Originally Posted by
WizardOfBoz
So this is a different story than I've heard. Are you saying you can't replace a DA spider with the same spider from an Ultegra? I thought DA/Ultegra and 105 all fit the same freehub, no?
You can replace the whole cassette.
But, generally not individual sprockets for the large sprockets (see note below).
Dura Ace CS-9000 & CS-9100
12-28: 12,13,14,15,16,17 (19-21-23) (25-28)
Ultegra CS-6800
11-28: 11,12,13,14,15,17 (19-21) (23-25-28)
12-25: 12,13,14,15,16,17 (18-19) (21-23-25)
I suppose there is an Ultegra 11-23:
11,12,13,14,15,16 (17-18) (19-21-23)
Anyway, the Dura Ace does a bunch of individual sprockets followed by a group of 3 and then a group of 2.
The Ultegra does a bunch of individual sprockets followed by a group of 2, then a group of 3.
So, I guess the 11-23 sprocket set from the Ultegra might fit on your Dura Ace cassette, but it may not shift perfectly. Hopfeully sprocket spacing would be ok.
So, here is the Ultegra 19-23... if you wanted to try it.
Shimano Ultegra CS-6800 19-21-23T Cog Unit for 11-23T 11 Speed Cassette | eBay