Originally Posted by
2muchroad
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.
Wider external width rims will also have wider internal widths and 28mm nominal sized tires will be closer to 30mm actual width. Like I wrote before, I doubt there are enough rim brake models with that much clearance for wider tires and rims to warrant many good modern aero wheel options.