Nilsbyen Race Weekend is a two-day cross-country mountain bike race in Trondheim, held in June at Nilsbyen terrengsykkelpark. TVK organizes it as the club's main national event. The XCO race is part of the Norgescupen with UCI Cat 1 status, counting for Norwegian cup racing and international ranking points.
The racing uses marked courses within the Nilsbyen bike park, featuring a stadium area and lap-based race formats. A separate short-course program runs on Sunday. The weekend attracts riders, teams, support staff, parents, spectators, and volunteers. Registration and team tent booking are managed via eQtiming, with results posted there after each race day.