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@Ndeipi
I mentioned before that I saved 100g by switching from Chorus brakes to the Planet X CNC brakes. I have carried the same weight weenie thinking into every component. Marginal gains only add up if you have plenty of them..
WHEELS: I've cobbled together a ~1400g carbon wheelset.
CASSETTE: I found a Record 10s cassette on eBay which has 9 of 10 sprockets machined from titanium. But it's 12-23 so a bit demanding! Still, it saves 100g over my heavier 13-26 steel cassette (Veloce or Centaur maybe).
PEDALS: - The pedals are Wellgo MG-8 magnesium SPD pedals, bought off someone on here for a bargain. They save 100g over a normal set of SPDs. I could go hyper-modern with carbon Look pedals or something but I just like SPDs, and I like my SPD shoes.
SEATPOST: Good old USE Alien carbon, only 150g, at least 100g less than an alu post.
STEM: The Grammo stem (Ti) saves 40 / 100g against a steel tube / forged alu stem.
SADDLE: I've found a carbon version of my preferred Romin saddle, saving 50g.
SKEWERS: I've settled on the lightest skewers that will work, a KCNC Ti front and a Ultegra rear (the KCNC rear skewer slipped on the chrome dropouts). Just that front skewer alone is saving around 30-40g.
TYRES: I have chosen 23mm tyres over 25mm because they save 50g/pr.
Even smaller savings were found by carefully selecting bottle cages (and bolts!), cables, rim tape, etc.
So all up, the bike in this configuration is 7.95kg. Mission complete.