Originally Posted by
icemilkcoffee
You are right! I did not know these existed.
Not super common, I know Nino Schruter raced with them but I don't know others who did (but only for ignorance not because I have researched it). I think it does kinda make sense and now have been seeing tubeless tubulars which are really neat in that context as they can't come off the rim and are tubeless so you can run lower pressures with fewer flat risks. I don't see it being practical for everyday users but it is a neat concept.