Quote Originally Posted by Muirenn View Post
I have a CAADX (Cannondale), and I have to say, the aluminum frameset is supurb. Not all aluminum is equal, just like not all steel and carbon are equal. I just checked the geometry, and it looks like they have smaller sizes than in the past. I would upgrade to a carbon stem, but I'd do that for any bike that has a carbon fork, (which this does).

The head tube is high and relaxed, which makes the reach quite short. The smallest has an effective top tube of 51.5. And, there is a carbon version available,, but it has a lower head tube so is more agressive. I don't personally think carbon is necessary for the type of riding you'll be doing. The aluminum frameset 'sings' a bit. Like steel and is very comfortable. But feels lighter. I have actually riden this bike in the surf at the ocean, then cleaned it immediately with no ill effects. Zero rust problems on the frameset, fittings and screws when it gets wet. Worth looking into. (I also have an old 853 quality steel Le Monde, and a carbon Pinarello. I am not less comfortable on the aluminum frameset, though the cx tires may make it more cush, no idea).
One thing to consider, though, is frame size. Smaller aluminum frames can have a harsher ride than the same bike in a larger size. However, OP, if you the smallest size would fit you, try it. Cannondale's aluminum is excellent. (I've ridden a CAAD10, with skinny road tires, and found it to be almost as comfortable as carbon.) However, it does depend on your road surfaces. This ride was on relatively smooth asphalt. Chipseal might be another matter entirely.