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  1. #1
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    Mongoose Rockadile BB Confusion

    Hi,

    I have been having some trouble figuring out the different types of bottom brackets, how they fit into the frame and so on. I understand there are cup and cone ones, sealed cartridge, external and so on.

    How do you recognize each type of BB and what tools are needed to remove/install them and what are the steps to do that?

    I know from the specs that my Mongoose Rockadile has a VP semi cartridge, but what exactly does this mean?

    I hope this question is not too open ended...

  2. #2
    Junior Member
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    Oct 2008
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    How the BB and crank connects is the first place to look. Most likely it will be square taper, (which is a square bar with a taper to it). If its not, then it could be one of a few other things like ISIS, cottered, or some other new stuff I'm not familiar with. If the bike is very old, it may have a single crank bottom bracket, where one piece of metal goes from one pedal, through the bb, chainrings, and finally to the other pedal.

    If it is a square taper, then look at how it connects to the frame. If it has a series of recessed notches in a ring then it is probably a sealed bb. If there is a lock ring, with notches on the outside of it then its bearings are probably accessible with the proper tools.

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