Nico Rosberg said the reason Mercedes used its race drivers during its disputed test for Pirelli was to provide better feedback for the tyre manufacturer.
Ferrari used Pedro de la Rosa instead of Fernando Alonso or Felipe Massa for their similar test which was conducted with a two-year-old car.
Asked why Mercedes did not turn to Sam Bird, who had performed other tests for them, instead of their race drivers, Rosberg said: “I don’t know, that was what the team decided.”
“I think also for Pirelli it’s better if we’re in the car because it’s more representative because Sam doesn’t drive much so for sure he won’t be able to go on our pace and bring the Pirellis through the laps exactly as we would without the experience of the Grand Prix that we car, also.”
“So definitely for Pirelli it’s an advantage to have us in the car I would say, yeah.”
However when asked why he and team mate Lewis Hamilton used “anonymous” helmets during the test Rosberg said “I don’t want to comment on it.”
The Monaco Grand Prix winner expects this weekend’s race to be strongly influenced by tyre performance again: “It will definitely be one of the key aspects of the weekend.”
“We have the super soft again here, degradation is going to be an issue and possible that’s going to be the decider to who wins the race – who has the best control over that.”
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