I ride the perkiomen trail which is crushed limestone, cinder, dirt and paved. I do some riding on the Thun, which is the same and will connect down the road with the schuylkill river trail. The perk has one nice climb that isnt too long, but people who are out for a leisure ride usually get off their bike and walk after about riding 20% of the way. Havent ridden into philly yet, or gotten to know the wall. Should be interesting...and evil.