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Replacement rear derailleur - short or medium

caedevcaedev Posts: 81
edited June 2014 in Road buying advice
I need to replace the rear derailleur on my Specialized Allez but don't know whether I need a short or long cage. Don't have the bike with me at the moment and need to order asap so it arrives before the weekend. Just looking for a striaght swap for the one shown in the link below.

Anyone able to help identify what I need?


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