Finally got the bike back together after creak tracking. Decided to do a few bits and then test tomorrow before further investigation if not resolved. Can trace it to what the cause was then, but my rear mech hanger was worrying loose so hopefully that was it.
Anyway, back on topic, the weights of the wheels?
Not the most ideal scales, as cheap bathroom set, but weighed both wheels, tyres, cassettes and quick releases together.
Standard Defy 1 set weighed 3.4kg's. The Zonda's with GP4000S and 105 cassette...2.6kg's. That's 800g difference!
Would prefer using a more sensitive scales, but shows quite a difference in fairness. Conti Race28 tubes in there too, so could drop another 120g if I had used the ultra lite latex tubes.