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about 5yrs ago, I changed out my Record 10 double to a Record Triple group [30/40/50 & 12x25]...I know the old front derailleur is for a double [53/39] but how do I tell if the OLD Rear derailleur is a short cage??? I can't find any markings ...

Pulleys measure 5.5cm Center-to-Center. I think this is a short cage derailleur but I want to make sure.....

Thanks to all in advance.
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