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MichaelC said:
If I want to switch my 11-23 Dura Ace 7800 cassette to 12-27, would I have to replace anything else in the drivetrain?
The cassette lock ring for the 11 cog is specific. If you buy a new Shimano 12-27 cassette it should come with a new lock ring. You won't need to replace anything else, but check the chain length to make sure it's long enough to handle the big ring to big cog combination just in case you accidentally cross chain. You don't want the rear derailleur to go all of the way to its forward limit when you shift to the 27.
~Al
 
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