Yeh the variation of announced & real life size kept me hesitant of going for the 28s. And as my new rims are 18mm inner (up from 16mm) there was too meny variables to take chances of having a too tight fit.
but have to say those 2017 schwalbe pro ones are super fast! set up tubeless of course :-)
kind of regretting not putting 28s on my caad :-) there's enough of space at the front after all
plenty at the rear