derailleur/chain/cassette compatibility

Paddyone
Paddyone Posts: 3
edited May 2015 in Road buying advice
Hi,

Im looking to change the cassette on my training bike so i can get up hills a bit easier on longer rides. It is a 9 speed setup and I would like to change the cassette from an 11-28 to an 11-32.

This means i need to change the rear derailleur from short to medium.

The only 105 or ultegra rear derailleurs i can find that are 9 speed compatible are newer 10 speed derailleurs which state they are 8,9,10 speed compatible. if i buy one will it need a 9 speed chain to match the cassette or 10 speed chain to fit the new rear derailleur?

Thanks

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