I am currently converting my wife's Burley McKenzie from 105 9 speed double crank to Ultegra 10 speed triple (to make it easier to go uphill during pregnancy). I am facing two issues:
1) What front derailleur to install for the Ultegra 6603 which is 52/39/30? I am trying to choose between a 7703 (Dura Ace 9 speed model) and the 105/Ultegra 10speed models. From Sheldon Brown we know that all of these are 'optimized' for 13 teeth between largest and middle chainring. Since the rest of the Burley set up is 9 speed (including the chain) I am leaning towards the DA 9 speed FD, as presumably that is more compatible with the slightly wider 9 speed chain. Or should I got with a 10 speed 105/Ultegra FD (which costs about the same as 9 speed DA)? Any suggestions or experiences you can share?
2) The 6603 crank is currenlty missing the little spacer that goes between the BB and the non-drive crankarm (spacer is for 6603 crank only, not for the 6600). Do I really need that, or can I install it without (for a short while/forever)?