Mercedes' Toto Wolff criticizes the FIA for allowing Red Bull Racing's controversial adjustable device to remain unpenalized.

Formula One's governing body on Saturday ruled out a deeper investigation of Red Bull's ride-height device while recognising it could not be sure there had been no breach of the rules in the past.

Mercedes team principal Toto Wolff has questioned the FIA after it came to be known ahead of the United States Grand Prix that Red Bull's RB20 housed a device t

Jerome MironThe content Toto Wolff Lashes Out at Red Bull’s ‘Outrageous’ Front Bib Adjuster: Mercedes Boss Demands Answers appears first here MagazineInternational

The Red Bull RB20 features a bib adjustment system that allows the team to change the height of the bib, which affects the airflow underneath the car. There is, however, no evidence that illegal changes were made to the bib height under parc ferme conditions.

Mercedes boss Toto Wolff has hit out at the FIA's decision not to penalise Red Bull for a controversial adjustment device at the Formula 1 United States Grand Prix. Wolff's team endured mixed fortunes during Sunday's action-packed race in Texas,