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Which Di2 Ultegra Rear Derailleur
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There are 2 Ultegra Di2 rear derailleurs. 6870 SS and 6870 GS. Can't find the difference between them. Anyone know. The GS weighs more and is more expensive than the SS but I can' t figure out why choose one over the other.
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Re: Which Di2 Ultegra Rear Derailleur [mattr] [ In reply to ]
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The cages are different lengths. The SS will handle up to a 28T gear. The GS will handle up to a 32T gear.
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Re: Which Di2 Ultegra Rear Derailleur [mattr] [ In reply to ]
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I've used the SS with a 30, if that's any help to you building off the other poster. With the right chain length it isn't a problem.
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Re: Which Di2 Ultegra Rear Derailleur [mattr] [ In reply to ]
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This might be helpful to you if you are wondering what works with what. I just happened to randomly see this a couple weeks ago and it encompasses the entirety of my knowledge on the subject ;-) it sounds like the other poster is right, there is not an exact cut off despite what Shimano says.

http://blog.artscyclery.com/...no-road-derailleurs/
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Re: Which Di2 Ultegra Rear Derailleur [STP] [ In reply to ]
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Thanks.
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