Thanks for the link: I wish I could get that kind of riding in. But I've got a 4 month old & can only do a couple hours on weekend mornings (if the car doesn't need fixing, or errands don't need to be done). And 45 mins after work. The best I'm gonna do is 40 mi or so. But this goes to the first question in my post: If I can do 30 mi in (locally) bumpy/hilly Central Park with no problems, am I in decent enough shape to do a flat 65 / 100 mi in Montauk? (Aside from a little bit of butt pain.)