Apparently most bike street tubless tires are designed to stay on the rim if they go flat, a few aren't. In the sense that you can hobble along at walking speed for quite a way and not wreck the rim. The tire will be hooped, but at least it stays on the rim and the rims OK. I had a link once to a table giving this information but lost it. I was wondering if anybody has a link to this info if they wouldn't mind posting it. Thnx Pete.