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  1. #1
    mtbr member
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    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
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  3. #3
    Plays with tools
    Reputation: customfab's Avatar
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    Jun 2008
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    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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