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I read somewhere that these favour tubeless tape (rather than standard rim tape) when using tubes. Certainly my adventures with these rims and Velox tape failed dramatically, never again will I use Velox... (I have a few rolls spare if anyone wants them). Been difficult but achievable with tubeless tape- both Veloflex Corsa and FMB mounted in the end, albeit much narrower than your 32s.
FYI, these are notoriously difficult, so much so that they redesigned the 2021 rim based on feedback. Or maybe it's just good marketing to combat online comments!
Engineering101-
Thanks - this is reassuring in that my idiocy isn't to blame this time round. Except maybe for getting the rim in the first place! Swapped the Velox for a more slippy plastic rim tape yesterday but still no luck getting the tyre to sit in the shoulders rather than channel even with water and then talc as a lubricant. Will try tonight to pack out channel. Even if I get it sorted though, it makes me worried about getting a puncture out & about...
adamdenw
Just finished a wheel with Ambrosio P20 rim, put a tubed Gravelking 32 slick on (really tight) and it won't seat properly - one side of the 'bead' always favours the channel in the centre of the rim (much deeper than other rims it seems?) Have tried: riding around at 30 psi to squeeze it out to its place/ rolling by hand/ increasing pressure to 100psi to pop it in - no luck. Thought about slicing a rim tape in half to pack out that middle channel a bit so it's relatively a bit less attractive a place for the bead to sit, but someone here maybe has other tips?