2016 Air 9 RDO bottom bracket standard- Mtbr.com
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  1. #1
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    2016 Air 9 RDO bottom bracket standard

    So I was going to install a raceface next sl crank to my air 9 RDO, ordered a pf30 bottom bracket. After removing the old crank and BB I found out the new BB doesn't fit.

    As far as I understand PF30 has a diameter of 46mm, but my frame has an internal diameter of 41-42mm instead. Anyone encountered this problem? I used the same bottom bracket on a BSB9 and it fitted no problem.

  2. #2
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    pf30 has an external diameter of 42mm.

    https://wheelsmfg.com/pf30-tech
    "I'm the fastest of the slow guys"

  3. #3
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    That link you shared clearly indicates that the hub shell for pf30 is 46mm. 42mm is the bearing OD. Too many BB standards complicating things

  4. #4
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    Oops sorry about that. This is another reason I love good ol'e English threaded.

  5. #5
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    Quote Originally Posted by Lans View Post
    So I was going to install a raceface next sl crank to my air 9 RDO, ordered a pf30 bottom bracket. After removing the old crank and BB I found out the new BB doesn't fit.

    As far as I understand PF30 has a diameter of 46mm, but my frame has an internal diameter of 41-42mm instead. Anyone encountered this problem? I used the same bottom bracket on a BSB9 and it fitted no problem.
    Do you have a One 9 RDO frame with one of the various
    bb inserts installed? I have an Air 9 RDO and it definitely uses a PF30 bottom bracket.

  6. #6
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    No, Mine is an Air9RDO. I thought it would be PF30 like my BSB9 but the diameter of the BB hole is too small for pf30 to fit. It seems to be BB86 but the length is too short. I'll take some pics when I get to dismantling the BB.

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