Rosberg: Fast-corner speed an issue

Nico Rosberg believes Mercedes has made good progress in understanding tyres at this week's Mugello test - but thinks his team needs to do more to improve its high-speed corner performance. With its experience in the first four races showing how important tyre management is, Rosberg and Mercedes spent a lot of time on the final day working on improving its knowledge of that area. Speaking at the conclusion of testing, Rosberg said he was upbeat about what could be expected for the next race in Spain ? although he was well aware that other progress was needed

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