Bicycler wrote:You could carry two sets like R2 says and have tyres for each occasion. But if wanting a single set of tyres and wanting them to be sturdier than the marathons I'd be looking at the Marathon Mondial which is available in 700x35c and 700x40c. They are really designed for the kind of laden mixed terrain tour you envisage.
But IME ponderous and slow on tarmac and on wet tarmac more so,though a lot of people use them for 'expedition' touring