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Rear Derailleur

Old 05-12-10, 09:29 PM
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Rear Derailleur

How can I tell if my rear derailleur is a short or medium cage? Thanks
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Old 05-12-10, 09:37 PM
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Is there a brand and model number?

Compare the cage length to other bikes with known cage lengths.
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Old 05-12-10, 09:42 PM
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It is a shimano 105 5600
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Old 05-12-10, 09:46 PM
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Need a more descriptive part number. There is a short cage and a medium cage.

https://www.ebikestop.com/derailleur_...s%29%29502.php
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Old 05-12-10, 09:49 PM
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IIRC, if you have 2 chain rings, chances are you likely have a short cage RD, 3 chain rings would require a long cage.
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Old 05-12-10, 10:04 PM
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It's either a short cage, SS, or a long cage, GS. There are no Shimano medium cage road derailleurs. The SS is sold with double cranksets, the GS is sold with triple cranksets and may be used with double cranksets. Shimano does make some medium cage mountain derailleurs, but the 105 is a road RD. Take a look at the examples shown at https://www.shimano.com.
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Old 05-12-10, 10:23 PM
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Road SS (short cage):

vs.

Road GS (long cage):


Once you've seen the two compared, I imagine it will be pretty easy to figure out which any given one is.
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Old 05-12-10, 11:03 PM
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Or you can look at it like this, there are three cage lengths, SS, GS & SGS, i.e. short medium and long. If you're dealing with road group derailleurs then it's usually SS and GS, if mountain then it's generally GS vs SGS. Just relative to what your usual application is. Mountain bikers often call the GS short cage just as road bikers may call it long cage.
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