Rivnuts from Munhall, PA on 3/14/2019 9:43:21 PM:
Unless there were a monsoon prior to or during your ride, you should have no problem riding a road bike from Pgh to Cumberland and back. I'd recommend 28mm or 32mm tires in lieu of 25mm or smaller. The GAP is generally smoother than some sections of the Panhandle especially the first 2 or 3 miles out of Walker's Mill where there is a fair amount of gravel. That said, the portion of the Panhandle in Washington County is virtually all paved which makes a road bike easy for that trail.