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  1. #1
    Senior Member ls0725's Avatar
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    Shimano BB question

    i have been checking on Shimano bottom bracket types and noted that there is a Hollowtech and an Octalink. Are they the same thing? What is the difference between the 2 if ever not the same?

    Do they use the same tools to remove/install?

    Thanks replies to the newbie question.

  2. #2
    Senior Member
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    Easy answer is NO they are not the same. For hollowtech you need a hollowtech crank. The octoliink is a cartridge type bb. For this type you need a crank set that is compatible.

  3. #3
    Senior Member CACycling's Avatar
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    In Octolink, the spindle is part of the BB (much like a traditional square taper BB). In Hollowtech, the spindle is part of the crankset.

  4. #4
    cab horn
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    Quote Originally Posted by ls0725 View Post
    i have been checking on Shimano bottom bracket types and noted that there is a Hollowtech and an Octalink. Are they the same thing? What is the difference between the 2 if ever not the same?

    Do they use the same tools to remove/install?

    Thanks replies to the newbie question.
    Octalink is like a square taper shimano cart bb except the square taper is a splined interface. Hollowtech is an external bottom bracket design. Cranks and bbs are not interchangeable between the two.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  5. #5
    biked well well biked's Avatar
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    Keep in mind, there were Octalink cranks that were Hollowtech. The "hollowtech"name means the crankarms are hollow more or less, some fancy Shimano tech. Hollowtech II is the next generation and are external bearing-
    Last edited by well biked; 01-21-10 at 02:50 PM.

  6. #6
    cab horn
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    Quote Originally Posted by well biked View Post
    Keep in mind, there were Octalink cranks that were Hollowtech. The "hollowtech"name means the crankarms are hollow more or less, some fancy Shimano tech. Hollowtech II is the next generation and are external bearing-
    Op is talking about hollowtech bb's, I don't think any of those were external?
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  7. #7
    biked well well biked's Avatar
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    Quote Originally Posted by operator View Post
    Op is talking about hollowtech bb's,
    Ah, I see. The OP should disregard what I said unless there's confusion between "Hollowtech Octalink" cranksets that use Octalink bb's, and Hollowtech II cranksets that use the external bearings.

  8. #8
    Elitist Troglodyte DMF's Avatar
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    Hollowtech II is external.

    Hollowtech (I) is Octalink (the axle of which is hollow).
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

  9. #9
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    Poke around in here. Look for the part break down drawings. http://techdocs.shimano.com/techdocs/index.jsp

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