I just got a Continental TKC-80 mounted on my front wheel. It had a hop so I pumped it up to 50 psi and the bead finally seated evenly all the way around. Then I let all the air out and the tire bead fell off the rim all the way around, both sides. I'm used to a tire staying seated on the rim and having to beat on the thing to get it off. This is a stiff sidewalled, fairly heavy duty dual sport tire, 90/90 - 21. Is the tire just reverting to it's stock shape because it's only been on a rim overnight, and it will stay on the rim seat where I want it once it's used to it's new home? Or do I have a problem that's going to get serious as soon as I lower the pressure down to about 14 psi for dirt?