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Cheers for the feedback (you too @dancing james).
The rim in question is a Stan's ZTR Grail which is BST-R, which is probably at odds with the IRC Formula Pro X-guard in question (though I haven't died a jizzy death yet).
Happily I don't have to burden you with the old question of 'why does my tyre deflate', as these seem to hold the air considerably better than Schwalbe nightmares.
finger_jockey
You may be missing the bead retaining lip (arrowed in the drawing). It's in the UST standard, but seems to have gone astray in a great many so-called "tubeless ready" rims.