Mercedes technical director explains the reason for struggles at the US GP

Mercedes technical director James Allison has explained why Mercedes struggled so much at the recent United States Grand Prix. The Brackley-based team seemed solid on Friday, but their weekend deteriorated after that. George Russell crashed out of qualifying, as did Lewis Hamilton in Sunday's race in similar incidents. To the naked eye, it seemed like Mercedes's new upgrade package had failed drastically and robbed the car of all rear grip. Technical director James Allison has reassured Mercedes fans that the upgrade package was not the root cause of their issues, as he explains.