I have nominal 25s on 21mm ID rims, which measure at just > 28. I run them at about 65 psi. They feel pretty good and the extra confidence descending on bad pavement is important, but my ass kills me after 50 mi the way it has for 40 yrs. At 65 kg, I see no need to use anything bigger and might not have the clearance on the road bike anyway. I commute and ride rough stuff on 36s, so I know what I’m missing.