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Shimano Ultegra RD-6870-SS rear derailleur compatible with 11-28 cassette

3K views 3 replies 3 participants last post by  enduro_phreak 
#1 ·
Can you use an 11-28 cassette with an 11-speed Shimano Ultegra RD-6870-SS rear derailleur (Di2)?

The Shimano website at product seems to suggest that when your largest cog is a 28, the smallest that a cog can be is 12 teeth. Or perhaps I'm reading it wrong.

The same question would apply, I suppose, to an 11-speed Shimano Ultegra RD-6800-SS rear derailleur (mechanical).

FWIW, the setup I'm proposing to use is a 50-34 with an 11-28 cassette, which would not exceed the total capacity that Shimano specifies for this derailleur.

Thanks in advance!
 
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