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  1. #1
    mtbr member
    Join Date
    Nov 2013

    AIR9 RDO - PF30 / BOR XC666 problem

    Hi All

    I'm new here on the forum Allow me to quickly introduce myself..
    I'm a Belgian XC rider that has 2 Niners. (Jet 9 RDO + Air9 RDO)
    However on my AIR9 I have a fair amount of issues with my BOR Crank XC666. My LBS is also in the dark and proposes to use a Sram XO crank. (using GPX) Not really fond of replacing this (expensive) crank already. I was wondering if someone here could help? I'm not a techie so I'll try to explain the best I can..


    After some time my crank gets a bit pushed out of the PF30 BB. This results in shifting problems on my rear cog. (shift onto my 36 cog). I'll have to go to my LBS to get this fixed. (sometimes twice a month!) Also when I ride in rainy conditions, dirt is coming very quickly between the seals. Very annoying to listen to a "sandy crank" Extensive cleaning doesn't help.

    Anyone who could help me out? If more info is needed, let me know.

    I'll post some pics of my rides later on in the RDO thread

    Crank: BOR 666XC-29er - 2X - Smart Spindle System | B.O.R - Germany

    PS: I already looked into the "pf30 experiance dbb" thread but have not found a solution yet..


  2. #2
    mtbr member
    Join Date
    Jun 2010
    There are a lot of problems with the Bor bearings. My own experience is not good either. I moved my Tune Crank which is the same principle as Bor to my Rip which uses BSA.

    I know that Busybee (importer of Niner and Bor) is gonna try to use Phil Wood Bearings because of these problems.

    Perhaps you can contact them. You can always Pb me and write in dutch if that is easier.

  3. #3
    mtbr member
    Reputation: CarManDSL's Avatar
    Join Date
    Jul 2011
    On my Air9 RDO rigid, I installed the Sram PF30 BB and run XX1 cranks.

    Installed with a very very light coating of grease on the frame where cups press in.

    No squeaks. No issues.
    17 990 Element BC Ed - 25.5 lb burly
    15 Enduro Expert 29, SW build - 27.6
    14 SW Epic WC - 21.8
    12 Niner Air9RDO -16.4

  4. #4
    mtbr member
    Reputation: brightsky's Avatar
    Join Date
    Dec 2008
    Not familiar with those cranks, but the bb30 cranks I have installed (SRAM) include a tension adjuster on the non drive.

    Overall, it just sounds like your cranks are loosening up. Maybe a wave washer and a little thread locker would solve it.

  5. #5
    mtbr member
    Join Date
    Nov 2013
    thx all for the comments. I'll check if the problem can be solved with a Sram bb.

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