Randonnées Du Bon Saint Arnoult (bsa) - Saint-arnoult-en-yvelines 2026

Randonnées du Bon Saint Arnoult is a one-day September event held at the stadium in Saint-Arnoult-en-Yvelines, southwest of Paris. It is a cyclotourist outing, not a mass-start race, offering options for road cycling, mountain biking, gravel, and walking. Registration is open from early morning until lunchtime. Most cycling options allow online entry; walking and the shortest 12 km VTT route have different registration procedures. Adult entry fees are reasonable, with reduced rates for licensed riders and free participation for those under 18. The route selection is the primary attraction: road cyclists can select from several distances up to approximately 94-95 km, gravel riders have 60 km or 80 km choices, mountain bikers can opt for routes ranging from 12 km to 70 km, and walkers have 8 km or 10 km options. The elevation gain varies significantly, from gentle short routes to a 70 km VTT course featuring about 1,100 m of climbing and an 80 km gravel route with around 900 m. The longest road route is not marked on-site, requiring participants to follow a provided GPS track. US St Arnoult Cyclotourisme organizes the event, contributing to a local club atmosphere where serious riders, casual cyclists, and walkers share the same starting point.