These are fat! 27mm measured width at 80 psi and 28mm at 95 psi on a Pacenti PL-23 hoop.
On my 1996 Bianchi Repart Corse TSX, they’re a tight fit. I had to back the rear dropouts out all the way, such as it was.
Test inflation pressures: 80/95 f/r.
Update: the first test ride ended badly with a small sidewall pinhole that didnt seal before I went out. I got to walk 😐