More tape layers might smooth the shape of the bead retaining lip in a way which makes it worse at its job
Good point.
Will try a getting the tyre wet to simulate conditions and drop the pressure, to see if it holds in place as is
Why not just whack a load of sealant in there, pressurise it and see if it leaks? I mean, if it was like my brand new WTB tyres, they'd have a punctured sidewall from new, but it was nice to know ;)
@giofox started
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More tape layers might smooth the shape of the bead retaining lip in a way which makes it worse at its job