Originally Posted by rpenmanparker

Forgive me for sounding like a dunce, but what are you guys talking about? I don't doubt you know what you are doing, but I can't make any sense of it. In 30 years I have never had a problem with any tire I have mounted. Just get it on the rim, both sides of the bead, and inflate. Always right. Or at least right enough for me. Sometimes the tire pops into place, sometimes it is just there automatically. Old Specialized folding tires from the mid-80's, Michelins of various folding models, Conti GP4000, etc. I never even bother to look anymore. Whoops, I guess I shouldn't have said that. No kidding, I don't understand what this is all about. Witness line? I feel like I woke up in the Twilight Zone. Please clue me in.