What 19.5 tires are you refering to i have been looking for some for my truck. I know that you can not air them down i have blown 4-5 beads b/c I was aired down to far the 19.5 rims do not have the safty bead on them to keep the bead on the tire. the lowest I can go down before the bead goes is about 60 psi on the back and 70psi on front[/QUOTE]
I was running Goodyear G-124's previously. Good tire, can't air down period and are not made to air down as the steel side walls won't tolerate it. The Conti's I'm run at 70-75 psi for highway and around 45 psi off highway/off road. I probably could go a little lower, but I've never popped a bead, nor want to in the boonies without a truck tire shop nearby...