We are thinking of doing the Loop in late September/early October and some in the group have concerns over traffic/lack of shoulders and steepness of grades. Is traffic less of an issue at the time of year we are planning? Also, any information on the surface conditions of the route? From the maps, it looks mostly on-road except for the Greenbriar River trail. Some of us are planning on touring bikes others on 29s with thiner tires. Any info would be greatly appreciated.