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@lae
Yeah I've anticipated that. My current bike can fit 700x28 tyres, and it's touch-and-go whether it'll take 650x42 tyres (built up a mock wheel/tyre to try it out) depending on how true the tyres are to size - bags of clearance at the seatstays but it scrapes on the chainstays.
My thinking was that the touring frame has chainstays which are 17 1/2" with 130mm spacing - just done a bit of quick CAD and with a 650x50c tyre, and assuming the tyre is as tall as it is wide, then... it'll be scraping the chainstays. Ah. 42cs will fit, but there are no 42c (or narrower) tyres with any tread.
26x2.0 should fit, or 1.8 for a ton of mud clearance. But then I have to have 26" wheels.