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  1. #1
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    Middleburn crankset

    Thinking about going 2x9 with a 44 and 32, 30, etc chain ring combo. It looks like a Middleburn is a decent option, and can be purchased for under $300.

    The only concern here is the bottom brackets required are either an Isis or square taper. Are these good options compared to a bb30 FSA Afterbuner? Is bb30 or bottom bracket selection more important than gear options and weight on a crankset?

  2. #2
    Former Bike Wrench
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    Middleburn has X-Type crankarms which most closely compare to BB30.

    http://www.chainreactioncycles.com/M...?ModelID=55466

    BB30 requires a frame that has a BB30 Bottom bracket shell, which most frames currently don't have.

  3. #3
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    A bit off topic but...

    Why do the X type RS8's not look as lean and machined as the ISIS & Square RS8 and RS7 Cranks? I was happy that they finally came around but they are a bit blah compared to my current ISIS RS7's

    The first two are the ISIS / Square the second two are X type-
    Attached Thumbnails Attached Thumbnails Middleburn crankset-rs7-isis.jpg  

    Middleburn crankset-middleburn-rs8-isis.jpg  

    Middleburn crankset-middleburn_rs8_xtype.jpg  

    Middleburn crankset-x-type-mb.jpg  

    I Just wish I could ride more!


  4. #4
    Tá mé ar meisce.
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    I agree the older style looks better. I kind of like the more "square" look.

    Does anyone know if they plan on making the x-type in 180mm?
    To see what is right, and not to do it, is want of courage or of principle. -- Confucius
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    Come join me at the Swamp

  5. #5
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    Middleburn & bb30

    Thanks for the information. Say, I have one more question.

    My frame is bb30 compatible, but I have a GXP bottom bracket installed with an adaptor to fit a bb30 frame. Using the cranks shown in CRC link, would I need a new bottom bracket like a bb30?

    Take care

  6. #6
    Rider and Wrench
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    Quote Originally Posted by 26hardtail
    Thanks for the information. Say, I have one more question.

    My frame is bb30 compatible, but I have a GXP bottom bracket installed with an adaptor to fit a bb30 frame. Using the cranks shown in CRC link, would I need a new bottom bracket like a bb30?

    Take care

    This is directly from the link you referenced-
    "The X-Type version uses a floating 24mm alloy BB axle"

    You would not need any adapter it would fit right into the GXP BB you have- as sram/truvativ uses the 24mm format-
    I Just wish I could ride more!


  7. #7
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    Thank you

    Thanks for the input. I appreciate the help.

  8. #8
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    Quote Originally Posted by knottshore
    This is directly from the link you referenced-
    "The X-Type version uses a floating 24mm alloy BB axle"

    You would not need any adapter it would fit right into the GXP BB you have- as sram/truvativ uses the 24mm format-
    NO

    It is not compatible with the SRAM GXP system, it is compatible with the Shimano (or equivalent) system. They are not cross compatible. SRAM uses a stepped axle that is actually 22mm on the non-drive side.

    http://www.middleburn.co.uk/x-type-f...structions.pdf

  9. #9
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    Quote Originally Posted by mtnbiker72
    NO

    It is not compatible with the SRAM GXP system, it is compatible with the Shimano (or equivalent) system. They are not cross compatible. SRAM uses a stepped axle that is actually 22mm on the non-drive side.

    http://www.middleburn.co.uk/x-type-f...structions.pdf
    My bad- I was thinking Race Face X-type not GXP -thanks for the correction mtnbiker72

    The adapter for installing it in the bb30 should still work but you will need a Shimano compatible bb - Race Face, FSA, Etc...
    I Just wish I could ride more!


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