ORAMM (The Off-Road Assault On Mt. Mitchell)
📍 North Carolina, USA
mtb
Date
24–26 July 2026
Distance
98.5km · 100.9km
Elevation
2,712 m
Difficulty
mtb
Butte 100 MTB Race
Montana, USA · 18 July 2026
Difficulty: 5/5 — Brutal
This 100-mile mountain bike race in Butte, Montana, features significant climbing and varied terrain, making it a challenging endurance test.
Visit official site →- Distances
- 100 mile · 50 mile · 25 mile
- Elevation
- 4,842 m
- Surface
- gravel, singletrack, dirt
- Typical W/kg
- 3.5–4.5
Rider fit
Who it's for
Experienced mountain bikers looking for a demanding ultra-endurance challenge.
Who will struggle
Riders unfamiliar with sustained climbs, technical singletrack, or extreme endurance events will find this race very difficult.
Training focus
Focus on long-distance aerobic capacity, climbing strength, bike handling skills on mixed terrain, and nutrition/hydration strategies for extended efforts.
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 are the available race distances?+
The event offers three distances: 100 miles, 50 miles, and 25 miles.
What kind of terrain can I expect?+
The race takes place on mountain bike trails atop the Continental Divide, featuring a mix of gravel, singletrack, and dirt surfaces.
Are there any cut-off times?+
Yes, strict cut-off times are in place at various aid stations for both the 100-mile and 50-mile races to ensure participant safety.
Is mechanical support provided?+
No, mechanical support is the racer's responsibility. Outside assistance from family or team members is not permitted once the race begins.
Are drop bags allowed?+
Yes, for the 100-mile race, drop bags are strongly encouraged and can be provided to aid stations by a deadline of Friday evening.
Are e-bikes permitted?+
E-bikes are not allowed in any of the races.