Hello all, this is my first post. I am looking to replace my (very) old 23mm tires base on a recommendation from the bike shop that fixed my flat.

My question is this: I have heard that 25mm tires ride noticeably smoother, but it seems not everyone agrees on this. I don't know yet whether my frame (Cilo road bike from many years ago) would have the clearance to take a 25mm tire.

Can anyone tell me their experiences with 25mm Vs 23mm tires ?