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  1. #1
    I wear two thongs
    Reputation: Eric Hoefer's Avatar
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    Jan 2004
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    External Vs. Internal BB differences

    I've got a quick question is there any interface difference between an External bearing BB and an Internal bearing BB? I know the difference between external and internal but I was wondering say if my bike uses a 63mm shell internal BB right now and I want to change to an external bearing setup will it fit my frame or do the new external BB's use a different frame interface?

    Thanks in advance for the help,
    -Eric
    Hiking is just walking where its okay to pee... Sometimes old people go hiking by accident. -Demetri Martin-

  2. #2
    Former Bike Wrench
    Reputation: mtnbiker72's Avatar
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    First off...your bike will either have a 68mm or 73mm BB shell (unless its a Italian road bike). The new external BB's are 100% compatible with both these sizes. There are a few full suspension designs (I believe the Fisher Sugar is an example) that external BB's interfere with the swingarm pivot point. But otherwise, there really aren't any other issues.

  3. #3
    I wear two thongs
    Reputation: Eric Hoefer's Avatar
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    Quote Originally Posted by mtnbiker72
    First off...your bike will either have a 68mm or 73mm BB shell (unless its a Italian road bike). The new external BB's are 100% compatible with both these sizes. There are a few full suspension designs (I believe the Fisher Sugar is an example) that external BB's interfere with the swingarm pivot point. But otherwise, there really aren't any other issues.
    your right its 68 I always get the 2 confused I always for some reason think 63 and 78 thanks for the response though, I have been wondering that for a while now.
    Hiking is just walking where its okay to pee... Sometimes old people go hiking by accident. -Demetri Martin-

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