Uh, no, actually I don't. If you had read my post carefully, you would have noticed I said that most of the information was gleaned from tire advertisements and sales pitches. I did make just one assumption, clearly stated as such, but it was actually founded upon personal observations and a basis of knowing how products improve over time. I have mounted both kinds of tires ad nauseum, and wire beads are looser than Kevlar ones; then Kevlar tires loosen up with use. It seems that effect is not as pronounced as it used to be. It also doesn't occur to the same extent in expensive folding tires as it does in cheaper one. Those are the facts as I have observed them. Why are you challenging my post if you don't have contrary information to share? But more fundamentally, in a round table discussion, why would proposing ideas about how something might work be wrong as long as the ideas are clearly labeled as assumptions or theories or what ifs? Food for thought!