Sebastian Vettel has played down the decision by Red Bull Racing to change his chassis ahead of the Spanish Grand Prix, insisting the process is 'not unusual'. The defending champion has endured a trying start to the season, dictated by a disastrous pre-season testing programme and being unable to exploit the same speed from the RB10 as new team-mate Daniel Ricciardo. Ahead of the first European round of the 2014 F1 season, Vettel will revert to a chassis used during winter testing, primarily to provide a back-to-back comparison to the outgoing car. With this in mind, the German is relaxed about the move and is hoping this weekend's race will allow the team to unlock more of the car's...
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