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  1. #1
    purity of essence scotch's Avatar
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    Correct Bb for Shimano 105 170mm triple crankset?

    I just ordered this one.

    For the Bb, my LBS says the Ultegra 6600 is compatible. I just don't know if I need the 68mm (English) or the 70mm (Italian). I'm new at drive train specs.

    Thanks a ton.
    Neurosis is always a substitute for legitimate suffering.

    - Jung

  2. #2
    Token Brit SpinDr's Avatar
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    What bike are you running? Most BBs are English thread, but Italian manufacturers tend to be loyal to their country's standards.
    http://the-coffee-stop.blogspot.com/
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    Pain is merely weakness leaving the body...

  3. #3
    purity of essence scotch's Avatar
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    Quote Originally Posted by SpinDr View Post
    What bike are you running? Most BBs are English thread, but Italian manufacturers tend to be loyal to their country's standards.
    Ah, sorry about that. It's a 2004 Bianchi Axis, which came with:

    - Sugino XD-500D crankset
    - Cartridge Bb, 107mm spindle, 68mm English shell width

    This bike was made in Taiwan as far as I know.

    Thanks.
    Neurosis is always a substitute for legitimate suffering.

    - Jung

  4. #4
    Senior Member
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    Quote Originally Posted by scotch View Post
    Ah, sorry about that. It's a 2004 Bianchi Axis, which came with:

    - Sugino XD-500D crankset
    - Cartridge Bb, 107mm spindle, 68mm English shell width



    Thanks.

    There's your answer ..... a 68mm English BB shell width

  5. #5
    purity of essence scotch's Avatar
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    great. thanks for the help!
    Neurosis is always a substitute for legitimate suffering.

    - Jung

  6. #6
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    Give some thought to getting rid of the 30 and replacing it with a 24T. The reason for a triple is low gears. You may not need a 24-27 , but it is nice to have when you do need it.
    The index shifting won't be as slick, but with practice you will find how how easy it is.

  7. #7
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    Quote Originally Posted by davidad View Post
    Give some thought to getting rid of the 30 and replacing it with a 24T. The reason for a triple is low gears. You may not need a 24-27 , but it is nice to have when you do need it.
    The index shifting won't be as slick, but with practice you will find how how easy it is.
    The OP hasn't said anything about needing a lower granny gear. A 30-27 combination usually low enough. Going from a 30 to a 24 is a huge change and can cause shifting and dropped chain problems.

  8. #8
    cab horn
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    Quote Originally Posted by Al1943 View Post
    The OP hasn't said anything about needing a lower granny gear. A 30-27 combination usually low enough. Going from a 30 to a 24 is a huge change and can cause shifting and dropped chain problems.
    +1 Wtf?
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  9. #9
    purity of essence scotch's Avatar
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    The new Ultegra 6600 Bb and 105 crank set are working like a charm. I also ended up getting a new Deore XT cluster; I figured for another $68, what the hell. Shifting is super smooth and crisp. This is definitely an upgrade.





    Thanks again for the help.
    Neurosis is always a substitute for legitimate suffering.

    - Jung

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