Since the DUROs were almost like free cheap. I bought 2 rears and one front for my R100GS Mounted up the first set without tubes. Front is holding up Ok but the rear developed crackes between the Knobs on my first 1K trip. (mostly interstate some back road). I watched it and but didn't change it for about 2K more miles. When it statred to lose big enough pieces of rubber to see belts I changed it.
Second tire I added a tube. (they are tube type, although the first tire didn't lose air) This tire cracked and lost whole knobes on my first trip. I do live in southern nevada and the temp was around 110 F. I suspect that Duro just isn't able to handle higher temps. Adding the tube just made it worse. so we will try something else.