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  • Can I use an 11spd Shimano 105 R7000 Rear Derailleur with 10spd shifters and cassette

    No

    But maybe a 9spd MTB RD would work with 10spd road shifters?

    It will.

    Would the newer style "shadow cage" 9-spd RDs work?

    Yes.

    Is it only road RD that 10 and 11 spd shift-activation ratio differs?

    Yes, 10 and 11 speed MTB shifters have the same cable pull per click. That's why 11 speed MTB rear derailleurs are sold as 10/11 speed.

  • Zinn wrote "The derailleur’s shift-activation ratio is different for Shimano 11-speed rear derailleurs than it is for Shimano 10-speed rear derailleurs."

    Maybe that's just for road then.

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