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Mine is 6.3kg for a 54cm v the 56cm CAAD 12 Ultegra Disc 3 (8.34kg) or the non disc (7.5kg).
Personally, once you get below 9.5kg, it become harder to really pinpoint the difference (with same wheels, tyres and shift/brakes feel), the ride charactistic is what really stood out and that can give the illusion of weight losses/gain (like a CX bike with slow steering make it feel heavy to ride).
Depends how lean you are and what you're using it for I guess. I don't think I could loose much more weight but if I'm racing on a hilly course I'd defo want my SS HM over my Canyon Ultimate AL SLX. Reckon there's about 1 kg between them and both are kitted out fairly well. SS is stiffer but without doubt there is a certain placebo effect too.
My CAAD 10 ownership lasted all of 5 mins riding (before it was written off) so can't really comment on the CAAD 12's predecessor but the Supersix climbs beautifully. Mine is 6.3kg for a 54cm v the 56cm CAAD 12 Ultegra Disc 3 (8.34kg) or the non disc (7.5kg).
Looking at that you'd really notice a 2kg difference! (couldn't be arsed to search for 54cm weights).