Sebastian Vettel is set to drive his third new chassis of the 2014 season, after suffering more mysterious handling problems in Belgium last weekend.
As the extent of the reigning quadruple world champion's issues this year became clear, Red Bull had already given Vettel a new chassis for May's Spanish grand prix.
Now it was at Spa-Francorchamps, a race the 27-year-old won a year ago, that Vettel notably struggled for pace alongside his on-form teammate and 2014 Belgian GP winner Daniel Ricciardo.
"I can't explain why my car could not compete with Daniel's at this race," Vettel, referring to Spa, is quoted by Sport Bild.
"But there must be something. Both cars are identical...
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