I'm not sure about frames without cantilevers, I believe a Super Course might have room for 700x38c if you crimped the chainstay. I had 700x35c and fenders on mine.
Touring bikes don't have to just "tour," I've used my Univega Gran Turismo for some singletrack and gravel grinding. It just clears these 700x43c (actual width around 40mm on Sun CR-18 rims) Panaracer GravelKing SKs.
