This is a bit of a diversion from the simple search for narrow tires, but I was scratching my head at the idea that the calipers are a reason to not run anything bigger than 20mm.

I've got a bike with the short reach Campy brakes that are shown above, and the frame was designed for minimum clearance... i.e. the pads are all the way up in the slots.
Even with this configuration, I've managed to (barely) fit 25mm tires in there.
Admittedly, there's no room to spare, but it does work.



Steve in Peoria