Hard to mount, but easy to setup tubeless. One layer of Stan’s tape on a Pacenti PL-23 18C rim. I needed soapy water and a Kool Stop bead jack to mount them, but once mounted, they could be seated with a floor pump, and held air for 3 days without sealant. The measure 24.5mm wide.
My first ride, V laps around the cul-de-sac, was at 75f/95r for a 235lb rider on a 90’s vintage hand-built vintage steel Bianchi. 😉