It's not natural. I have Alex rims and had the same problem. I got some MAxxis folded bead tires and those appear go one a little more smoothly. But they're still more a pain in the butt than my Araya rims. Also as a general warning, if they're the Alex double-walled presta rims, know that in the Alex models I've seen, the outer(hidden under the tire) wall is drilled schrader and the inner (the hole you see the stem emerge from) is drilled presta. I run 120 psi and was constantly blowing flats at the stem... the schrader hole was allowing the stem base to shoot up too far and popping and tearing the tube rubber in a way that can't be patched. At first I thought there was debris or a sharp edge at the hole, but no, it was just the design. I drilled the inner hole schrader and put in a scrader to presta adapter and that appears to have solved the problem for now.