1924: an individual entrant

Fontan rode the 1924 Tour de France as an individual entrant, but he did not finish. He was assumed to already be too old for such intense competition, plus being handicapped by being less known outside the south-west.

1928: a win in the mountains

He rode the 1928 race for a local sponsor, the Elvish bicycle company. His team was so poor that he lost time looking after the others. He could not leave them to themselves because the seven flat stages were run as team time trials,^[7][8] the organiser, Henri Desgrange still trying to find a way to stop riders taking much of each day steadily and racing only as they neared the finish. The American historian Bill McGann wrote:

Desgrange... wanted the Tour de France to be a contest where unrelenting individual effort in the cauldron of intense competition resulted in the supreme test of both the body and will of the athlete. Desgrange was convinced that the teams were combining to fix the outcome of the race. At the very best, even if they were honest, they helped a weaker rider do well. He also felt that on the flat stages the riders did not push themselves, saving their energy for the mountains.^[9]

The rule not only separated weak teams from the strong. It favoured weak riders who could be pulled along by stronger team-mates and handicapped strong riders, like Fontan, slowed by having too few good riders to share the pace-making. Only when individual racing was allowed as the Tour approached the mountains could Fontan ride at his own level. He won the stage from Les Sables d'Olonne that took the field within distance of the Pyrenees at Bordeaux.^[6] The Pyrenees were his local climbs but he was so far behind the leaders – 1h 45m – that the favourites disregarded him when he raced off alone from Hendaye, on the Spanish border, to Luchon. He took seven minutes on Nicolas Frantz of Luxembourg.

Fontan finished seventh in Paris, 5h 7m 47s behind Frantz, who had led from beginning to end.^[7][8] But deduct the time by which Fontan had been delayed by his team compared to the strength of Frantz's Alcyon team and the positions could have been reversed.^[10]

1929: distress of the yellow jersey

The 1929 Tour de France had 22 stages, the longest over 366 km, and lasted 5,257 km.^{[n 1]} Team time-trials were dropped for all but three stages,^[11] except as a threat should any stage be ridden at less than 30 km/h.^[3] Fontan rode as an individual entrant. Freed of looking after others, he received the yellow jersey as leader of the general classification at Bordeaux, where he had won a stage the previous year. A unique problem faced the organisers because Frantz and André Leducq had been in the same leading group and all three had the same elapsed time. For the only time in the Tour de France, the yellow jersey was given to three riders on the same day.^{[n 2]}

The novelty lasted only a day. Gaston Rebry escaped next day with two others and took the lead, although the three previous leaders were now equal second.^[6] A day later, Fontan was back in the lead. He wore the yellow jersey again for a stage of 323 km that started before sunrise. He rode seven kilometres and then fell. Some accounts say he rode into a gutter, others that he was knocked off by a dog. The fall broke his front forks and the rest of the race rode by. Fontan was entitled to ride a replacement bike but only if he could show the irreparable damage to judges.

The judges had passed and Fontan had no second bike. He reached a village and walked from house to house, knocking on doors before dawn to ask for one.^[12] When a villager obliged, Fontan set off through the Pyrenees with his broken bicycle on his back. Eventually it became too much and he gave up at 6am. He sat by a village fountain at Saint-Gaudens and sobbed. It was the first Tour to be covered by radio and he was found there by Jean Antoine and Alex Virot of L'Intransigeant, who were broadcasting for Radio Cité.^[13] The recording of Fontan's sobbing was broadcast a little less than two hours after it had happened and led Louis Delblat of Les Echos des Sports to write:

How can a man lose the Tour de France because of an accident to his bike? I can't understand it. The rule should be changed so that a rider with no chance of winning can give his bike to his leader, or there should be a car with several spare bicycles. You lose the Tour de France when you find someone better than you are. You don't lose it through a stupid accident to your machine.^[14] Next year Desgrange modified the rules.^{[n 3]}