In Bordeaux he founded the Veloce Club Bordelais and was one of the founders of the Ligue française d'éducation physique.

On 6 September of the same year he started on a Clément bicycle at the first edition of the 1200-kilometer race Paris-Brest-Paris.

First, he led an hour ahead of Charles Terront, but could not hold this because he had to take a break due to exhaustion.

Duncan, however, instructed his rider to drive around the hotel where Jiel-Laval was sleeping in order not to be seen by his companions.

A year later, his widow left the bike on which her husband lost Paris-Brest-Paris to the Musée des Arts et Métiers in Paris.