Défi X Sport Drôme is a small off-road race held in the Drôme, centered on La Touche and the Marsanne trails near the Col de la Grande Limite on the D57. Recent editions are scheduled in the winter section of the French trail and mountain-bike calendar, with one edition noted for February. The event features a 10 km trail run and a vétathlon, a run-and-mountain-bike race open to solo participants or relay teams.
The courses follow natural paths around Marsanne. The bike segments may incorporate private tracks, accessible only with landowner permission. Respecting these agreements is crucial for the event's continued use of the course. The participant field is local and modest in size, not large; the most recent listed edition saw 248 starters on the trails. Electric-assist mountain bikes are not permitted, ensuring the vétathlon tests riders' physical ability and bike handling skills rather than reliance on electric power.