I would say that it is very much a road shoe course. It isn;t stony or what anyone would call "technical".
It is a hard pcaked surface and the only issies I have had in the times I have run on it arew if the weather has been poor in the lead up and bikes have rutted the top a bit, but even then it has still been very good.
From memory, apart from a bit near the start/finish and over the dam, you won;t see much tarmac.
Moggie, sorry I missed your earlier post, but I have been going with 2:09 to this event for the last 15 years, and even have a long service certificate from the Davos Tourist board to prove it
I wouldn't recommend the K21 as it is a rather hard course that revolves around the start point of the bridge. If you don't fancy the full C42, then you need the K30, which is the first part of the C42.
Andrew. I run the C42, although it does tend to change a bit from year to year. I have run in trail and road shoes and prefer road shoes. The terrain isn't rocky, or I wouldn't be doing it, being rather clumsy. If you want rocky, you need the K42
The paths and trails are mostly of very good quality for easy running, nothing technical like you would find here.