Originally Posted by
big john
So the only tubeless tires I have installed or helped to install have all had tubes in them. Since the tire bead is the thing you are trying to stretch over the rim and the tube is (hopefully) not between the tire bead and the rim bed, how does the tube make the tire harder to stretch? Especially during a roadside repair when one bead is still stuck to the rim.
Let's be clear about something. Not all tubeless rims are the same. The Mavic UST design is a special thing. Your experience with one type of tire or rim does not have much to say about any other specific case.
Surely you are aware that fitting a tight tire requires putting the bead into the center channel of the rim? If there is a tube present and the center channel is shallow, it prevents putting the bead as deeply into the center channel. Particularly near the valve.