Stewart won the 1969 title easily with the new Cosworth-powered Matra MS80, which was designed by Gérard Ducarouge and Bernard Boyer, and corrected most of the weaknesses of the MS10.
Stewart gañou o título de 1969 facilmente co novo motor Cosworth no Matra MS80, que foi deseñado por Gérard Ducarouge e Bernard Boyer, e corrixía a maior parte das debilidades do MS10.