Based on Friday’s long-run running, the Barcelona‑Catalunya Grand Prix is set to unfold as one of the most strategically complex races of the season, shaped by extreme heat, unusually high tyre degradation and Pirelli’s decision to bring a softer range of compounds than in previous years. F1Technical’s senior writer Balazs Szabo delivers his strategy guide.

Formula One’s sole tyre manufacturer Pirelli has decided to supply teams with a trio of compounds that are a step softer than what drivers had at their disposal last year.

It became evident early on practice day that degradation would become a huge factor on Sunday. Friday’s long‑run data already indicated that the Medium compound was dropping off by around three tenths per lap across the opening ten to twelve laps of a stint before degrading more sharply beyond that threshold.

Combined with the small performance deltas between the C2, C3 and C4 tyres, this has created a scenario in which outright pace matters far less than the ability to manage thermal degradation and avoid traffic at critical moments.

Qualifying took place in punishing conditions, with ambient temperatures reaching 30°C and the track surface climbing to 53°C. These record figures not only shaped the competitive order but also provided a preview of the challenges awaiting teams on Sunday.

George Russell secured pole position for Mercedes with a 1:14.679, just 0.064 seconds ahead of Lewis Hamilton, while Kimi Antonelli completed the top three, 0.319 seconds off the pole time. The heat played a decisive role throughout the day, and the morning’s final practice session offered the first clear indication of how teams were adapting their approach.

As Pirelli’s Motorsport Director Dario Marrafuschi explained, “The third free practice session was used by the teams exclusively with qualifying in mind. No one focused on long runs. Instead, everyone concentrated on single-lap performance, which they would later face across the three sessions in the afternoon.”

With all drivers except Nico Hülkenberg and Sergio Pérez running the Soft C4 in FP3, the emphasis was firmly on extracting peak performance from a single lap rather than gathering additional race‑relevant data.

The extreme heat also meant that tyre behaviour was far from typical. Marrafuschi noted that “as already evident yesterday, and confirmed today by some isolated attempts, it is not possible to improve lap time on a second run due to the high level of thermal degradation.

This is mainly due to the record track temperatures. The 53°C recorded today also explain why lap times were around nine tenths slower than simulations.

This inability to attempt multiple push laps on the same set of tyres will carry over into the race, where managing surface temperatures will be just as important as managing wear.

Against this backdrop, Pirelli expects a minimum of two pit stops for all teams, with several viable variations depending on car characteristics and track position. According to Marrafuschi, “looking ahead to tomorrow’s race, the likely strategies involve at least two pit stops.

Teams may start on a Medium-Hard combination and then decide, based on track performance, whether to finish the race on the yellow or white compound.

This Medium‑Hard‑Medium or Medium‑Hard‑Hard structure is likely to be the baseline approach for the front‑running teams, particularly Mercedes, whose long‑run consistency on Friday suggested they can control the pace from the front and avoid the worst of the traffic.

However, the Hard tyre may play a more prominent role than usual. Marrafuschi highlighted that “it is worth noting that most teams have retained two sets of C2 from yesterday, a compound that appears particularly effective on cars with greater downforce, albeit with only slightly lower degradation than the other two.”

This opens the door for teams such as Ferrari or McLaren, whose cars generate strong downforce, to consider starting on the Hard or extending their first stint significantly to gain a strategic offset. Such an approach could allow them to attack on Mediums later in the race when fuel loads are lighter and the track is more rubbered in.

There is also the possibility of a more aggressive strategy built around the Soft tyre. As Marrafuschi explained, “there is also the option of starting on the Soft, followed by Medium and Hard towards the end.”

This would prioritise a strong launch and early track position, particularly for drivers starting outside the top six, but the C4’s short lifespan and sensitivity to dirty air make it a high‑risk choice. The Soft is likely to last no more than eight to twelve laps in race trim, and any time spent in traffic would accelerate its thermal degradation.

A three‑stop strategy remains a theoretical option, especially if a Safety Car appears early in the race, but Pirelli does not expect teams to commit to it from the outset.

Marrafuschi summarised the situation clearly: “A three-stop strategy with three Soft stints and one Medium does not differ significantly from these approaches.

However, considering traffic and the need to overtake, it is unlikely that many teams will commit to it beforehand.” Barcelona remains a circuit where overtaking is difficult despite the long main straight, and the risk of losing time behind slower cars outweighs the potential benefit of running consistently on fresher tyres.