What are the disadvantages to a carbon frame?

[zoom-zoom]

So since yesterday I've ridden two carbon bikes, different brands, and I think I've found a little problem. The top tubes on both were wider than on the similar aluminum models. My inner thighs kept rubbing against the frame. Admittedly. I don't have the thinnest thighs, but they're not huge, either and I couldn't ignore it. But they were both really nice rides.

I get this, sometimes...I have big thighs and relatively narrow hips (no thigh-gap for this girl -- I could be emaciated and my thighs would still touch. Even as a scrawny teenager my jeans always wore our first in the inner thigh area). Is it possible your knees are diving inwards too much while you pedal, too?

I will echo others who recommend carbon. I rode some godawful potholed roads on my Cannondale SuperSix and even was involved in a paceline crash when the rider in front of me had some debris tangle in her rear wheel and drivetrain and took us both down. My frame is still flawless and strong. SUPER smooth on our rough chipsealed roads here in MI, too.