I did most of my commute today, but on my carbon road bike instead of my MTB just to see what it feels like. I'm usually the slowest guy on the Manhattan Bridge on the way up, but on my roadie I just blew by everybody and I'm still out of shape. I could see though that riding a road bike to work, even a less fancy one than I have, would be more risky. The tires wouldn't last, rims would start to wobble, flats...