Frans Maassen was a professional cyclist from 1987 to 1995 twice., 1988 and 1990, he won the Belgienrundfahrt. In 1994, he chose the Tour de Luxembourg for himself and in 1991, the Amstel Gold Race. He became Dutch champion in the road race in 1989. Eight times he competed in the Tour de France, 1990, he won a stage.
Since 2005 he has worked as Deputy Director of Sport for Rabobank.