Unless they've changed, it's an aluminum frame with a steel fork. I had one, and liked it relatively well. However, I found the ride to be pretty harsh (at least for me). Since it's built for a load (and Cannondale has a reputation for being stiff anyway), it was *really* stiff. So much so that it wasn't comfortable *to me*. There's a lady here who does all sorts of club rides on her T2000 (same frame, better components). She loves it.

CA