16-speed - the next generation

Just checking out your bike. Very cool. Now you got me thinking about my old TT frame that I didn't know what to do with. One thing puzzles me though, you've got an aluminun frame, carbon fork, carbon stem and bars, carbon cranks... it seems like the bike should be much lighter than 13kg (2.2 lbs /kg x 13kg = almost 29 lbs!). Is that accurate? I've never worked with disk brakes before. Are the rear hub and discs boosting your weight that much? If I did this with a road frame (caliper brakes) that might be a little ligher but the internal geared hub must be a monster. Awesome concept and very clean looking bike. This is one of the more interesting bikes on velospace and I'm envious of all those carbon components. Thanks for posting it.