I am considering upgrading my old Ultegra/DA 9 speed to 10 speed. Looking at component prices, SRAM Rival is about at my price point, but I have a few questions that I'm uncertain about after checking SRAM's specs and Sheldon's site. I plan to replace the crankset (50-34), bottom bracket, chain, cassette (11-23), shifters, and probably rear derailleur.
1. Can I use my existing DuraAce front/rear derailleurs with the Rival shifters? (SRAM says use their rear)
2. The compact Rival crankset shows a chainline of 44.5 mm vs. the 43.5 mm of my Ultegra double. Will this cause any problems with shifting or the front derailleur?
3. The GXP external bearing bottom bracket diameter matches for the English thread at 68 mm, but that is the only spec SRAM shows. Is there a concern with BB length or is this covered in the chainline question?
I've never used any SRAM equipment other than chains. They seem to get good marks around here, but are there concerns I haven't considered?