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  1. #1
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    Difference BB 30 & "other" bb

    I've changed my bottom bracket over the years several times and now am using ISIS.

    I know what BB30 is but I've never seen a frame that is setup for the BB30 without it.

    Am I getting the impression that a bike frame has to be built for the BB30? and no other BB can be used? If so, this means I can't decide to put a BB30 on my bike that is currently using ISIS?

    Looking at the bb frame, what does the setup for a BB30 look like? How does it differ from the "normal", such as the threaded bb for using ISIS, Octalink, etc.

  2. #2
    Senior Member CACycling's Avatar
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    BB30 uses a completely different BB shell. It is larger diameter and narrower than what you are used to seeing.

  3. #3
    Collector of Useless Info
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    No, a standard frame can't use a BB30 bottom bracket. It's way different- larger diameter with bearings that are pressed right into the frame.

    If your frame is already BB30, you can get an adapter that converts it to a standard english bottom bracket. I don't know why anyone would do that, but it's possible.

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    The bearings pressed in? I thought the bearings were on the outside? If I have a bike that is BB30, is replacing the bearings something I can do myself? On a replacement or just a frame, are the bearings something I can press in using a C clamp? Is this something most bike shops would have the tool to press the bearings in?

  5. #5
    cab horn
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    Quote Originally Posted by Lawrence08648 View Post
    The bearings pressed in? I thought the bearings were on the outside? If I have a bike that is BB30, is replacing the bearings something I can do myself? On a replacement or just a frame, are the bearings something I can press in using a C clamp? Is this something most bike shops would have the tool to press the bearings in?
    A high end shop will have tools to deal with BB30. It's not extremely common yet so I doubt most regular road shops will have the tools to service it.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  6. #6
    coprolite fietsbob's Avatar
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    external bearing crank, but the frame was made wider so the big diameter bearings, with lots of little balls is back internal in the frame.

    Kind of like a 3 piece crank adapter for an American One piece crank Frame.
    if you want to use older spline or square taper BB's back in the day

    perhaps look for a Normal BB frame ... How about a metal one?

  7. #7
    cab horn
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    Quote Originally Posted by fietsbob View Post
    external bearing crank, but the frame was made wider so the big diameter bearings, with lots of little balls is back internal in the frame.

    Kind of like a 3 piece crank adapter for an American One piece crank Frame.
    if you want to use older spline or square taper BB's back in the day

    perhaps look for a Normal BB frame ... How about a metal one?
    Looks like somebody was smoking a bit too much pot today.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

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