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  1. #1
    the catalan connection
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    Can someone please explain me this chainring?

    I just donīt get it.
    Itīs a Middleburn outer 40T chainring, nice, I was wanting this.
    But have a look at the pics. Why is the pocket por the bolt head on the inner side of the ring?Supposing is going to be unused, am I gonna get a large enough bolt to catch all that thickness? The other one shows you that is really a outer ring becouse it has a pin for anti-chaindrop.(just in case you dunno)
    Is there something wrong????
    Thanks guys!,
    Attached Thumbnails Attached Thumbnails Can someone please explain me this chainring?-imag0115.jpg  

    Can someone please explain me this chainring?-imag0116.jpg  

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  2. #2
    Nouveau Retrogrouch SuperModerator
    Reputation: shiggy's Avatar
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    Quote Originally Posted by What&son View Post
    I just donīt get it.
    Itīs a Middleburn outer 40T chainring, nice, I was wanting this.
    But have a look at the pics. Why is the pocket por the bolt head on the inner side of the ring?Supposing is going to be unused, am I gonna get a large enough bolt to catch all that thickness? The other one shows you that is really a outer ring becouse it has a pin for anti-chaindrop.(just in case you dunno)
    Is there something wrong????
    Thanks guys!,
    If that is a 40t ring, it is for a road crank.

    Or maybe a SRAM 2x crank with a 120BCD. The outer ring mounts inside the spider arms.
    Last edited by shiggy; 07-01-2011 at 03:28 PM.
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  3. #3
    Feral Roadie
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    Yes, something is wrong. It took me a while to figure out what you're taking about. The recess for the chainring bolt should be on the other side, unless that is a chainring for
    certain cranks that have separate bolts for just the outer ring.

    Some MTB double cranks have that setup and for a while I think certain model year XTR cranks had 3 different bolts.

    I've got a Middleburn 42 as my outer chainring and it's definitely has a recess on the other side.

    - Booker C. Bense
    Last edited by bbense; 07-01-2011 at 03:38 PM.

  4. #4
    the catalan connection
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    Oh no! A 40T outer 104bcd? It was too good to be true...I just wonder now if Middleburn has a "normal" facing pocket version? Dunno that, otherwise would have been specd. somewhere, wouldnīt it?
    I can give it a try and see if fits somehow....otherwise will have to go back, hopefully shop (online) accepts the return.
    Thanks guys!
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  5. #5
    Trail Tire TV on blogger
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    it's for the older 960 XTR cranks... they use 3 tier bolt pattern instead on the 2 most have... or for the 2x10 setup, both bolt from the inside if I remember correctly

    Last edited by thomllama; 07-02-2011 at 09:20 AM.
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  6. #6
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    Is this ring a 104mm bcd?

    If it is 102, then it is meant for the old style XTR.

    If it has 104 then it is an 'outer' for 2x9/2x10 setups where the 'outer' is usually where middle ring is in a triple setup.

    YOu can use it as an outer in a triple, you just need slightly longer screws

  7. #7
    the catalan connection
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    Thomllama:Yea, or something like, as shiggy said, that has the spider outside the outer ring.
    Dunno is for the 960 though. Different BCD.
    Last edited by What&son; 07-02-2011 at 11:05 AM.
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  8. #8
    the catalan connection
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    Quote Originally Posted by uzurpator View Post
    YOu can use it as an outer in a triple, you just need slightly longer screws
    Iīm kind of trying this.
    I donīt like the recess on the inner side though. Chisel force over the nut changes...If there is any left at all. Iīll have to mount the nuts from the outside and the bolts from the inside.This way it works keeping the same bolt and nut length. And then fill the gap the recess leaves inside to get get back the original chisel force the nuts are designed for. Does it sound ok?
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  9. #9
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by What&son View Post
    Iīm kind of trying this.
    I donīt like the recess on the inner side though. Chisel force over the nut changes...If there is any left at all. Iīll have to mount the nuts from the outside and the bolts from the inside.This way it works keeping the same bolt and nut length. And then fill the gap the recess leaves inside to get get back the original chisel force the nuts are designed for. Does it sound ok?
    The recess does not really matter in this case, but does the BCD match your crank (whatever that is)?
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  10. #10
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by thomllama View Post
    it's for the older 960 XTR cranks... they use 3 tier bolt pattern instead on the 2 most have... or for the 2x10 setup, both bolt from the inside if I remember correctly

    Forgot about that silly crankset.
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  11. #11
    the catalan connection
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    Quote Originally Posted by shiggy View Post
    The recess does not really matter in this case, but does the BCD match your crank (whatever that is)?
    Sure, and the spider is actually the same Manufacturer by the way.
    Attached Thumbnails Attached Thumbnails Can someone please explain me this chainring?-crankset.jpg  

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  12. #12
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by What&son View Post
    Sure, and the spider is actually the same Manufacturer by the way.
    I still do not see that the BCDs match. The 40t looks larger than 104mm.

    And Middleburn offers a bunch of different BCD spiders.
    Last edited by shiggy; 07-02-2011 at 04:23 PM.
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  13. #13
    the catalan connection
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    Quote Originally Posted by shiggy View Post
    I still do not see that the BCDs match. The 40t looks larger than 104mm.

    And Middleburn offers a bunch of different BCD spiders.
    Itīs a Middleburn xtr spider to turn older 950 series cranks into 64-104 bcd.On the crankset pic the outer ring is a xt 760, middle a TA 32, inner a steel maybe Deore. The Middleburn ring is 104, believe me, Iīve just put it on
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