Sebastien Buemi and Kamui Kobayashi have both further fuelled the fire that Pirelli were ‘too conservative’ in their tyre choice for the Spanish Grand Prix.
Buemi was speaking following his first taste of the RB10, in the post-Spanish Grand Prix test, with the Swiss driver completing 54 laps on the opening day.
“We could see that maybe the tyres of Pirelli were maybe a little bit conservative,” he said. “But still I had enough laps to get a good feel.”
Despite not approving of the medium and hard tyre compounds however, Buemi declared himself happy with his days work, despite suffering a gearbox session mid way through the afternoon session: “It was a good programme; obviously it was the first day for me in the RB10 and new engine and power train. I experienced a bit of dry and a bit of wet.
“It was definitely a good day for us; even so we would have wanted to do some more laps.”
It was also a strong day for Caterham’s Kamui Kobayashi, who completed the third most amount of laps of anyone with 73; one shy of Jenson Button’s total for the day and seven shy of Mercedes’ Lewis Hamilton.
“We were quicker today [than in Sunday’s race] with heavy fuel-we definitely found more positives. The track temperature was quite different but at least we know that this lower track temperature worked better for us.”
Like Buemi however, Kobayashi felt the tyre compounds were too conservative to the point where him and the team’s upgrades for the two-day test were not effective: “It’s not working [the car] because the tyres are too hard. This is the biggest problem, and I think the track temperature was too high and it was difficult for us to heat the tyres.
Buemi and Kobayashi will now hand driving duties over on day two to teammates Sebastian Vettel, and Robert Frijins respectively.
Images courtesy of Octane Photographic