"They're balloons now," said Lewis Hamilton of his Pirelli tyres post-70th Anniversary Grand Prix. "They're the highest pressures we've ever had on a track like that. I wouldn't be surprised if that was a thing for us, but I don't know if anyone else struggled with blistering like we had so it's something we'll look into."
And it's true. Between weekends, and perhaps in response to the softer grade of tyres being run and the trio of blow-outs last time out, the tyres had swelled up thanks to a change in the mandated tyre pressures.
For Silverstone's first race, Pirelli mandated a minimum pressure of 25psi at the front (approximately 1.7 bar), and 21psi at the rear - and for the second, those pressures were pumped up to 27psi and 22psi at the front and rear respectively. That's quite a lot of extra inflation in the mix, especially when you consider that last year's tyres were allowed to be about 23psi and 20.5psi front-to-back.