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Second, I disagree
Nah, they're actually right, if your tape is the right width, the tyre sealing lip overlaps the tape and the sealant never contacts the metal.
On the other hand, for the reason shown in your picture, I'd never consider a pinned or sleeved rim for tubeless. Stick to welded rims at least, now that everybody has pretty much abandoned making genuine tapeless tubeless rims.
gbj_tester
Here to whine. Been tubeless since around 2008 and never encountered this. Bought a front wheel that’s branded tubeless. Set up in usual way. tyre seats. latex spaffs everywhere through join in rim. ring place i bought wheel, they say the tape should contact the tyre hence should cover split. i’m like whah? Firstly, surely, regardless of tubeless, this can’t be OK for a rim. Second, I disagree, the tyre initially contacts the tape then locks against the rim itself. tape obviously seals over spoke holes.