Birken Bike Race
📍 Innlandet, Norway
mtbgravelBeginner friendly
Date
29 August 2026
Distance
84 km · 41 km · 100 km
Difficulty
mtb
Fat Viking
Geilo, Norway · 30 January 2027
Difficulty: 5/5 — Brutal
This demanding winter ultra-endurance event in Geilo, Norway, offers 50km, 100km, and 150km distances across varied snow-covered terrain. Riders navigate snowmobile tracks, dogsledding trails, and unpaved snow-covered roads, pushing personal limits in challenging cold conditions.
Visit official site →- Distances
- 50km · 100km · 150km
- Surface
- singletrack, dirt, gravel
- Typical W/kg
- 2.5–3.8
Rider fit
Who it's for
It's for resilient, experienced cyclists seeking an extreme winter challenge, a test of mental and physical endurance, and a unique personal adventure in Norway's snowy landscapes.
Who will struggle
Those without extensive winter riding experience, inadequate cold-weather gear, or a strong mindset for prolonged hardship will find the Fat Viking exceptionally difficult.
Training focus
Training should focus on long-distance winter cycling skills, cold-weather survival, consistent low-to-medium intensity endurance, and developing significant mental toughness.
Are you ready for this race?
Compare your W/kg to see how you stack up against this race's typical level — and which races fit you best right now.
FAQs
What race distances are available?+
The Fat Viking offers three main race distances: 50km, 100km, and 150km, all starting at the same time.
What kind of terrain can I expect?+
The course is a winter ultra-endurance event on varied snow-covered terrain, including snowmobile tracks, dogsledding trails, snow-covered roads, and cross-country skiing trails.
Are there cut-off times for the race?+
Yes, each distance has specific finisher cut-off times; for instance, the 150km race must be completed within 32 hours, the 100km within 21 hours, and the 50km within 11 hours. Checkpoints also have individual cut-off times.
What support do checkpoints offer?+
Checkpoints are inside heated buildings, providing basic food like oatmeal, hot water, and an opportunity for rest, with several "bail-out options" available along the route.
Can I finish a shorter distance than I registered for?+
Yes, if you register for a longer distance (e.g., 150km or 100km) but finish a shorter one (e.g., 50km at CP1), you will still be recognized as a 'finisher' for the completed distance, though not in the official competition rankings.
Is there a training camp available?+
Yes, a 3-day training camp/workshop is arranged prior to the race by Geilo Aktiv (Nina), focusing on safe and efficient winter travel essentials and winter riding skills.
