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Can I put an Ultegra 6800 (11 speed) on a bike running 10 speed 6700?

Reason; can't find a long cage 6700 in black. Want to run a 12-32 rear cassette and need the long cage. Yes I could put a silver rear derailleur on but it will not look as nice as all the other components are black and it's my wife's bike and has to look perfect all the time.
 

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And to answer your question, no, you cannot run a Shimano 11 speed rear derailleur with a 10 speed setup. The pull ratio is different for Shimano 11 speed derailleurs.

The dark color for 6700 is called "Grey" (It's more like gun metal). What I would call grey, Shimano calls "Silver".
 
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