The Intermunicipal Cup 3H MTB Endurance is a mountain bike endurance race series held across six events in various municipalities including Alenquer, Loures, Mafra, Oeiras, Amadora, and Lisbon. The 2026 edition welcomes participants aged 5 and above, with categories for juniors, adults, masters, and e-bikes.

The races take place on circuits approximately 4 to 7 km long for the 3-hour endurance events and 1 to 3 km for juvenile races, with specific shorter distances for younger categories. The competition is open to both licensed competitive athletes and non-federated riders, fostering an inclusive amateur competitive atmosphere.

Alongside the endurance races, juvenile MTB races are held on the same days, providing a comprehensive event for all ages. The series awards points and prizes across categories, culminating in a final trophy ceremony recognizing top performers.

The Intermunicipal Cup 3H Resistance MTB is a mountain bike endurance race series held in 2026 across six events in various municipalities including Alenquer, Loures, Mafra, Oeiras, Amadora, and Lisbon. The final event takes place in Monsanto, Lisbon on October 25, 2026.

The race features a 3-hour resistance format with courses approximately 4 to 7 km long, alongside juvenile MTB races with shorter circuits from 500 meters to 3 km depending on age categories. The competition is open to licensed and non-licensed amateur athletes aged 5 and above, with multiple age and gender categories, including e-Bikes.

This series offers a competitive amateur atmosphere with point-based classifications and prizes for top finishers, supported by local cycling clubs and municipalities. Juvenile races run concurrently with the main events, providing a family-friendly environment.