Dumont'en bike is a Sunday mountain bike ride held in Mont-Saxonnex, on the Morsullaz side of the village. It is designed for enduro mountain bikes and VTTAE (electric-assist mountain bikes), indicating a focus on off-road terrain rather than a road race or timed city event.
The Mont-Saxonnex mountain bike club organizes the event with the Happy Move association. The description notes this as the first edition, with local organizers Alexandra Lozes, Stéphanie Berger, and Delphine Broizat aiming to attract mountain bike enthusiasts.