Prueba BTT La del Mazo

La Prueba BTT La del Mazo is a mountain bike marathon held in Miraflores de la Sierra, in the Sierra de Guadarrama north of Madrid, and is the second round of the Cactus 101 MTB Challenge circuit. The event offers two distances of roughly 60 km (long) and 30 km (short) of mostly fast singletrack and forest tracks through the pine forests and granite landscape of the Madrid sierra. It is classified as race, marcha and XCM marathon, scoring for the series ranking.