Jenson Button reckons a lack of balance cost him during qualifying for the Hungarian Grand Prix.
Showing signs of improvement throughout the weekend's practice sessions, Button was unable to turn that into a solid qualifying peformance.
While his team-mate Sergio Perez put his car up into ninth place, the Brit failed to make it into Q3.
Button will line-up 13th on the Hungaroring grid, citing a lack of balance as his biggest problem on Saturday.
"On old tyres the car was well balanced," Button told the BBC. "You stick new tyres on and it changes the balance of car.
"We've done a good job of adding downforce to this car but balance is tricky."
He added: "Perez did a good job."
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