Bisitak 31, kokapena 0
Nondik gertu Studen, Kanton Schwyz (Switzerland)
This is the area where Studen's cross country ski tracks are.
It is reasonably flat but the gravel areas have thick gravel which is quite slow.
There is a bit of asphalt too on narrow but very low traffic roads.
The gravel sections should really not be tried with any smaller wheels. They were bumpy enough with 20cm.