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Gear Question

I have the Di2 Dura -Ace set up on my...

I have the Di2 Dura -Ace set up on my Cervello using the FD-7970 front derailleur. I wanted to change my rear cassette to a 12-27. Do I need to change the derailleur or will it work without any adjustmants just changing the rear sprocket? Thanks

Best Answer Responded on

Just found out that it was the rear derailleur RD-7970 that is the factor and apparently it will work with the 12-27...So thanks anyhow.