Join Date: Aug 2006
Location: Cincinnati Ohio
The only thing that holds the bead to the rim is the internal pressure in the tire. (And to a very much less extent, the friction of the tire bead on the rim. I have seen guys who put soapy water on the tire and rim when mounting the tire experience a bead loss in circumstances that surprised me).
I think the sidewall stiffness means zilch. When an C or an E rated tire is flat, its still a pancake. And, since you can pinch a C or an E rated sidewall together with your fingers, I don't think it makes any difference at all in de-beading.
03 Rubicon; 99 xj with too much stuff to list; Unimog 406 (gone)