Ultra Running Hub Isenburg, Germany · Saturday, September 26, 2026
Fixed Distance 50 mi
Der Ruf der alten Mauern - 90km
10 days to go
90 km Distance
2,400 m Climbing
8.1 Grit · Hardcore
What the course asks
Climbing rate 27 m / km
Rolling. Moderate undulations. Requires consistent effort across varying grades.
Typical conditions, September
Daytime high 20°C
Night low 9°C
Rainfall Mostly dry
Daylight 12 h 02 m of light
Regional 2001-2020 average for September — NASA POWER, grid elevation 294 m. Not a forecast.
The Aid Station
Course-specific beta from the community
This is a rolling course. Expect fast, runnable sections where rhythm is key.
With trail terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 90 km of trail with 2,400 m of ascent.
- Trail Running Shoes27 m of climb per kilometre — grip and rock protection before cushioning.
- Race Nutrition90 km of self-supported fuelling between aid stations.
- Hydration VestsPole attachment and chest-strap stability on steep ground.
- Trekking Poles2,400 m of ascent to walk up.
- Headlamps90 km almost certainly means running into the night.
Course Notes
Erlebe ein einmaliges Abenteuer zwischen historischen Burgen und Schlössern! Beim Ruf der alten Mauern erwartet dich ein einzigartiger Lauf, bei dem du nicht nur deine Ausdauer, sondern auch deine Orientierung unter Beweis stellst. Einen Tag vor dem
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