I'm touring the C&O/GAP next month. I'm just wondering what is the largest tire anyone has put on a Trek 520. I'm thinking of trying the tour with a set of these in 37 mm.
or these in a 40 mm, folding bead.
My 520 is a 1994 model. The inside of the front fork and chain stays both measure about 60mm at the top of the tires. Of course, things move and flex when you hit a bump.
I have a set of Gilles-Berthoud fenders in a 40mm width which I would like to use, but might have to remove.