Feb.22 (GMM) A feature of new supplier Pirelli's tyre wear could make overtaking difficult in 2011, world champion Sebastian Vettel has revealed.

The Red Bull driver said that the new tyres this year leave a lot of rubber 'marbles' off the racing line.

"At half distance (at races) there will be so many on the track that the adjustable rear wings won't help you," German Vettel told Auto Motor und Sport.

"It's because when you're off the line, you have to brake so much earlier," he explained.

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