Is my Dura Ace deurailleur 10 speed or 9??
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  1. #1

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    Is my Dura Ace deurailleur 10 speed or 9??

    I just bought a used bike and it has mixed parts. The rear deurailleur is dura ace and the inside plate where the chain goes through is black. Does this help? Want to know if it is 10 or 9 speed. Thanks

  2. #2
    Old and Fixed, Moderator
    Reputation: Dave Hickey's Avatar
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    Quote Originally Posted by Shane
    I just bought a used bike and it has mixed parts. The rear deurailleur is dura ace and the inside plate where the chain goes through is black. Does this help? Want to know if it is 10 or 9 speed. Thanks
    If the inside plate is black and the barrel adjuster is black, It's a 10 speed.
    Dave Hickey/ Fort Worth

    My 3Rensho Blog: http://vintage3rensholove.blogspot.com/

  3. #3

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    I dont understand why there should be a difference between a 9s and 10s speed deraillour. The total width of a 9s and 10s cassette is the same. the spacing between the cogs (indexing) is different between a 9s and 10s cassette isdifferent, but this spacing is determind by the shifters...
    Hummm.. Is there something I'm missing? maybe the pulleys on the derailour?

  4. #4

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    Rd 9/10

    Quote Originally Posted by sorebut
    I dont understand why there should be a difference between a 9s and 10s speed deraillour. The total width of a 9s and 10s cassette is the same. the spacing between the cogs (indexing) is different between a 9s and 10s cassette isdifferent, but this spacing is determind by the shifters...
    Hummm.. Is there something I'm missing? maybe the pulleys on the derailour?
    Functionally there isn't a difference.Shimano upgraded the design for 10 and charges alot more.

  5. #5

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    Quote Originally Posted by Rusty Coggs
    Functionally there isn't a difference.Shimano upgraded the design for 10 and charges alot more.
    Yes, 9s is only one digit, and 10s is two digitts.. they should charge double..

  6. #6
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    Quote Originally Posted by Shane
    ... if it is 10 or 9 speed?
    Yes.

    It can even do 8 speed.

    The RD just needs the capacity to align under the smallest and the largets cogs.

    It is really the shifter that makes the difference.

    There may be some changes with the pulleys for the narrower chain, but that will just make a slight difference in how smooth shifting is (you may not notice).

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