Extreme mountain unicycling – whatever you think of it, you’ve got to admit the photos are pretty epic!

Lutz rides along the edge of a precipice. Picture by Markus Greber

Lutz rides along the edge of a precipice

The trail frequently got so steep they had to jump. Picture by Markus Greber

The trail frequently got so steep they had to jump

Lutz and Stephanie approach the bivouac where they'd dumped some gear on the way up and were to stay the night. Picture by Markus Greber

Lutz and Stephanie approach the bivouac where they'd dumped some gear on the way up and were to stay the night

The trail was often stony and slippery. Picture by Markus Greber

The trail was stony and slippery in places

Full speed ahead! Lutz managed to ride every single metre of the descent, save for a short rope-climb and a few metres of scree. Picture by Markus Greber

Full speed ahead! Lutz managed to ride every single metre of the descent, save for a short rope-climb and a few metres of scree