Air9 Carbon - bottom bracket metal insert- Mtbr.com
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  1. #1
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    Bonking ... not feelin' well Air9 Carbon - bottom bracket metal insert

    My son called me from the trail tonight and said that his "bottom bracket had fallen out."

    Well a couple of problems. NDS crank arm had come loose. Splines look a little wobbled out but will see once I figure out the other problem.

    CYA inserts with BSA bearings. But the inserts didn't come out. The metal shell that the inserts go into (2 pieces, asymmetric with cutouts for internal cable routing) both slid out with hand force.

    The larger of the two pieces has a small hole at the top and the bottom that appear to be for a set screw. It also has a machined male flange and the smaller piece has a female receiver flange.

    My impression is these pieces should not have come out of the frame. I don't know how you would ever get the CYA adapters out with a drift or other tool if these inserts just slide out.

    Any help would be appreciated. I assume these should be held in with something?

    Air9 Carbon - bottom bracket metal insert-img_20190314_005320114.jpg
    Air9 Carbon - bottom bracket metal insert-img_20190314_005330599.jpg
    Air9 Carbon - bottom bracket metal insert-img_20190314_005337579.jpg

  2. #2
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    My Air9 Carbon did the same thing. Whatever they used to bond the aluminum to the carbon was not strong enough. Luckily mine fell apart while it was still under warranty and I got an RDO as a replacement.

    My guess is that the frame is probably ruined now. A thorough cleaning and reapplication of some type of epoxy may be enough to temporarily rebond the aluminum to the shell and may allow you to get the BB parts out.

  3. #3
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    Took it to the local (former) Niner dealer. They said they couldn't repair it. Pointed me to guy who does carbon fiber repair on the other side of the state, but I'm not hopeful on cost...

    May give it a go myself with some old glass and resin skills from aerospace. The aluminum isn't even friction fit anymore so definitely need some buildup. Might need to take it to a machine shop and have it honed like a gas engine cylinder to get a good fit before epoxy bonds it.

  4. #4
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    Bonking ... not feelin' well

    Air9 Carbon - bottom bracket metal insert-img_20190314_172819530_hdr.jpg
    Air9 Carbon - bottom bracket metal insert-img_20190314_172729817_hdr.jpgAir9 Carbon - bottom bracket metal insert-img_20190314_172742099.jpg

  5. #5
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    That's a big bummer. Have you contacted niner about a possible crash replacement? I assume it's out of warranty but they may work with you on a whole new frame.
    "I'm the fastest of the slow guys"

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