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Thread: Broken XO Crank

  1. #26
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    I've seen 2 sets of these break locally (all the DH ones), and there is a pic in pinkbikes broken parts photos this month of another broken set. I think they should be fine for XC/Trail but using them for DH doesn't seem to be the best idea...

  2. #27
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    I was wondering about that too. There were a lot of downed trees across the trail that day and I think a trail crew was tagging downed trees that were to be cut. That's my story and I'm sticking with it.

  3. #28
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    in Leicestershire, United Kingdom - photo by Big-daves-remedy - Pinkbike

    Looks a little different but close enough. I think the biggest problem is that SRAM rates these as "Downhill" and they're not. They really need a XO level downhill/enduro/free-ride aluminum crank that can take multiple high impact hits and uses the same splined system for multiple or single ring set-ups.

  4. #29
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    Interesting.

    Good luck with your replacement cranks.

  5. #30
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    I too am a composites specialist and the first photo in this thread is very telling. Like Mr.Magura I like to figure out why a failure occurs.

    At the failure point there is de-lamination which indicates layup voids and or material contamination. With these items made in a fast pace work shop I can see shortcuts being made at several levels.

    On the second photo at entry #7, the pedal insert completely separated from the composite. Mr.Magura may be correct, galvanic reaction - the aluminum corrodes due to an electrical current between the aluminum and carbon. This breaks the bond between the two. I don't see any measures to insulate the carbon from the aluminum.

    The photo in #28 looks the same - complete insert separation.

    No aircraft quality work on this stuff!

    Wipp you are correct, pre-impacts would weaken and compromise the part before the big impact and it's demise. Especially upon water ingress in the pedal insert area.

    You are lucky you physically came out without a scratch.

    These products are more than strong enough for downhill, but cannot take the kind of repeated strikes that aluminum can.

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  6. #31
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    Just sent a set back for a different faliure, I had the non drive side crank crack and seperate all around the alloy insert that connects to the axle (through bb). 95kg rider on a hardtail, hopefully will be sorted through warrenty quickly. Cranks are 2 months old.

  7. #32
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    95K + hardtail seems to be the the magic formula for those cranks!

    Quote Originally Posted by thrower78 View Post
    Just sent a set back for a different faliure, I had the non drive side crank crack and seperate all around the alloy insert that connects to the axle (through bb). 95kg rider on a hardtail, hopefully will be sorted through warrenty quickly. Cranks are 2 months old.

  8. #33
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    Broken XO Crank

    I STRONGLY advise not to purchase . See the reviews on chain reaction
    SRAM X01 11 Speed Crankset | Chain Reaction Cycles


    UPDATE AND EDIT:
    I emailed SRAM and got an instant response that they would be in touch with CRC regarding my issue. AMAZING SRAM CUSTOMER SERIVCE.

    Also had a further response from CRC, saying that as a 'gesture of good will' they will give me vouchers to the value of the chainring. AMAZING CHAINREACTION CUSTOMER SERIVCE (just took them a while to come around to my predicament).
    Attached Thumbnails Attached Thumbnails Broken XO Crank-screen-shot-2014-07-03-21.19.54.jpg  

    Broken XO Crank-screen-shot-2014-07-03-21.19.46.jpg  

    Last edited by deanopatoni; 07-04-2014 at 11:52 AM.

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