Originally Posted by
surak
Modern aero disc brake rims are most often optimized for 28mm and wider tires with external widths in the 31+mm range. I have doubts that many rim brake frames and brakes have clearance for that, so the options for rim brake wheels with decent aero shapes will be accordingly few and far between. Being able to make wider and more aero rims is one of the biggest gains that disc brakes enabled.
On my Emonda ALR 5 (2018) with rim brakes and 58cm frame height, I can fit 28mm tires no problem. The previous owner had installed them and there's about 3 - 4mm of clearance between the tire and the fork. It's a tight fit, but it works. And this ALR 5 is almost 6.5 years old.
I think reasonably new race/road bikes with rim brakes have frames that can support it.