Chaumont-Gistoux, Belgium · Saturday, December 5, 2026

Fixed Distance 100K

Trail du BW - 100km

28 days to go

100 km Distance

1,780 m Climbing

7.7 Grit · Hardcore

50.6775° N, 4.7212° E© OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 18 m / km Rolling. Moderate undulations. Requires consistent effort across varying grades.

Time limit 17 hours 10:12 min/km average. Generous. Walkable throughout for most of the field. About average for a 100K. Measured against 233 races of the same distance. Cut-off calculator →

Typical conditions, December

Daytime high 5°C

Night low 0°C

Rainfall Mostly dry

Daylight 8 h 13 m of light

Regional 2001-2020 average for December — NASA POWER, grid elevation 177 m. Not a forecast.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a rolling course. Expect fast, runnable sections where rhythm is key.

By UltraHub Expert

👟 gear

With trail terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert

🥤 nutrition

For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

By UltraHub Expert

Gear for this race

Chosen for 100 km of trail with 1,780 m of ascent.

Trail Running Shoes100 km of trail — cushioning that is still there in the last quarter.
Race NutritionPast 100 km the palate quits before the legs do — carry more than one flavour.
Hydration VestsFlask capacity for 100 km, without the bounce.
HeadlampsA 17 h limit puts you out there after dark.
AccessoriesChafe and blisters end more 100 km races than fitness does.

Adidas

Terrex Agravic Speed Ultra

RunRepeat found the Adidas Terrex Agravic Speed Ultra to be perfect for midfoot and forefoot strikers, while iRunFar noted that the shoe feels incredibly effici…

★★★★★ 4.5

Salomon