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  1. #1
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    New question here. A big problem with my bottom bracket

    Hi all, this is a first post for me. I'm looking for some advice and this seems like a good place to find it.

    I bought a brand new 2013 Kona Unit about a month ago and it's been great, but yesterday I felt some give in the cranks. When I got home I noticed I could push the bottom bracket (FSA MegaExo) from side to side. It's not just a matter of millimetres; I can push it all the way.

    The photos should make it clear.

    So I'm very disappointed. My only other mountain bike was a Specialized Hardrock, which I had from the early 90s until last year, when I finally(!) decided to upgrade. I never had a problem with the BB on that bike.

    Anyway, I'm just wondering what I should do. I don't go in for much in the way of maintenance myself if I can help it, but is there anything I can do here, aside from replacing it and taking it to a repair shop?

    I checked everything was tight. No adjustment I make to the main bolt makes any difference.
    Attached Thumbnails Attached Thumbnails A big problem with my bottom bracket-bb-3.jpg  

    A big problem with my bottom bracket-bb-2.jpg  

    A big problem with my bottom bracket-bb-1.jpg  


  2. #2
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    Take the bike back to the shop you brought it from.

    instal advice here
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  3. #3
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    Thanks for the reply, mitzikatzi. The trouble is, I bought it on evanscycles.com (of necessity), and I'm not very confident in their ability to help me out in this case. I guess I'll let them know--maybe they'll send me a new one.

  4. #4
    www.4estbiker.nl
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    Looks to me that your left crankarm has slided of the crank.
    Losen the 2 bolts on the left arm and push the arm back on the crank.
    My bike is never the problem and can always be faster than I can...
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  5. #5
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    Quote Originally Posted by aandegrens View Post
    Looks to me that your left crankarm has slided of the crank.
    Losen the 2 bolts on the left arm and push the arm back on the crank.
    Did you try this? I would go as far as loosing them all the way and removing the arm. Look at the surface and make sure they are not badly damaged. If everything is tight and it is still loose, it could be that the "ridges" that keep things tight have worn down and are causing the play.
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  6. #6
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    Maybe it wasn't such a big problem after all

    Quote Originally Posted by aandegrens View Post
    Looks to me that your left crankarm has slided of the crank.
    Losen the 2 bolts on the left arm and push the arm back on the crank.
    That was it! I feel kind of foolish now, because that hadn't even occurred to me. But once I tried it, it seemed obvious. The crank had simply been loose, possibly since I got it.

    At least, I think it's fixed. I've only tested it around the block so far. I hope I didn't damage it pushing it back and forth.

    Thanks to all for the help.

  7. #7
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    Did you follow the FSA instructions on tightening the crank arm?
    I found I needed to re-torque the bolts after each ride for a couple of rides to keep the crank arm from coming loose.

  8. #8
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    Quote Originally Posted by Slash5 View Post
    Did you follow the FSA instructions on tightening the crank arm?
    I found I needed to re-torque the bolts after each ride for a couple of rides to keep the crank arm from coming loose.
    No, I didn't do that. Guess I should have a look at those instructions.

  9. #9
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    The preload bolt needs to be set before tightening the crank arm screws.
    The crank arm screws need to be tightened alternately or they can strip the threads.

  10. #10
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    Quote Originally Posted by Slash5 View Post
    The preload bolt needs to be set before tightening the crank arm screws.
    The crank arm screws need to be tightened alternately or they can strip the threads.
    Cool, I'll follow your advice and do it right this time. Thanks for your help.

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