Racing
© Jonathan Borba
George Russell completed 113 laps and set the pace on the opening day of Pirelli’s key Silverstone test for Formula 1’s 2027 dry-weather tyres, while Carlos Sainz lost valuable running after a technical problem cut short Williams’ programme.
The first of two post-British Grand Prix test days carried extra weight because Pirelli is now deep into the process of locking down the final tyre construction for dry conditions. That decision has to be made in the coming weeks, with manufacturing lead times pressing and the regulations requiring the specification to be frozen from September 1.
Russell handled the most extensive workload on Tuesday, covering 665 kilometers across 113 laps in the Mercedes and posting a best time of 1:30.695. That was quicker than the fastest lap recorded in Sunday’s race at Silverstone, which stood at 1:31.777, and underlined how much track time Mercedes was able to give Pirelli as it works through one of the final stages of development.
Sainz’s day was less productive. The Williams driver completed 61 laps and set a best time of 1:33.567, but Pirelli said only that a technical problem had limited his running. No further detail was given, leaving Williams with a shortened contribution at a point when every lap matters in shaping the final 2027 package.
Pirelli divided the day into two distinct phases. The morning focused on “triage laps,” also described as screening runs, before the afternoon shifted to evaluating “promising solutions” over longer race-style simulations. The work was carried out in demanding conditions, with track temperatures reaching 46C at Silverstone.
That structure made Tuesday more than a simple mileage exercise. Early running was aimed at filtering through candidate constructions, while the later long-run work helped Pirelli judge which options could hold up over race distances. With the deadline to finalize the dry-tyre structure approaching fast, the value of a clean, uninterrupted programme was obvious.
Russell was therefore able to give Pirelli a full benchmark day at a critical moment in the test programme, while Sainz’s interrupted session left Williams with less influence over the final evaluation than planned. The Silverstone test continues on Wednesday, when Kimi Antonelli and Alex Albon will take over the Mercedes and Williams cars for the second and final day.