This weekend I heard that the light version of the Ridley X-Night that Bart Wellens & Co. are riding weighs in at 6,8 kg
The new Colnago C-50 the raboguys ride should weigh about 7,5 kg.
I think below 7,5 kg would qualify as a weight weenie bike
PS this is my bike spec:
Frame: Ridley Crossbow
Fork: 4ZA Aluminium
Wheels: DT Hugi hubs with FIR SC200 tubular rims and TUFO competition tubulars
Handlebar: Cinelli 220
Stem: ITM THE 120 mm
Shifters: Campa Daytona 9v.
Crank + BB + Rear Der. : Campa Chorus
Cables: Gore Tex
Brakes: Tektro onyx 'tuned' to work properly ;o)
Pedals: Time Atac alu
Seatpost: some pretty light PRO post
Seat: San Marco Aspide
Also I used some alu bolts I had laying around here and there, don't remember exactly but this should be the chainringbolts and the seatbinder-bolt. (stemcap bolts didn't work in alu, the handlebars were to loose)
Depending on the wheels I use the bike weighs in at about 8,7 kg (weighed it again just to be sure ;o) Don't know how accurate this is as my accurate weight only weighs up to 5 kg and I didn't bother taking everything apart again.
As you see not really light weight but building this bike didn't really cost my much money as I used a lot of parts I had laying around and it still turned out pretty sweet I think ;o)