Hi guys. First post on this site. I need some advice. I am 63. In my late 40's I was an avid road rider, usually with a bunch of younger guys. One reason I sold the road bike and moved to a more upright mountain bike was because my lower back hurt after an hour or so. Turns out I have a herniated disc I now have a hybrid (Trek FX7.3), and my back is fine.....but I am tempted to buy another road bike because I am getting tired of being passed by roadies. Two questions. 1. Any advice regarding bike geometry? 2. I am looking at a new 2010 Opus Alto (carbon forks, seat stay & chain stay on an aluminum frame). Any comments? Thanks.