nickball

Hi there

Do Dura Ace do a 12-30 or 11-30 rear cassette.
If they don't is it possible to put an Ultegra one on?
The whole bike is set up with Dura Ace at the moment.
Doing the Struggle sportive in North Yorkshire, and could do with a larger cassette for it!

Thank you.

CliffordK

You didn't mention the number of sprockets.

For 11-speed, 105, Ultegra, and Dura Ace Cassettes are compatible.

For Dura Ace, Shimano makes an 11-28 and a 12-28.
For Ultegra, Shimano makes a 11-28, 11-32, & 12-25
105 only comes with those 3, and no tighter gearing options.

Search on Google for "CS-9000 PDF", "CS-6800 PDF",& CS-5800 PDF"

Other brands may carry the x-30 cassettes.

For 10-Speed cassettes, they are mostly compatible, with the exception of those wheels with aluminum freehubs which require deeper grooves in the cassettes.

andr0id

105 and Ultegra cassettes with the same number of cogs are compatible BUT you must stay within the capacity of the derailleur.

The current DA RD is rated for 28 teeth. You *might* be able to jam in 30. A better option is to get the long cage Ultegra RD and a new chain and set it up right.