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Riding towards Delmarva.
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http://www.rei.com/product/769354?vcat=REI_SSHP_CYCLING_TOC

Doesn't say how long the cage is.....in the photo it looks like a long cage.

So my question would be.....

....If I run this rear derailler on my cross build with 10 speed double, 50/39 crankarm and 12/27 cassette......and I "assume" this rear derailler is long cage, going from the photo...

....will it work ok? Chain capacity be ok? How about 12/25 with 50/39?.....
 

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Certainly looks like the 10-speed RD-5600-GS (long cage). It would work for you, but with the numbers you listed, so would a short-cage SS derailleur with its 29-tooth total capacity. GS total capacity is 37 teeth. Capacity needed for a setup is (LF - SF) + (LR - SR).
L- largest
S-smallest
 
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