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@scherrit
Yup, these are a bit of a bastard, owing (as mentioned above) the the tyre casing's stiffness "between" the beads- so it won't make the requisite U shape that will drop both beads into the rim. 25mm in a narrow rim like an open pro is tough. The Park seating tool (vilified on another thread for some reason) will help seat the bead properly- it will let you grab the casing and man handle it inwards or outwards. Also, consider soapy water to let the bead settle evenly- as above they do occasionally crawl off the rim if not evenly seated. BANG! big mess if you had a slime filled tube in there....