So I spooned my rear off with 12200 miles on it, would have done another 400 -500 if needed easily.
Found these tires to be mint across the board which is shingle road, moab bed rock, tar, mud and slime.
For reference we are running the 140/80-17 (which doesn't fit according to the books) which has the centre ridge wear strip.
We are running 14 tooth front with 44 tooth rear and std chain with no clearance issues whatsoever, for me 5 stars on the K60 and I have just spooned on a nice new round one
With the strength of the bias ply tire and milage we are getting with house and contents on we won't bother looking over the fence at other brands unless we cannot get Heidenau.
Old and new beside each other, anyone have any queries I will answer them based on our usage.