Rear Derailleur Help

daveyruthers
daveyruthers Posts: 129
edited March 2014 in Road buying advice
Hi, I need a new rear derailleur but don't know if I need short or medium. My cassette is 12-25, not sure what chain set is but I'm sure it's a compact set up.

Any suggestions?


Thanks

David
Bianchi Via Nirone
Focus Izalco Pro 2.0

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