Unbound Gravel 200
📍 Kansas, Flint Hills, USA
gravel
Date
3–6 June 2027
Distance
200mi · 100mi · 50mi · 25mi
Elevation
2,800 m
Difficulty
mtbgravel
Grizzly 100 Big Bear MTB, Gravel & Gran Fondo
California, USA · 5 September 2026
Difficulty: 4/5 — Very hard
This demanding mountain bike race in Big Bear Lake, California features a world-cup style lap course with distances ranging from 30km to 100km. Serving as the National Ultra Endurance series finals, it presents a highly challenging mix of high-altitude climbs and technical descents.
Visit official site →- Distances
- 30km · 50km · 75km · 100km
- Surface
- singletrack, dirt
- Typical W/kg
- 3–4.5
Rider fit
Who it's for
It is designed for dedicated endurance mountain bikers and competitive racers who want to challenge themselves on high-altitude singletrack.
Who will struggle
Riders who struggle with high elevations, technical singletrack handling, or pacing over multiple high-intensity laps will find this race exceptionally difficult.
Training focus
Prioritize high-altitude endurance, repeated anaerobic capacity efforts for steep climbs, and sharpening your technical handling on fast descents.
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 distance and lap options for the race?+
The event offers four distances on a lap-based course: the 30k is 1 lap, the 50k is 3 laps, the 75k is 5 laps, and the 100k is 7 laps.
Are these races part of any national cycling series?+
Yes, the 100k race is the NUE Epic Series Finals and the 75k race is the NUE Marathon Series Finals.
What is the event's refund policy?+
The organizers do not provide refunds, but they will defer your registration to the following year if you are unable to attend.
What kind of course layout can riders expect?+
The race utilizes a world-cup style multi-lap format featuring climbs and downhills on the Maple Hills trails near Big Bear Lake.