The ATIF Challenge Lucien DUPRE is a road cycling ride held in Créteil, in the Val-de-Marne region southeast of Paris. Scheduled for September, it is a one-day cyclosportive-style event. Participants are welcomed between 7:00 and 10:00, with the event concluding at 15:00. The central point is Gymnase Nelson Paillou, and the welcome is given on Rue des Sarrazins.
Riders can select from three road routes: 50 km, 70 km, or 100 km. All routes are designated as easy, blue-level options, suggesting the event is more akin to a club cycling day than a demanding mountain race. Union Sportive Créteil Cyclot is the organizer. The entry fee is modest: adults pay 5 euros with a license or 8 euros without, and riders under 18 participate for free, licensed or not.