So you ask, do you need fenders Pgh to DC?
And I ask, Travelling alone or in a group?
Alone, no fenders needed, except for comfort if it's wet.
In a group, YES fenders needed, especially if you're riding somewhat close in a conversational group. The surface from Pgh to Cumberland is quite fine and gets tossed about a bit.
And, to go further: the front fender is for your own comfort (your rack will contain most of the rear splash) and the rear fender is for your buddy's comfort. Seeing a guy with a front fender and no back fender - - it's almost a shame.
Here's our 2006 trip report
, we're going again June 22 I think, hoping to take advantage of the longest days.