The Cross Duathlon Saint Aubin d'Ecrosville is a cross duathlon held in Saint-Aubin-d'Écrosville, Eure department, Normandy, located approximately 17 km from Évreux and 34 km from Rouen. The race format is run-bike-run: participants begin by running, transition to mountain biking, and conclude with a final run. Triathlon Pays du Neubourg is the organizing body, offering distinct routes for adults and children, with race categories including S, XS, Jeunes 1, and Jeunes 2.
The race route incorporates village streets and surrounding paths. In wet conditions, the off-road segments become a challenging mud course, demanding technical skill over pure speed. The event has reached its 250-participant limit, attracting a diverse field beyond local club competitors. Bib collection takes place at the Salle des fêtes in Saint Aubin d'Ecrosville. The closest train station is La Bonneville-sur-Iton. A notable image from the event captures its character: Tyméo Crambert and Aurélien Vauquelin, caked in mud, crossed the finish line together in the S format.