-
Yeah I guess it can be done. Col Collective moaned a bit but got through. Your loop is pretty much what I was aiming for. I was solo, on road shoes, and the first 100 yards down from the car park back to the road had me sliding pretty badly at a crawl - didn't want to get into trouble over in the next valley without cellphone reception or ability to walk out. I've been heat-affected on a few rides and very wary of getting caught out again. I work near Interlocken, down by the 1st bank centre.
I've ridden Gross Dam a few times on 25mm tubs - larger tyres would make the descending a bit less stressful. We have offices in the Interlocken business park.