currently I'm riding some conti 23's on my old Gios Pista and I have less than 1mm clearance between the tire and the bridge near the top of my seat stays.
I have been encouraged to seek out a smaller tire. I see that the Conti GP Attack tires come in a 22, but on the web site, it refers to that as the front wheel size.
Any ideas? As crazy as it looks to have such little clearance, I don't see what sort of danger that could put me in. After all, it IS clearing.