The BajoCero Bike is a long-running winter MTB marathon held each December in Tudela de Duero (Valladolid), organized by Club Deportivo TudelaBike. The course starts and finishes in town and links singletrack and forest trails through neighbouring municipalities such as Traspinedo, Santibáñez de Valcorba and Montemayor de Pililla. Two routes are offered, including a competitive Gold route of around 55 km, and the race counts toward the Valladolid Provincial BTT Cup.
Date
Dec 20, 2026
Distance
65 km
Elevation
—
Difficulty
n/a