I leave the external rib on, mainly as it is easier to locate the foam on the rim. I cut the rest of the ribs off.
I use double sided carpet tape on the rim, if you blast the inside of the foam and the tape, the tyre will slide over the tape and give you enough time to 'adjust', I never trim down the foam until on the rim, I also trim as the tyre won't be round when fitted and round the shoulders. Aslo, when you look at the tyre, there is normally a shinny (sealed) side and an open side.... I put the sealed side outwards.
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