My instincts tell me that a wire bead tire is less likely to blow off of a rim than a folding tire, all else being equal. But does anyone know if that is indeed true? We live in an area with a lot of long steep hills. Our tandem has rim brakes front and rear with an Arai drum brake on the rear as well. We run 28 mm gatorskin tires. Total team plus bike, etc. weight is roughly 350 lbs. We've never had a problem with this set up, and safety is a higher priority for me than speed. But I'm still curious whether we would have less safety margin if we ran lighter, Kevlar bead tires like the Ultremo ZX, for instance, or Conti 4-seasons.