SMV Trasierra Bike

The SMV Bike Trasierra (officially "Bike Trasierra") is a non-competitive mountain bike marcha organized by Club MTB Valdeiglesias in San Martín de Valdeiglesias, in the western Sierra of the Community of Madrid. The event offers three signposted route options across the Trasierra trail network, with technical singletrack and fast forest tracks of up to roughly 55 km. It is a long-established fixture of the regional MTB calendar that draws several hundred riders each edition.