BBC Kubica lost Sirotkin because of the tires
Expert BBC Andrew Benson believes that Robert Kubica lost to Sergey Sirotkin in the fight for a place at Williams because of problems with the new tyres Pirelli.Andrew Benson "the Main problem of Robert speed in qualifying mode. In the car with empty tanks he has failed to achieve a significant improvement in time. He complained to his Manager on the problems with rubber.There is nothing unusual. All pilots have difficulty adapting to the new Pirelli tyres, and the pilot, who for six years have not acted in Formula 1, even more difficult. In the end, Williams decided that Kubica is unlikely to cope with their work and chose Sirotkin".An official statement on Williams Sirotkin is expected in the coming days.