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dancing james
If you have a proper tubeless rim it is confidence inspiring. The only punctures that cant be fixed externally that the sealant wont seal are the ones where the tyre is beyond hope and beyond the help of an inner tube. I have made all these errors hippy. If you have to put a tube in you are doing something wrong. Tyres wont unseat with a good tyre rim combo. IRC/schwalbe + kinlin plus the carbon rims I use are very secure. I have had issues with tubeless unseating on HED and fulcrum rims. Some seating issues with some DT Swiss rims but they seem secure once on. Zipp, Renoylds, ENVE's I have not had the chance to test throughly yet. MAvic UST is next the problem is I have too many wheels and I am one man. I can only ride one bike at a time.
I have learnt the hard way what the interface needs to feel like for it to be secure. If the bead is properly seat you can ride at 15 psi without a tyre rolling off. You have to ride the tyre flat for it to unseat and even then it does not happen straight away.