[2] Merckx and his teammates won nearly all the major European races including the Tour de France, the Giro d'Italia, Milan–San Remo and the World Championship.

In 1981 De Rosa worked as technical consultant to Merckx, who began his own bicycle manufacturing company.

Demand for De Rosa bicycles from new markets skyrocketed in the 1980s - including the United States, Russia, Japan, Belgium, and Germany.

Subsequently, De Rosa's company outgrew the small workshop adjacent to his home, and moved to a larger space in Cusano Milanino, Milan.

For the 2018 UCI Season, De Rosa returned to professional cycling and sponsors the spanish pro-contintal team Caja Rural-Seguros RGA.

[6] For the 2020 UCI Season, De Rosa became an official supplier of road bikes for Cofidis, a World Tour team.