Rear derailleur compatibility, does # of speeds matter?
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  1. #1
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    Question Rear derailleur compatibility, does # of speeds matter?

    I was just wondering. If I have say 10 speed indexed shifters, must I have a 10 speed rear derailleur?

    Does the shifer regualate the amount of cable available to move the derailleur up and down the cogs? Does the derailleur handle any of the indexing or does it just "follow orders" from the shifter? I don't even know if a derailleur has to travel farther on a 10 speed than it does a 9 speed with similar #'s of teeth...I just guessed that they've been spacing the cogs closer together.

    Just wondering, thanks.
    Tshirt

  2. #2
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    Deraillers just follow the shifters commands. The shifter determines how far the derailler moves. It doesn't matter is the derailler is 8 or 9 or 10, it will shift however far the derailler lets it.
    Mike

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  3. #3
    NeoRetroGrouch
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    Quote Originally Posted by MikeBiker
    Deraillers just follow the shifters commands. The shifter determines how far the derailler moves. It doesn't matter is the derailler is 8 or 9 or 10, it will shift however far the derailler lets it.
    Some do use different pulleys on the RD. I believe there is are different pulleys between Shimano 8 & 9 and between Campy 9 & 10. - TF
    "Don't those guys know they're old?!!"
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  4. #4
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    MikeBiker,

    That makes sense. Thank you very much for your help.

    Tshirt

  5. #5
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    TurboTurtle,

    I didn't know that some had different pulleys; I wonder if that affects the performance. That's good to know. Thank you.

    Thanks
    Tshirt

  6. #6
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    Quote Originally Posted by TurboTurtle
    Some do use different pulleys on the RD. I believe there is are different pulleys between Shimano 8 & 9 and between Campy 9 & 10. - TF
    I've used 9 speed with 8 speed derailleurs in the past and they work perfectly. Same with 10 speed drivetrain and 9 speed derailleurs. The derailleur moves within the spacing. The shifter determines the amount of cable pull. (For Shimano)

    Shimano pulleys are very slightly different...not enough to really make a difference. Campy pulleys are different and mixing and matching 9 and 10 speed produces varied result.

    If you ride Shimano-don't buy a derailleur if yours still works.
    If Campy- spend the $$
    Pretty much here just to piss you off...

  7. #7
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    merckx56,

    Very good, thank you. It's good to know that other people have experience with this. My BB is Campy...and the bike is a single speed, so I guess spending dough was unavoidable.
    ;) I'll look for a 10 speed. Thanks for your advice.

    Have a great weekend,
    Tshirt

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