The Intermunicipal Cup 3H MTB Endurance is a mountain bike endurance race series held in 2026 across six events in various municipalities including Loures, Alenquer, Mafra, Oeiras, Amadora, and Lisbon. The Loures event is scheduled for July 11, 2026, at 15:00 in Póvoa Santa Iria, Lisbon.

The race features a 3-hour endurance format with circuits approximately 4 to 7 km long for the main event and shorter circuits for juvenile categories, ranging from 500 meters for the youngest to up to 3 km for older youth categories. The competition is open to licensed and non-licensed riders aged 5 and above, with multiple age and gender categories, including e-Bikes.

The event is part of a competitive amateur series with point classifications and prizes for top finishers. Juvenile races occur on the same day as the endurance races, with specific start times and distances. The race atmosphere is competitive and structured, with safety and fair play emphasized.

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.