L'Enduro du Barn is a six-hour gravel race held at Le Barn in Bonnelles, located within the Chevreuse Valley. Participants navigate a 10 km loop, aiming to complete the maximum number of laps before the six-hour time limit expires. This can be done individually or as part of a relay team comprising up to three riders. The race is organized by La Chance, Le Rushclub, and Le Barn Hôtel. Its format emphasizes endurance over a traditional point-to-point competition.
The loop incorporates a blend of compact gravel paths, woodland trails, and local roads within the Barn estate. Overall rankings and the victory are awarded to the solo rider or team that completes the most laps. Participants have the option to arrive on the preceding day and stay overnight, allowing for a more extended visit with family, rather than solely focusing on the race. This event is in its second year, with the inaugural race having taken place under challenging conditions. A relaxed run is scheduled for Sunday morning for those who wish to participate after the main event.