Originally Posted by
Trailroaster
Lack of 'stability' could be caused by a too narrow rim. What's the width of your rim? A 32mm wide needs something like a 20 or 21mm width rim if not beads get seated but sidewalls are in wrong position and can cause squirmness.
I suspect that you're right and this is the culprit. I don't remember the width of my rim offhand, but I know that it is less than 20mm (I'll measure it when I get home later). I did check before ordering the tires and they fit nicely into the rim width chart that I found on Sheldon Brown's website, but maybe it was on the skinny side...