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Re: "They are packed (in a wrapper) to pull the beads together (and protect during shipping), but they had put the tire so it didn't wanna seat the bead (while inflating through the stem). I recommend unwrapping & let them relax. Or prop them open to relax them somehow (maybe some small wood sticks?)."
Put them out flat in the sun to make them flexible. Heat both sides, lube the bead and they'll be a lot easier to mount. I do this all the time for motorcycle tires and the same when I've mounted car tires.