So Schwalbe has said they made the 2019 version sizes to better reflect wider rims. I have a 2016 on front and 2019 on rear, both 25c. And it is noticeable that the 2019 version is not as wide.
I’m running HED Belgium wheels. 25mm external, 21mm internal. Just pumped the tires up to 70psi front, 80psi rear. Which is what I run in “most” cases. 2016 version measures 29.6mm and 2019 measures 28.0mm.
I would be interested to know if anyone else running the 2019’s have a “leaking” issue. If yes or no, I’d like to know what sealant they using and how long ago they were purchased.