The hunt for the rainbow jersey for the amateur peloton officially begins on the roads of Castellón. On March 22, 2026, The Millars Gran Fondo establishes itself as the only Spanish qualifying event for the UCI Gran Fondo World Series, a status that has sent registrations soaring toward a sell-out months in advance. This is no ordinary sportive; it is a high-intensity qualifier where the fastest 25% of each age group will punch their ticket to the World Championships.
Sierra de Espadán: The ultimate judge
The 158-kilometer route with 2,200 meters of elevation gain heads into the heart of the Sierra de Espadán, an environment that demands surgical pacing. While the course starts at sea level in Castelló de la Plana, the organization has designed a layout that reaches its boiling point at the Coll de la Ibola and, most crucially, the climb toward Salto del Caballo. This final pass, featuring leg-breaking ramps that shatter any group's rhythm, will weed out the contenders before a technical descent toward Onda and the final stretch back to the capital.
UCI Regulations and the 'Gun Time' factor
Unlike other mass-participation events where chip time is king, The Millars follows the law of pure racing: Gun Time. The clock starts for everyone the moment the starting pistol fires, forcing riders with podium ambitions to fight for a front-row spot in the starting pens, which are strictly organized by age group. UCI regulations are non-negotiable; only standard road bikes are permitted, with time-trial bikes and e-bikes strictly prohibited.
The prize for those who make the cut is more than just a finisher's medal. Those who finish in the top quartile of their category will receive the coveted official UCI medal, the credential that proves their international caliber. With ambassadors like Joaquim 'Purito' Rodríguez and Ibon Zugasti, the event has grown beyond its local roots, attracting 12% international participation and turning the asphalt of Castellón into a true proving ground for European endurance cycling.