Hutchinson inner tube 25c, at 80 psi I watched the tire slowly going over the rim bead and I fretfully deflated it
I usually start seating the tyre with valve area, but maybe that isn't the last part you are showing in the pic.
Same, that picture was taken after I deflated the tire as it was coming off the rim, the other times it slipped off was not in correspondence of the valve..
@Squaredisk started
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Hutchinson inner tube 25c, at 80 psi I watched the tire slowly going over the rim bead and I fretfully deflated it