Originally Posted by
ticktockpedal
Is there some usual cause for tires jumping off the rim? I wouldn't have thought this would be likely, given how tight fitting and difficult this tire/rim combination is to mount.
Not seated properly.
When you mount a tire, the best way to prevent this is to inflate the tire to about 20 lbs or so, work the tire into the rim to make sure it's seated, and then inflate the rest of the way. Yes, it is possible to go as far as you did before it popped off.