I most like 28 or 30 mm for pavement. I have a Poprad that I use for easy path/gravel and chores, it has 32mm GK's on it. I tried the same tire in 35 mm, but it was too tight. Reality for me, tires with an actual width, when mounted, of 28 to 32mm are optimal. I still have one bike with 25mm, most 28 are too tight at the fork crown, and when I ride it, I enjoy being on the skinny tires on a classic steel bike, a Lemond Tourmalet.