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  1. #1
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    Can I use existing chainrings with Dura-Ace 9000 group?

    Hi,

    I'm building a Tarmac SL3 and would like to run the new 11 speed Dura-Ace group with an existing crankset. I have an S-Works compact crank and I haven't been able to find any info on whether old chainrings would work ok with the Dura-Ace 9000 drivetrain. Should the Specialized chainrings work? If not, are there rings I could put on it that would? I know the Dura-Ace crank would be much better, but it's not in the budget at the moment.

    Thanks!
    Last edited by SB-Rider; 09-14-12 at 12:01 AM. Reason: clarify

  2. #2
    certified vegetarian veggie's Avatar
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    You mean your existing crankset? As far as I know it will work just fine. The thing you will have to worry about is the spacing between the rings and the width of the chain, but I believe you should be fine on the spacing and I believe the new 11s chain is not any narrower.

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    11-speed chains are indeed slightly narrower than 10-speed but the difference isn't much and the spacing of 10-speed chainrings shouldn't cause problems.

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    certified vegetarian veggie's Avatar
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    Quote Originally Posted by HillRider View Post
    11-speed chains are indeed slightly narrower than 10-speed but the difference isn't much and the spacing of 10-speed chainrings shouldn't cause problems.
    Campy, yes, but actually the inner dimensions of the shimano 11 speed chain are the same as the current 10.

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    Senior Member himespau's Avatar
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    Quote Originally Posted by veggie View Post
    You mean your existing crankset? As far as I know it will work just fine.
    Thanks for clarifying, I was wondering if the question was going to be whether or not normal chainrings would work on the wacky DA 9000 crankset with 4 bolts.
    Punctuation is important. It's the difference between "I helped my uncle, Jack, off a horse" and "I helped my uncle Jack off a horse"


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    I heard the width of the 9000 chain stayed the same and that it has solid side plates. I thought I read somewhere that the chain pins were slightly closer together, but I can't swear to it. I was wondering about things like how the new chain would get along with the ramps on the Specialized chainrings and how well it would shift. I'd like to get the new Dura-Ace group but use an older crankset.

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    certified vegetarian veggie's Avatar
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    The inside width is the same, but the outer plates are thinner, making a thinner chain. And I thought I read somewhere about teams who are using 7900 arm cranks with the rest being 9000 series.

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    I saw that, there are pics of pro teams using 7900 cranks with power meters on bikes with the 9000 group. I guess that's an encouraging sign there's compatibility with previous chainrings.

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    I found the article that mentions the pins are closer together on the new chain, but it doesn't say by how much or if it will be a problem with older chain rings. "It's the same width as Shimano's 10-speed chains but has a slightly shorter pitch (the distance between the chain rivets)." http://www.bikeradar.com/road/news/a...ce-9000-34009/

  10. #10
    Clipless in Coeur d'Alene twocicle's Avatar
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    Quote Originally Posted by SB-Rider View Post
    I found the article that mentions the pins are closer together on the new chain, but it doesn't say by how much or if it will be a problem with older chain rings. "It's the same width as Shimano's 10-speed chains but has a slightly shorter pitch (the distance between the chain rivets)." http://www.bikeradar.com/road/news/a...ce-9000-34009/
    I think this is incorrect info, so updating this thread.

    Pitch (link length) never changed from the standard 1/2". It is only the width (sometimes said as "pin length") that was changed from the 10spd 5.88mm to 5.5mm for the 11spd chain. One of the easiest ways to tell the diffs between chains is to go look at a 3rd party vendor such as KMC's "chain choice" selector and compare the diffs there.

    As the pitch never changed, this is why people have been successful in mixing components between 10 & 11spd.

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