Gran Rondo NL - Longest Day Challenge 635km 2026

The Gran Rondo NL - Longest Day Challenge 635km is a 635 km mountain bike tour that begins in Tiel, located in the center of Gelderland. The event is scheduled for the longest day of the year, providing participants with maximum daylight for a full-day endurance challenge. The route circles Tiel, crossing varied and challenging terrain. Participants will be in the saddle for the entire day. This event is designed for experienced mountain bikers seeking a rigorous test of distance, stamina, willpower, and mental focus, rather than a relaxed off-road excursion.