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Compare apples to apples! .. Assuming you get a 3D+ that's 468g advertised, then put some rings on it, 153g Rotor compact Non Q, and it weighs 621g vs 694g advertised for your current Ultegra. If you get a 3D, advertised as 540g, then you're saving 1g! Obviously, there's some difference in the bottom bracket weights ..
My ever continuing build..getting there now..(yeah right) I just want to upgrade the chain set (wheels manufacturing pf30 BB to shimano fit is rather heavy) thinking rotor? Trying out some challenge open crit tyres and just finished giving her a nice clean and service (y)