Are all EBB's sized the same? (XXIX Content)- Mtbr.com
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  1. #1
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    Are all EBB's sized the same? (XXIX Content)

    I have a 2007 Raleigh XXIX with the set screw EBB, NOT the split shell they went to in later years. I have never had a problem with it moving, squeaking, creaking anything - until I installed a new chainring of a different size and had to reposition it. Now it slips just enough to slacken my chainline, and that just drives me nuts to see that chain sagging ever so-slightly...

    So the question is, can I just order a Bushnell EBB (expanding wedge) and pop it in there? I can't find any sizing choices so am I to assume that they are a universal size?

    Here's what I am looking at:
    Universal Cycles -- Bushnell Eccentric Bottom Bracket Shell

    If anyone has any other ideas or experiences, please let me know. And the shell is not ovalized, before that gets suggested.

  2. #2
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    Quote Originally Posted by Mr_Nice_Guy View Post
    So the question is, can I just order a Bushnell EBB (expanding wedge) and pop it in there? I can't find any sizing choices so am I to assume that they are a universal size?
    That's a good question and I think I can help you out. When I get home, I'll measure it up, as I have both in my garage. I've got a bushnell in my salsa, and my Fiancee has a XXIX with the set screws. I dont think that there is a "universal " size standard for EBB's. I know for a fact that Niner (for example) uses a different size BB shell than most. I dont't know if that's true for Raliegh and other EBB manufacturers.

    Incidentally, she does not have any significant issues with slippage. I think it does loosen up over time, but I've not met an EBB that doesnt have this same problem. I have experience with several Niner EBBs (both types), Bushnell, Whatever is in the XXIX, Whatever is in the GF Rig, and maybe another type. They've all slipped to some extent.

    My friend ordered a Carver ebb for his GF Rig and he liked that, so there's another option for you to check out.

    Stay tuned, I'll see if I can remember to measure the EBB shells for you.

  3. #3
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    P.S. I dont like the 4mm set screw on the Bushnell. It's a pain in the ass to torque down a bolt that small.

  4. #4
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    I've just ordered a Carver for my Peace 9r as I prefer the Wedge type EBB

  5. #5
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    Thank you, I look forward to your results.

  6. #6
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    Also interested in the info. I've got a Zion 737 EBB and am looking for options for replacing the stock BB insert.

  7. #7
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    The set screws on my XXIX were 4mm and really shallow. I ended up replacing them w/ longer screws that had a deeper 4mm recess. The new screws worked much better.

  8. #8
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    Quote Originally Posted by jcufari View Post
    The set screws on my XXIX were 4mm and really shallow. I ended up replacing them w/ longer screws that had a deeper 4mm recess. The new screws worked much better.
    Happen to remember where you got them?

  9. #9
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    Quote Originally Posted by BShow View Post
    That's a good question and I think I can help you out. When I get home, I'll measure it up, as I have both in my garage. I've got a bushnell in my salsa, and my Fiancee has a XXIX with the set screws. I dont think that there is a "universal " size standard for EBB's. I know for a fact that Niner (for example) uses a different size BB shell than most. I dont't know if that's true for Raliegh and other EBB manufacturers.

    Incidentally, she does not have any significant issues with slippage. I think it does loosen up over time, but I've not met an EBB that doesnt have this same problem. I have experience with several Niner EBBs (both types), Bushnell, Whatever is in the XXIX, Whatever is in the GF Rig, and maybe another type. They've all slipped to some extent.

    My friend ordered a Carver ebb for his GF Rig and he liked that, so there's another option for you to check out.

    Stay tuned, I'll see if I can remember to measure the EBB shells for you.
    Any chance you got around to this?

  10. #10
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    I'd take the screws down to the local fastener specialist and see if they have something better. Also remove the insert and check it for wear where the screws were sitting. Sometimes they slip back into the same spot.

    Another option is to rotate the insert to the opposite plane, so if the thread's centre used to be below the mid point, move it to above. The point is that there's always 2 options for positioning an ebb for any given chain length. Moving it might put it in a position where slippage would tighten the chain, as opposed to loosening it.
    I see hills.

    I want to climb them.

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