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  1. #1
    Senior Member Jakedatc's Avatar
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    Chain rings for shimano deore triple

    On my winter/rain bike i have a deore touring triple.. 50-44-28. I would really like to put a 36t middle ring to make the shifts more spaced out and be more useful. I cannot find the bolt spacing stamped anywhere. it is a 5 bolt pattern though. 7 speed rear if that matters.

    any help on where to find a new ring would be great.


    Last edited by Jakedatc; 01-18-10 at 10:06 AM.
    2007 CSK
    199? Trek 1420 ** 15% Off Hammer Nutrition Referral Code **

  2. #2
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    ever heard of a ruler?? prob 110 bcd or 94

  3. #3
    Senior Member Jakedatc's Avatar
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    Oops. checked Sheldon's site. 110 bcd sorry.. mostly looking for where to get a ring that will fit. I don't have an LBS near me that carries parts so i need to order the correct one online
    2007 CSK
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  4. #4
    Senior Member Jakedatc's Avatar
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    http://www.treefortbikes.com/324_333...Chainring.html this is what i'm leaning towards..
    2007 CSK
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  5. #5
    Senior Member Jakedatc's Avatar
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    Does it matter if it's 9-10 speed or meant for a double compact as long as it is 110 bcd?
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  6. #6
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by Jakedatc View Post
    Does it matter if it's 9-10 speed or meant for a double compact as long as it is 110 bcd?
    No. 110mm BCD is 110mm BCD. (Except for Campy compact.) 9/10 speed rings may be configured to have a smaller gap between the adjoining rings, which may or may not affect you.

    However, if I understand your original post, you're looking at making a 28-36-50 triple. This may not work because the chain will want to shift from the granny to the big chainring without landing on the middle. This is because the front derailleur pushes the chain sideways, and with those chainrings it'll contact the big ring as well as the middle. You'll end up making a double shift: granny-to-big then big-to-middle when you want to just go to the middle ring. This is annoying and frustrating.

    Shimano sold those cranks in a couple different configurations originally: 26-36-46, 28-38-48, and 28-44-50, IIRC. If you want a smaller middle ring, you should seriously consider putting a smaller outer ring also.
    Jeff Wills

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  7. #7
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    Here is a ring that will work. http://www.rivbike.com/products/show/chainrings/12-012 What you have is the front side of half-step gearing.

  8. #8
    Senior Member Jakedatc's Avatar
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    aight.. we're going for it. I got a Vuelta 36T 110bcd no ramps or crap ring and i'm smart enough to get the Park chainring tool so i'm not stuck going why the hell won't these bolts come out! i'll try to remember to post up on how it goes
    2007 CSK
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