These look like the tires called Heidenau cats paws...

I had them on my Tenere (87 model) and thought I would share my feelings.
Firstly I am fairly inexperienced in muddy conditions.
On road in the wet or Dry, they were as to be expected fine. Lots of falling into corners, in the wet and dry on tarmac but found their place and allowed you to find a comfort zone in corners.
I am not saying that they inspired confidence in the wet on roads, but suitable

However they were diabolical off road in the wet. So bad in fact that I changed the direction of the front thinking that they had to perform better, but I was utterly wrong. half an hour later they were the correct way around, and still felt like I was on an ice ring.

On dry dirt the rear spun merrily but you had comprehensive control over the direction, it was awesome. Rooster tails and control
But
On acceleration in the wet the rear spun but not in a consistent manner, it went everywhere and was absolutely out of control.

My conclusion was that they were fine on and off road in the dry.
Ok on road in the wet, but off road in the wet - horrendous. Avoid like the plague.

Interestingly on hard packed irregular rock it was also fairly poor with little grip, and again little spun up control over the direction.

Cheers G