Matt from Altoona PA on 6/23/2013 7:46:45 PM:
Hey there,
I rode the GAP last year fall and it rained the entire first day, poured actually. Day 2 dry. I rode my single speed mountain bike with a pair of slicks. I did not have a single traction issue. The GAP drains very well, very few puddles to navigate. Planning a 3 day GAP & C and O, but been derailed twice, once by weather and then by a bad back. Good luck and make it happen,,,,