Eccentric Bottom Bracket help!-
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  1. #1
    mtbr member
    Join Date
    May 2015

    Eccentric Bottom Bracket help!

    I'm trying to replace the power spline BB in my Haro Ally SS. It has an EBB. When I try loosening the BB, the EBB is moving with it, so I can't remove the power spline (it all just turns together). The bolts holding the EBB to the frame are tight. I don't understand why the the EBB would be turning - if the bolts under the BB shell are tight, shouldn't the EBB not be able to turn?

  2. #2
    nothing to see here
    Reputation: Stevob's Avatar
    Join Date
    Feb 2009
    Silly question first...

    Are you loosening it in the correct direction?

    It shouldn't slip, but if it is, I would remove the ebb, clean and re-grease it, grease the bolts that tighten it, reinstall and tighten it and try again. If you try to tighten the ebb without grease on the interface between the frame and ebb, you won't get it tight enough evenly and it may loosen again.

    Sounds like the cups had little to no grease on the threads.
    I see hills.

    I want to climb them.

  3. #3
    mtbr member
    Join Date
    May 2015
    Quote Originally Posted by Stevob View Post
    Silly question first...

    Are you loosening it in the correct direction?
    Not a silly question at all, especially since I'm working with the bike upside down - but, yes, I double-checked to make sure I was turning correctly on left vs drive side, etc.

    Thanks for the suggestion,Stevob - I've got the bolts soaking in penetrating grease right now becasuse they're so rusted I can't loosen them. Once free I'll follow your advice and take out EBB and regrease where needed.

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