Replacing RD9070 derailleur with RD 8050
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  1. #1
    RoadBikeReview Member
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    Replacing RD9070 derailleur with RD 8050

    I am replacing an RD 9070 with a RD 8050 in order to run a larger cassette. The RD 8050 has an extra link where it mounts that the RD 9070 did not have. Do I use this?

  2. #2
    Adorable Furry Hombre
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    See the Shimano's Dealer Manual for RD8050: https://si.shimano.com/pdfs/dm/DM-R8050-01-ENG.pdf

    The TL;DR version is:

    A) You have a conventional RD hganger--yes you use the B-link. Pay special attention to the angle of the b-link when mounted...otherwise your chain will not tension properly.**

    B) You have a Shimano Direct Mount frameset (such a certain BMC bikes, or Paragon Machineworks sliders etc)--then you remove the B-link.


    **Hello Mr. Asterisk My Old Friend. You're here to not provide all the answers and encourage manual reading.
    "Refreshingly Unconcerned With The Vulgar Exigencies Of Veracity "

  3. #3
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    Thanks. So my Domane has a hanger so I will leave link on.

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