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  1. #1
    mtbr member
    Join Date
    Jan 2010

    PF BB cup coming out of frame

    Drivetrain side, the cup holding the bearings is coming out of the frame. I can pound it back in with a mallet, but it vibrates back out within one ride. How do I get this to stay in the frame? Thanks!

  2. #2
    Join Date
    Aug 2012

  3. #3
    Plays with tools
    Reputation: customfab's Avatar
    Join Date
    Jun 2008
    First step is to figure out if your problem is with the PF30 assembly or with with Frame. If it's the cup, just replace it. If it's the frame you'll need to either get the correct retaining compound or preferably explore warranty options.

    Press fit bottom brackets aren't bad systems, but they need precision that a lot of frame manufacturers aren't capable or willing to deliver.

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