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Might have exposed the edges of the tape to the edges of the tyre. Hmm.
Yeah - this is where you might find the tyre pushing the tape off the rim when you come to dismount it. Which sucks.
I think in previous set-up guides I've suggested trimming the tape back so it sits flush with the rim bed, partly because I believed the 'bead hook' was involved with retaining the tyre, and tape riding up the hook would somehow interfere with the bead lock and increase the chances of a blow-off.
But now I know the hook isn't such a big deal, and that the tape gets compressed flat anyway, I'd recommend against that, and let the tape ride up towards the hook to improve the durability of the install.
Or something.
But thinking about it, you may be right - I've always trimmed the tape to have it not go up the sidewalls. Might have exposed the edges of the tape to the edges of the tyre. Hmm.