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  1. #1
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    Shimano Chain Compatibility (10 speed works with 9?)

    I'm looking to get the Shimano Dura Ace CN-7901 10-Speed Chain:

    http://www.amazon.com/Shimano-Dura-A...d=6GDX3RNOYD3Z

    It seems it would work on my bike which has a double crank and 9 speed rear cassette, but does anyone know for sure if it would?

  2. #2
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    Front shifting may not be all that great, depending on the cranks and rings you are running. 9-speed big and small centrelines are a little further apart than 10-speed. The chain won't drop into the gap between the rings, but it may tend to skate across the teeth of the small ring when you change from big to small instead of dropping neatly onto it.

    But it may not, either. Seems to vary depending on exactly what the cranks and rings are, and it may only happen in certain gears.

  3. #3
    Bikaholic blamp28's Avatar
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    Trek Fuel XC MTB, Giant OCR Road Bike, Rans Screamer - Tandem

  4. #4
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    Quote Originally Posted by scirocco View Post
    Front shifting may not be all that great, depending on the cranks and rings you are running. 9-speed big and small centrelines are a little further apart than 10-speed. The chain won't drop into the gap between the rings, but it may tend to skate across the teeth of the small ring when you change from big to small instead of dropping neatly onto it.

    But it may not, either. Seems to vary depending on exactly what the cranks and rings are, and it may only happen in certain gears.
    I'm running a 10-speed cassette and chain on a 9-speed Ultegra crank and the front shifting is very reliable and quick throughout the range. That said, maybe I'm lucky as I've heard of others having problems with this combination.

    Also, as noted, why buy the 10-speed chain when a 9-speed is cheaper?

  5. #5
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    I thought the XTR chains were for mountain bikes only?

    I saw that 9-speed DuraAce (7701) chain on Amazon as well, but I figured that the 7901 series chain would be better. I wasn't terribly concerned with the price difference because the chains will last me a long time.
    Last edited by dc16a2; 07-28-11 at 10:07 AM.

  6. #6
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    Quote Originally Posted by dc16a2 View Post
    I thought the XTR chains were for mountain bikes only?

    I saw that 9-speed DuraAce (7701) chain on Amazon as well, but I figured that the 7901 series chain would be better. I wasn't terribly concerned with the price difference because the chains will last me a long time.
    There is no such thing as a "mountain bike only" chain so the XTR chain will work fine on a road bike. The 7900-series chains are "directional" so be sure you read the installation sheet carefully before you install it.

  7. #7
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    Ah, well in that case, I will just get the Shimano CN-7701 Dura Ace XTR 9-speed that blamp28 suggested.

    I have the Park Tool CT-5C, which should be okay with this chain.

    Thanks everyone for helping me out.

  8. #8
    coprolite fietsbob's Avatar
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    You can get several KMC chains, for 1 DA priced one..
    better to not get attached to any chain,
    Preemptively replace them and the other stuff lasts longer..

  9. #9
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    The entire bike is Shimano so I'm trying to get it all to match.

    So I hear ya, but my OCD is quite loud on this one =)

    I am preemptively replacing the chain on this one though since its been 6 years.
    Last edited by dc16a2; 07-28-11 at 01:15 PM.

  10. #10
    Bikaholic blamp28's Avatar
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    If chain skips under power once replaced, you will need a cassette too. Best to replace when chain is 1/16" elongated over a 12" measurement from center to center on pins.
    Trek Fuel XC MTB, Giant OCR Road Bike, Rans Screamer - Tandem

  11. #11
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    I've had very good luck with 9-speed Dura-Ace/XTR chains on my 9-speed D-A drivetrain. I've never failed to get at least 5500 miles and up to 7000 miles on a D-A chain before it has elongated 1/16 inch per foot. The D-A chain is nickel stainless, more resistant to rust (I've never seen any rust), and it remains shiny even when dirty.

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