Originally Posted by
chaadster
No, that is not correct. IRC, for example, use a butyl lining to make their tires airtight. I’ve also run previous versions of Schwalbe One without sealant and Hutchinson Fusion 5 Galactik as well, presumably due to a butyl lining, but it may have been some other material making those airtight.
https://ircbike.com/pages/technology
From that page:
Tubeless...Liquid sealant is recommended, but not necessary.
Tubeless ready...When being mounted without an inner tube, liquid sealant must be used.
I don't know why you'd run a TL tire w/o any sealant.