Fred is quite right, most of the UGRR is on roads - quiet back roads and/or roads with shoulders suitable for bicycling. We do follow the Little Miami Scenic Trail and the Western Reserve Greenway, both in Ohio. There are two more bike trails on the route in Ontario.
However, you seem interested in doing this route via your road bike and that would be the perfect bike for it. Our maps provide turn-by-turn instructions for staying on the right roads and also provide elevations, weather conditions and service information for camping or hotels. Let us know if we can answer any of your questions. Feel free to call our office at 800-755-2453.
New Routes Coordinator
Adventure Cycling Association