you really want to make sure your bars are high enough. I have heard that people have trouble holding their heads up at the end of the longer rides, and I'm a believer of that. I did 200k this weekend, and my neck got sore. I blame it on my glasses. I ended up taking them off, and things improved. But I'm raising my position.
I say go with whichever bike you are most confident in. I was going to ride my commuter/touring bike, but I'm not that confident in it because I have never done any distance on it. I ended up taking my racing bike. I still think that is the best decision, but next time I'll probably take the other bike for comfort reasons. I intend to take it on longer rides now.
Last edited by unterhausen; 02-10-09 at 01:58 AM.