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Just wondered if I was missing something
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.
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gbj_tester
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the hook-less Lightbicycle ones I have got that ^ which is a copy of some Enve rim. / csb
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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.
amey
finger_jockey
My experience so far is that if all the air escapes, the tyre deforms under the loss of pressure and the seal fails. I usually end up pushing about 110 psi in, so that there's still a chance some air will still be present once I get the core back in. Just wondered if I was missing something, no biggie.
Also, why do I always end up bending my Presta cores (the bit you undo to get air in)? Am I not supposed to fully undo them?