Jacques Bellenger won his first French national championship in cycling’s sprint event in 1948, which sent him to that year’s London Olympics. There, he was eliminated in round two of the sprint. After taking one more amateur title in 1949, in addition to winning silver at that year’s World Championships, Bellenger moved on to a successful professional career. At this level, he again won silver at the World Championships in 1951 and captured every French national championship from 1950 through 1955, except 1952. He also came in third in the 1954 Prix du Salon, second in the European Championships for the endurance omnium in 1956, first in the Prix Dupré-Lapize in 1957, and second in the Six Days of Buenos Aires in 1959, all with different non-Olympian partners.