700x 42 is about the max that I feel comfortable with being able to fit a road crankset with a reasonable 430mm chainstay length. My personal Gravel bike has 650 x 47 tires with a 48/34 road compact and 425mm chainstays. I'm very familiar with the area that you are riding and the Terrene Elwood 650 x 47 tires are great for that terrain. My crazy friend creates routes that include the snowmobile trails near Williamsport and I'm glad to have the extra cushion for those rocky trails and even some of the huge chunks of rock embedded in the gravel roads.