The "dainty" Montier-Ford has since been called "perhaps the best Model T-based speedster ever created from the pedestrian farmer's fliver". Thirty-three cars started the race; Montier and Ouriou finished in 14th place. Montier returned to Le Mans in 1924 with his modified Ford special, now fitted with 4-wheel brakes. Again Montier drove it himself with his brother-in-law Albert Ouriou. The Montier Special was last away as it proved difficult to start. The car retired on lap 40 with engine problems. The duo's third and final attempt at Le Mans, in 1925, was also unsuccessful as they were unclassified due to only completing 54 of the 117 laps required. Alongside the Le Man entries, Charles continued hillclimbing; and he and his son Ferdinand raced Montier Specials in the Coupe de la Commission Sportive event, a support race to the 1927 French Grand Prix. The Montiers turned their attention to racing Ford Model A-based Montier Specials in Grand Prix and endurance races at numerous events between 1929 and 1935. The cars had lowered chassis and many engine modifications. Both men entered – and both failed to finish – the 1929 Dieppe Grand Prix. Montier Senior finished 6th in the 1930 Belgian Grand Prix (a Grandes Épreuves event but not a championship event as no championship was awarded in the 1930 Grand Prix season), but was not classified in the 1930 French Grand Prix and retired from the 1930 San Sebastián Grand Prix. Championship races in the 1931 Grand Prix season were endurance races of 10 hours duration with 2 drivers assigned to each car. Montier entered the 1931 Belgian Grand Prix championship event with co-driver "Ducolombier", finishing 8th, 30 laps down. Montier also ran in two non-championship rounds that year: the 1931 Casablanca Grand Prix, which he did not finish, and the 1931 Dieppe Grand Prix where he finished 10th. Montier entered only one Grand Prix as a driver in the 1932 season, the 1932 Picardy Grand Prix where he finished 9th. A Montier Special with Ferdinand at the wheel turned up at the 1932 La Baule Grand Prix, however; the car on this occasion sported "two" engines "mounted in tandem for a total of 4072cc capacity" instead of the Ford Model A-derived 3.3L straight 4 used hitherto. No Grand Prix entries as a driver are recorded for Charles Montier in 1933, but Ferdinand entered the 1933 Dieppe Grand Prix in a Ford V8-powered Montier Special.