Originally Posted by
unterhausen
If by fully supported tour you mean that all you carry on your bike is food and spare tubes, I would probably go with 25mm. I am considering going with larger tires because I like to ride at night, during the day I find 25mm to be plenty wide.
I had 25 mm tires on my Trek Madone. I could not lower the pressure for fear of more flats on very bad pavement and the high pressure beat me to the point of fatigue.