I'm on this thread because I just developed a major bubble in a 700 x 23 Schwalbe Lugano after about 300 miles, and wanted to find out if it is common. My max inflation was 120 and I think the rating is 110. I have the other one put aside, but after this I don't trust it enough to use it. It felt good, comfy for a 23c, but screw that. Thanks for reporting, Zoku260, maybe you saved somebody's face.