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Arc of Attrition by UTMB Perranporth, England, United Kingdom

Name: Arc of Attrition by UTMB
Start: 2027-01-22
End: 2027-01-24

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Arc of Attrition by UTMB

Course maps

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Arc 20K
Arc 50K
Arc 100K
Arc 100M

Foot race | 24 Jan 2027

30.5 mi

Distance

Elevation gain

328 ft

Elevation high

102 ft

Elevation avg

Trail/Dirt

Elevation loss

0 ft

Elevation low

17%

Climb factor

What is climb factor?

The climb factor for a course is the percentage of your energy used in hill-climbing compared to the energy expended running the flats.

This course has a climb factor of 17% over 30.5 mi, which means that the energy expenditure for the run is equivalent to running a flat 35.7 mi.

Climb factor is provided courtesy of Ben Crowell, who both authored climb factor's scientific paper and wrote the open source software for it. You can read more about it here .

Course last updated 9 Oct 2026

All values approximate

Distance & elevation data

The distance or elevation data not precisely what you expect for this route?

Data from a GPS device can be rough, especially in areas where the terrain (trees, canyons) interfere with GPS signals. And routes drawn on our maps are reliant on people marking trails from satellite images -- the details of which can be hidden by trees.

Elevation can be tricky too. Elevation data is stored on spaced topographical lines, and determining the elevation of a point requires computers to estimate based on how close the point is to the topographical line.

We mitigate this by calculating distance in 3-D (think Pythagorean theorem) and using mathematical techiniques to smooth the elevation data. We come close, but no one can be perfect with imperfect data, even in 2026.

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Arc of Attrition by UTMB - Arc 50K course map

Stats summary

Race distance	Distance	Ele gain	Ele loss	Ele avg	Paved	Gravel	Dirt	Narrow
Arc 20K	13.7 mi	2,487 ft	2,487 ft	262 ft	17%	77%	6%	55%
Arc 50K	30.5 mi	4,954 ft	4,649 ft	102 ft	8%	80%	12%	90%
Arc 100K	51.1 mi	8,786 ft	8,671 ft	164 ft	17%	72%	11%	78%
Arc 100M	106.8 mi	17,789 ft	17,546 ft	141 ft	20%	74%	6%	80%