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Thread: carbon question

  1. #1
    mtbr member
    Join Date
    May 2008

    carbon question

    Does anyone know why carbon cranks still use alloy spindles?

  2. #2
    mtbr member
    Join Date
    Jul 2007
    most likely because of the NDS crank arm interface. Lots of torque on that clamp area. just a thought.

  3. #3
    Join Date
    Oct 2004
    Because the resin used in carbon will never exceed the hardness of alloy and as mnigro said, the torque will damage the resin and thus the carbon structure. Carbon structure is amazing in tension, but crap in compression/crush so no applications such as spindle w/ crushing or torque forces.
    The thing w/ handle bar...if you limit your crushing force (the bolt torque spec) and make the carbon thick enough, there's no real torque involved and so still works.

    Edit: I'm sure Mr. Magura will chime in on this shortly.

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