Pirelli has identified two under-the-radar factors that could prove decisive in Sunday’s Spanish Grand Prix amid sweltering conditions at the Circuit de Barcelona-Catalunya.
Track temperatures exceeded 50 degrees Celsius on both Friday and Saturday, making the Barcelona weekend the hottest of the 2026 Formula 1 season so far.
Pirelli did not bring its hardest compound selection to Spain, instead opting for a step softer with the C2, C3, and C4 compounds, pushing degradation levels to extreme heights.
Pirelli chief engineer Simone Berra described the situation clearly, stating: “We have seen high level of degradation figures, up to two or three tenths, which is quite a big number.”
Berra attributed the high degradation to a combination of track characteristics, asphalt roughness, circuit energy, and the soaring track temperatures baking the rubber throughout the weekend.
The Barcelona circuit carries the second-highest macro roughness ranking of the entire season, sitting only behind Bahrain, making it uniquely punishing on tyres across a full race distance.
Pirelli’s head of motorsport Dario Marrafuschi highlighted how differing set-up philosophies between teams could create vastly different tyre behaviour once the race begins on Sunday.
“It depends on how the teams chose to approach qualifying with the set-up, depending if they decided to kill the understeer during qualifying to have a good starting position,” Marrafuschi explained.
Teams that sacrificed rear balance to improve one-lap pace in qualifying could find themselves paying a heavy price in tyre overheating and degradation across the full race distance.
“Or if they protected the rear axle today in vision of a more consistent race. I think this is going to be a valuable and exciting variable to see in the fights on track,” Marrafuschi added.
The second hidden factor is rim design, which has become an open development area in 2026 after teams were permitted to move away from the previously standardised supplier rim.
Berra explained that the variation between teams is now considerable, with some designs focused on cooling the tyre aggressively while others stabilise at much higher temperature levels.
“Some other teams are stabilising very low. There are completely different approaches. And I think especially here this will have a big impact,” Berra said.
Teams cannot simply swap rim designs from weekend to weekend, with Pirelli requiring drawings to be submitted, tested, and approved before any new specification can be introduced.
The approval process takes several weeks, and because rim developments fall under the budget cap, financial constraints also play a role in how many new designs a team can realistically introduce across a season.
On race strategy, Pirelli expects a minimum two-stop approach, with Marrafuschi identifying medium-hard-hard as the favoured option, with a first stop between laps 15 and 21 and a second between laps 38 and 44.
Max Verstappen is the only driver who no longer has two fresh sets of the hard compound available, after he was the sole driver to run hard tyres during Friday practice.
A three-stop strategy remains a theoretical possibility but carries risks, with Berra warning that fighting through traffic on older rubber could lead to higher overheating and ultimately greater degradation.
“You risk to overheat the tyres more, to try to push and overtake the car in front. So, you risk to end up with higher degradation levels, so it’s not very effective in the end,” Berra cautioned.
The Barcelona Grand Prix is shaping up to be the first race of this new era in which tyre management, rim technology, and set-up philosophy combine to determine the outcome on Sunday.