Red Bull protest over Mercedes' Pirelli tyre test

Mercedes became the subject of controversy in the Monaco paddock on Sunday morning after it emerged they conducted a 1000-kilometre tyre test with Pirelli in Spain last week. Red Bull have lodged a protest with the stewards over the issue. In-season testing is banned under the Formula One regulations, but Pirelli say their contract with the FIA as the sport's official tyre supplier

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