Royal Gorge Six & Twelve
📍 Colorado, United States
mtbBeginner friendly
Date
15 May 2027
Distance
10 mile loop
Elevation
2,527 m
Difficulty
mtbbeginner friendly
Fat Bike Birkie
Wisconsin, United States · 13 March 2027
Difficulty: 3/5 — Hard
Staged on the iconic groomed snow of the American Birkebeiner Trail in Wisconsin, this premier winter fat bike event challenges riders across 47km, 21km, and 10km distances. The course presents a unique physical test where conditions can range from fast, hard-packed snow to demanding soft powder.
Visit official site →- Distances
- 10km · 21km · 47km
- Surface
- dirt
- Typical W/kg
- 2–3.5
Rider fit
Who it's for
It is perfect for adventurous mountain bikers and fat-bike enthusiasts who want to experience a world-class groomed snow trail with a festive winter festival atmosphere.
Who will struggle
Cyclists who lack experience riding in sub-freezing temperatures or those who struggle with bike handling on loose, shifting snow surfaces will find this race particularly tough.
Training focus
Emphasize cold-weather endurance, core stability, and tire pressure management to maintain traction and control on groomed winter trails.
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 tire width is required for the race?+
Bicycles must be equipped with tires that are at least 3.5 inches wide to ensure they are suitable for the groomed snow conditions.
Are electric fat bikes allowed to participate?+
Class 1 fat bike e-bikes are permitted in the event. However, riders using them must notify the registration staff and will not be eligible for official results placement or podium awards.
How are the starting positions determined for the 47K Big Fat race?+
Riders are placed into four starting gates based on their best finishing times from the past three years. New racers or those without recent results are assigned to Gate 4.
Where does the event take place?+
All races start and finish at the American Birkebeiner Trailhead in Cable, Wisconsin, with access provided via Telemark Road.
Are there cut-off times for the courses?+
Yes, there are designated cut-off times at multiple aid stations along the course, with a final overall finisher cut-off at 3:00 PM.
Can I ride the course before the race weekend?+
Riding bikes on the Birkie Trail during winter is strictly restricted to the designated pre-ride and race days. For general winter riding, cyclists should use the nearby CAMBA mountain bike trail system.