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  1. #1
    Senior Member Haku's Avatar
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    What rear Derailleur

    I have a 9 speep Giant with Ultegra long cage rear Derailleur with Dura Ace shifers. This is a compact double 50x36 chain rings, I want to put a short cage Dura Ace rear Derailleur on the bike. Which one would be compatable 6500 6600???

  2. #2
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    The 6500 was the 9-speed era rear derailleur. However, what do you hope to improve with the change?

  3. #3
    coprolite fietsbob's Avatar
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    The clicks are in the lever not the RD, just get a similar one as that works now in the shorter cage.

    My question: why bother?

    so ditto
    what do you hope to improve with the change?
    Aesthetics?

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    more importantly, what are you running for a casette? You sound knowledgeable so I assume you know what you are doing but obviously if you have a big casette on the back you will need the long cage. Otherwise, RD's are quite flexible, the whole 8spd/9spd/10/spd designation on deraileurs has never made any difference in my drivetrains.

  5. #5
    Extra Medium Member redtires's Avatar
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    Yes, any of the Shimano 9 speed derailleurs will work with you 9 speed shifters.
    Coming to you from and brought to you by:
    Department of redundancy department.

  6. #6
    Low car diet JiveTurkey's Avatar
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    All Shimano indexed rear derailleurs, except old Dura Ace (pre-8-speed) and new Dyna-Sys (MTB 10-speed), utilize the same cable-pull ratio, so it doesn't matter if it says 8-, 9-, or 10-speed.

    Any short cage (SS) Dura-Ace RD (9-speed and up) will work for you, assuming you're not exceeding the wrap capacity or max cog rating. The fact that there was a long-cage (GS) Ultegra, I'd check to make sure you won't exceed the wrap capacity of the RD.

    Chain wrap required (in Teeth) = [outer chainring + largest cog] - [inner chainring + smallest cog]

    You can look up the wrap capacity of the RD you want on Shimano's site. If your crank/cassette combo exceeds the SS RD's chain wrap capacity, go with the GS.
    Last edited by JiveTurkey; 03-24-11 at 07:15 PM.
    Quote Originally Posted by slopvehicle View Post
    Not wearing a helmet makes me more aware of my surroundings. I find myself anticipating the hardness of concrete 50 or 100 feet in front of me, it's almost a zen-like connection between my face and the pavement.

  7. #7
    Constant tinkerer FastJake's Avatar
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    Your cassette might be too much for a short cage to handle. What cassette do you have? Which leads into:

    Quote Originally Posted by HillRider View Post
    what do you hope to improve with the change?
    Why "derailer" is the correct way to spell the gear-change mechanism: sheldonbrown.com/derailer.html

  8. #8
    Senior Member Haku's Avatar
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    Cassette size

    My cassette is a 12-25 or 12-26.

  9. #9
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    Quote Originally Posted by JiveTurkey View Post
    All Shimano indexed rear derailleurs, except old Dura Ace (pre-8-speed) and new Dyna-Sys (MTB 10-speed), utilize the same cable-pull ratio, so it doesn't matter if it says 8-, 9-, or 10-speed.

    Any short cage (SS) Dura-Ace RD (8-speed and up) will work for you, assuming you're not exceeding the wrap capacity or max cog rating. The fact that there was a long-cage (GS) Ultegra, I'd check to make sure you won't exceed the wrap capacity of the RD.
    Not quite. It's the pre 9-speed Dura-Ace rear derailleurs that are not compatible.

  10. #10
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    Both of those with work with 26T rear.

  11. #11
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    6500 and 6600 are Ultegra. 7700 is DuraAce 9 speed.

  12. #12
    Low car diet JiveTurkey's Avatar
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    Quote Originally Posted by Al1943 View Post
    Not quite. It's the pre 9-speed Dura-Ace rear derailleurs that are not compatible.
    Oops, thanks. I'll edit my post.
    Quote Originally Posted by slopvehicle View Post
    Not wearing a helmet makes me more aware of my surroundings. I find myself anticipating the hardness of concrete 50 or 100 feet in front of me, it's almost a zen-like connection between my face and the pavement.

  13. #13
    Senior Member Haku's Avatar
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    It is not worth the trouble I am going to part out the bicycle.

  14. #14
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    well yeah, you could put a ss RD on there but your gs ultegra should work perfectly fine.

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