While I have a hard time envisioning any folder on a century ride, I have a Dahon Speed Pro TT that I think could make this possible. I have ridden it as far as 40 consecutive miles and found it to be just as comfortable and almost as fast as my Trek road bike. I should note that I am a petite woman (barely 5 feet tall), so that might have something to do with my own comfort factor on a small bike. However, the hub gear on this baby means that it can really fly. It folds down fairly small (not as small as other Dahons, but small enough so that you can bring it on the Metro during rush hour). Overall, the bike performs great, although like all folders it can be a tad more temperamental from a maintenance perspective.