pirelli had expected.

“What happened in Baku is simply that the running conditions expected were different compared to the actual running conditions - and that created the failure,” he said.

“When you have a lot of energy going into the tyres, with the pressure that is lower compared to the expectation, the result is that on the sidewall you have what we call standing waves.

“Standing waves are putting a lot of energy into the inside shoulder of the tyre. And at a certain point, the tyre breaks. That is what happened, and the reason why we had this situation in in Baku.”

Isola said that the issue was not totally down to the tyre pressures at those two teams being below what was expected.

Another contributing factor was that Pirelli’s predictions for car performance over the weekend, based on data that teams had supplied, were not in line with how they really fared out on track.

“When we prepare the prescriptions [for minimum pressure], we receive the simulations and we consider margins,” he said. “The expected loads, the downforce or the speed, are simulated, so it is not exactly the value that we find on track. And in this case in Baku, we also found some parameters that were not exactly what we found on track.”

He added: “We assume that they are running at a certain pressure, and a certain camber. And with a margin on it, of course, we run in a condition that is okay for the tyre.

“In that case, we didn't achieve these conditions, not because teams were doing something against the regulations, but because they were looking as usual for performance, and that created a different scenario to what we were expecting. And the different scenario was that mainly the tyres were running at a lower pressure compared to expectation.”

Lance Stroll, Aston Martin AMR21

Lance Stroll, Aston Martin AMR21

Photo by: Zak Mauger / Motorsport Images

Isola said that the teams had not done anything against the regulations because there is no minimum running pressure that needs to be adhered to.

However, that is changing for next year when teams must run with a standard pressure sensor as part of F1’s new rules era.

“If the regulation is not written that there is a running pressure that you have to respect, I cannot say that they were doing something against the regulation in their search of more performance," continued Isola.

“If they respect the starting pressure, they are complying with the regulation. If the same happens next year when we, with the standard sensor, impose a running pressure, in that case they are against the regulations. But this is not the case this year.”

Isola said it was not really a surprise that teams were pushing the margins on tyre pressures, as he suggested the spread between teams on running pressures in Baku was more than one Psi.

“Each team is looking for performance,” he said. “They are here racing, they are not here just to cruise on track. And that means that, looking for performance, we know that if you go with a bit lower pressure, you get some performance."

Although there have been suspicions about teams playing around with pressures in recent races, Isola said Baku was the first time that it had been picked up in such a way.

“We check every time the running parameters when we receive the telemetry data from the race," he said. "We check everything on all the teams, of course, and also because it's an indication for the following race and its prescription, so we use the data. “

shares
comments

Related video

Perez: O’Ward can race the very best drivers in the world

Previous article

Perez: O’Ward can race the very best drivers in the world

Next article

Juan Manuel Correa returns to Sauber young driver academy

Juan Manuel Correa returns to Sauber young driver academy
Load comments
The core problems Yas Marina’s long-awaited tweaks won't address Prime

The core problems Yas Marina’s long-awaited tweaks won't address

OPINION: Changes to the layout of Abu Dhabi’s circuit aim to reverse the trend of insipid Formula 1 races there - the promoter has even described one of the new corners as “iconic”. And that, argues STUART CODLING, is one of this venue’s abiding failings

Formula 1
Jul 26, 2021
How Ferrari offered Callum Ilott what Red Bull couldn't Prime

How Ferrari offered Callum Ilott what Red Bull couldn't

Last year's Formula 2 runner-up Callum Ilott could be on his way to becoming the first Briton to contest a grand prix in an Alfa Romeo since Reg Parnell in 1950. But, says Oleg Karpov, the Ferrari Driver Academy protege is having to temper his ambition at the moment – outwardly at least…

Formula 1
Jul 25, 2021
The signs that point to F1's rude health Prime

The signs that point to F1's rude health

OPINION: Formula 1's calendar might still be facing disruption as the pandemic affects travel but, says Mark Gallagher, the business itself is fundamentally strong thanks to the epic rivalry taking place on track and the consistent arrival of new sponsors.

Formula 1
Jul 24, 2021
The unexpected benefit of F1's sprint race repeat Prime

The unexpected benefit of F1's sprint race repeat

OPINION: Formula 1's sprint race trial at Silverstone drew mixed feedback on Saturday, but there remained the true test of how it would impact Sunday's Grand Prix. While fans were busy marvelling at Fernando Alonso's progress, a key lesson was being learned that would directly contribute to the dramatic lap-one clash at Copse the following day

Formula 1
Jul 22, 2021
The off-track considerations that led to Hamilton/Verstappen F1 shunt Prime

The off-track considerations that led to Hamilton/Verstappen F1 shunt

OPINION: Formula 1’s 2021 title fight turned ugly last weekend when Max Verstappen and Lewis Hamilton collided at the start of the British Grand Prix. Verstappen thankfully walked away unharmed, but this had been a clash long-since coming.

Formula 1
Jul 21, 2021
British Grand Prix Driver Ratings Prime

British Grand Prix Driver Ratings

The 2021 British Grand Prix will live long in the memory for the dramatic clash between Formula 1's two title protagonists, which opened the door for other drivers to capitalise. One did so in spectacular fashion, while others fluffed their lines

Formula 1
Jul 19, 2021
How Leclerc almost defied Hamilton after Silverstone clash Prime

How Leclerc almost defied Hamilton after Silverstone clash

A poor start for Valtteri Bottas and the lap one clash between Formula 1's 2021 title protagonists gave Charles Leclerc a surprise lead in the British Grand Prix that he almost held to the end. Here's how the Ferrari driver came close to a famous victory, ultimately denied by a recovering Lewis Hamilton three laps from home

Formula 1
Jul 19, 2021
The signs that suggest Mercedes can win at Silverstone Prime

The signs that suggest Mercedes can win at Silverstone

Red Bull and Max Verstappen scored an early blow against Lewis Hamilton and Mercedes at Silverstone, with sprint qualifying race victory. But that doesn’t mean Sunday’s grand prix is a foregone conclusion. Although Verstappen starts as the favourite, here’s why Mercedes still holds hope of winning

Formula 1
Jul 18, 2021