Jenson Button says McLaren made a mistake with its gear ratios after a difficult Italian Grand Prix.
The Briton finished in 10th position, having been unable to overtake the Toro Rosso of Daniel Ricciardo because his gears were too short. Button believes McLaren's pace in clean air was better than the result suggests, but admitted the short gears made it impossible to do any better.
"Today was tough. I think our pace was better than 10th, but we got stuck behind the Toro Rosso and couldn't overtake," said Button. "The problem was that as soon as the fuel load comes down, the straightline speed is far greater. As soon as we followed anyone we were in a difficult position.
"We got it wrong with the ratios and it's a problem we will hopefully solve for the next one. "When we are DRSing we were stuck at 331[kph], and everybody is passing by at 340. We made a mistake."
Button's race was also compromised after he flat-spotted his tires with 15 laps to go.
"It was like driving like Lego tires," said Button.
Teammate Sergio Perez finished in 12th position.