Wanted to update this thread and clarify an error I made in the root cause of my rash of blow outs on my Fulcrum 5 wheels with Rubino Pro III's...latter rear tire only having a couple of hundred miles on it if that.

So what happened? I thought it was the rear wheel seam mismatch that caused the blow out, but I was too hasty in my conclusion. Yes the 18.5mm wide rim tape that came on this wheelset was shifted over exposing the seam on one side which I did feel to be excessive. But I performed the usual due diligence sleuthing of where the blow out was occurring in each of three failed tubes. As it turned out it was not at the wheel seam but rather a couple of inches from the stem...the same for each failed tube. So...I tracked this position to a couple of inches adjacent to the tire label that I always align with the stem...why we do this and what did I find? A very fine slit in the side wall about 1/4" long. Each tube didn't have a pin prick but rather a small bite out of it. What was happening was....when the tire filled, this cut expanded and as soon as I put my weight on the bike, it bit down on the tube and blew a hole it.

Since I removed the rim strip from the wheel to get a better look at the wheel seam mismatch, I took a very small diameter tight roll of 150 grit sand paper and knocked that burr seam down and made it almost perfectly smooth and then reinstalled the one piece urethane rim strip. Fulcrum could do a bit better with their factory rim strips which are thin and not really wide enough and also without adhesive to keep them centered. Velox would be better and honestly stay in place better versus shift...I find the Fulcrum strip a hint undersized in width as well. Take a look Fulcrum owners if/when you do a tire change.

Back on the road with fresh Vittoria Rubio Pro III. Never got a cut in one of these side walls before and have ridden Rubio Pros for years. But it was clearly the tire and not the rim that was at fault. But the burr in the wheel seam and lack of complete rim strip coverage was a less than ideal condition and no doubt unfriendly to long term tube survival.

PS: One email and one call to Fulcrum and no response to either so far. Thanks to everybody that responded for your advice.