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An open tubular is made like a tubular, handmade AFAIK, except where a tublar is closed up to make, well, a tube, and open tubular is not closed and a bead is added. Most regular clinchers are vulcanized, which is some form of industrial press process. A Veloflex tire comes out of the package pancake flat as opposed to a regular clincher which already has a “tire” shape.
The only sidewall failure I’ve ever had was on a Conti GP4000 (no, not trying to start one of those discussions!) and I blew up a pair of Michelin Pro Races when I hit a pothole at 25+ mph.
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