Here is a pic of me warming up on my baby yesterday morning(pre race). With my disk on, and the 404 on the front, it is right around 20 lbs(estimated by using 20lb weight in other hand). The tech behind bike manufacturing is so much more complex then you would think. Take carbon fiber for example. The strench/weight/thickness required depends on the type of weave you use, how many layers, the type and amount of glue on each layer, the temperature it is baked at. Then you get into the shape of it. There is so much more to it then most think. If you look at most bikes now, the round tube is dead. They are all going for a weird box tupe, or an aero type(depending on what the manufacturers goal is)