I can understand cutting your losses and moving on, and here's hoping that'll be the end of the problem for you, but I still disagree about tire width being related to the problem. I run 27" x 1 1/8" tires on LP18's without issue. (1 1/8" = 28.575 mm) And if your problem is occurring on the rim side, when the bike isn't moving no less, it seems the tire is unlikely to be involved.