11 speed cassettes
I'm looking at a new bike with 11-speed gearing either 105 or Ultegra and ideally I would like a 12-28 cassette as the best combination of narrow gaps and a range to suit my normal riding speed. However in 105 and Ultegra the only options are 11-25, 12-25 & 11-28. Would it be possible to get a 12-25 then swap the last couple of cogs which are usually separate? Or is forking out for the Dura ace cassette the only solution?