Joe, you're welcome.

There is the diameter to worry about as well. The other week I helped a friend go from 32 mm to 38 mm tires. The larger tires wouldn't fit into the dropouts at first, because the tread would jam against the chainstay bridge. Letting the air out helped, but in the end we had to make use of the sliding dropouts to make enough room to get the tire in place. Had it not been for the sliding dropouts, we would not have gotten the tire into the frame. Side-to-side clearance is fine, but the diameter of the larger tire was almost a show-stopper.