I built my own bike up from scratch. I have a compact DuraAce 7900 CRank running a 11/23 Ultegra 6700 cassette with a Dura Ace Chain. Dura Ace 7900 FD and RD. DA 7900 shifters.
I can set the RD indexing perfectly when in the large chainring, however when I shift to the small chainring, it's off and I have to tighten the cable tension on the RD barrell adj. Can't seem to find a compromise position that works bewteen both.
Rear D hanger was adjusted using the Park Tool.
I set the chain length per the Zinn method (derailleur cage position.) When I tried to establish chain length per the Park Blue Book method, it was one link shorter.
Would shortening the chain have any effect? Any ideas
As a note - this particular bike does not have a cable tension adj on the downtube like my previous bikes. The cable goes inside the downtube through an internal housing. There's only a cable stop where normally a barrel adjuster would be.