m970 cranks and 36T chainring?- Mtbr.com
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  1. #1
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    m970 cranks and 36T chainring?

    So here's the deal. I"m going to be running the stock xtr 22 inner and want the 36T middle for my soon to be e.13 drs setup. Problem arises in that the m970 cranks apparently have an 88mm inner diameter and this causes problems with normal non shimano 104mm bcd 4 bolt rings fitting the crankset. Found this out when trying to buy a middleburn 36T, the seller told me they wouldn't fit because of this. On the older m960's they would be fine. So my question is where can I get a 36T that will fit this setup? Thanks.

    BTW, will be on my rfx build.

  2. #2
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    careful with more than a 12 t jump. it starts to kill shiftin performance.
    No, I'm NOT back!

  3. #3
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    Quote Originally Posted by cactuscorn
    careful with more than a 12 t jump. it starts to kill shiftin performance.
    The middleburns have these ramp pins which should minimize the problem versus a regular ring...at least in theory.

  4. #4
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    pretty much every ring not slated for 1 speed front use has ramps and pins. some have done it and liked it, i didnt. its sluggish at best.
    No, I'm NOT back!

  5. #5
    MK_
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    Shimano's got a new line out this year, called SLX. They have a dual ring specific setup going with 22/36T chainrings. Maybe one of those will fit your needs. They also have a dual ring specific front derailleur with shorter cage for better clearance of the chainstay. You set it up lower than a standard one, it apparently prevents dropped chains better and works specifically for a 22/36T setup.

    _MK

  6. #6
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    Quote Originally Posted by cactuscorn
    pretty much every ring not slated for 1 speed front use has ramps and pins. some have done it and liked it, i didnt. its sluggish at best.
    so are you rockin the 22/32 setup then?

  7. #7
    I think I need to Upgrade
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    Quote Originally Posted by cactuscorn
    careful with more than a 12 t jump. it starts to kill shiftin performance.
    I have been running a 22t-36t set up for a while and it shifts just fine (e-stalker)*squeez*

  8. #8
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    ... and if we just ... 970 cranks with 22/36 rings

    I've been running the 970 cranks with the XTR 22 T ring and an XT 36 T ring(from the XT 761 crankset,but available separately) for almost a year with no problems! Good luck! Thomas

  9. #9
    Nightriding rules SuperModerator
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    Quote Originally Posted by MK_
    Shimano's got a new line out this year, called SLX. They have a dual ring specific setup going with 22/36T chainrings. Maybe one of those will fit your needs. They also have a dual ring specific front derailleur with shorter cage for better clearance of the chainstay. You set it up lower than a standard one, it apparently prevents dropped chains better and works specifically for a 22/36T setup.

    _MK
    I recently got a set of those...works pretty well

    <a href="https://www.flickr.com/photos/cmadrigal/2758464486/" title="Shimano SLX cranks by cmadrigal, on Flickr"><img src="https://farm4.static.flickr.com/3296/2758464486_d90cd30125_b.jpg" width="1024" height="768" alt="Shimano SLX cranks" /></a>

    <a href="https://www.flickr.com/photos/cmadrigal/2736763078/" title="Shimano SLX cranks 665 by cmadrigal, on Flickr"><img src="https://farm4.static.flickr.com/3016/2736763078_3fe736330a_b.jpg" width="768" height="1024" alt="Shimano SLX cranks 665" /></a>

  10. #10
    Natl. Champ DH Poser/Hack
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    22/34 baby! replaced those poopy xt rings with rf's. lovin the range and the performance. tossed the 22/32/44 xt's at the stinger and immediately bent the middle ring under my massive climbing power. im all man!
    No, I'm NOT back!

  11. #11
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    Quote Originally Posted by thjrollins
    I've been running the 970 cranks with the XTR 22 T ring and an XT 36 T ring(from the XT 761 crankset,but available separately) for almost a year with no problems! Good luck! Thomas
    Yes, that's what I wanted to hear. Thanks !!
    3po armorless, the first weight weenie.

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