Thought i would update. Bike weighed 8.8 or 8.9kg initially. It now weighs bang on 8kg, i need to weigh it again as i have removed another 100 grammes from previous brake levers. Ive done a fair bit to it and will be rebuilding the rear wheel soon. Rim is very worn - but in the mean time i did replace the bearing on rear hub axle, non drive side. Have also switched to 11 speed.
Changes :
Dura ace FD9000 11 speed front derailler
Ultegra r8000 11sp rear derailleur short cage
Xtr 11 speed shifter
New Ultegra 11 speed chain
105 11 speed cassette 11-28
Carbon fibre seat post
Bontrager saddle
Carbon fibre bottle holder
Tektro r720 lightweight brake levers
Dura ace front brake pads.
Bontrager silicone grips.
Titanium black bolts for bottle cages.
I have not reweighed it since the brake levers and titanium nuts were changed so expecting now to be at 7.9kg.
Next to do is an r8000 crank. May just order it from taiwan for £165 brand new. That will take another 100grammes off. Not rushing yet as still need to rebuild the rear wheel with a new clincher rim (ordered and despatched recently).
This new hobby is turning out to be not so cheap...!