how "light" could one of these things get built up? the SB one says 37 pounds, and that's with discs and cassettes+ shifters. what if you went singlespeed or fixed, canti brakes, and maybe some other ridiculous stuff?
here's the SB one:
edit:
18" = 5.66 lb (2.57 kg)
Fork - uncut = 2.52 lb (1.14 kg) uncut