Just a little update on this bike build now I've stopped messing with it and ridden it.
I decided to build a supersix after building a caad9 for winter work (it gets ridden a lot due to the amount of rain we seem to get!) the caad9 felt just so alive and fast compared to the carbon synapse I the. Had for a summer ride (using same r-SYS wheels). So I decided a switch to the carbon version of the caad9 rather than the synapse was the way to go.
Both bikes are great (synapse/ SS) but back to back the supersix is better handling and stiffer in the BB (the slk cranks came off the synapse too). It is a big complement to the caad9 that the SS feels the same, except the caad9 does crash over poor road surface (we have lots of that here) so much so it can kick you off line at high speed, the SS numbs this right off and hold the line better. You can relax more.
The build. I'm very happy with all my choices for build, and really thankful for advice given here. Best investments on this build;
Brakes. The zero gravity brakes were a big risk, a bit of thought in the setting up, and they are not quite as good as dura ace but they are more than good enough for me 77kg and are very very light!
Seatpost. The ritchey seatpost is very good value bought off eBay, saved a massive amount of weight and is very well made, very easy to adjust and is stiff.
Using dura ace SRAM force mix. This seems to work just fine, the rear mech/ chain/ cassette still makes quite a lot of noise just running along, not changing any gears, I'd like to know how to sort this as I can't help but feel that the rear mech/ chain length is wrong. Anyhow the shifting is really good, again not quite as good as shimano but very close and the weight saved for the cost was fantastic and well worth the change.
Kcnc. The kcnc QRs and seat clamp have been really good (could not hack it on my AM MTB and had to revert). Very well made, acceptable price, great weight.
Not so good:
The bb30 cranks creak, I've been given some advice about the metal and plastic spacers which I need try.
The super logic bar is not that siff, noticeably flexy under big load, so a little worried about that, very very light though!
Still dreaming about doing more to the bike to make it lighter, I'd need
Aliante braided carbon
SRAM red or DA cassette
Maybe tune the rear mech some how
Obviously getting an super six HM or super six evo frame would help! That ain't gonna happen
Might go for a ride on her now.......