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Thread: Bottom Bracket Sizing?

  1. #3
    Trail Rider
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    egoo's Avatar
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    The best way is to measure the tube that the bb goes into. It will either be 68 or 73mm. Most newer mtbs have a 73. Get a shimano un72 if it's not splined, they last a long time, and they are lightweight. Should be about $40.

  2. #2
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    I think I figured it out... I love the web. I'll explain what I learned in case others have the same question...

    The 2 measurements are shell width and axle width.
    The shell width is the width of basically what fits into the bike frame. It should be either 68 or 73mm.

    I did find a number on the end of the shell that confirmed my measurement.... 68mm.

    Here's a pretty cool length conversion utility that may help out.
    http://www.boeckeler.com/metrology/length_equiv.html

  3. #1
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    Bottom Bracket Sizing?

    I feel like I should already know this but I don't...

    So, how do I correctly size the bottom bracket for my bike?

    I took the old one off and it doesn't list any sizing on it.

    I measured the axle width and am pretty sure that measurement is 113mm. But I don't know how to take the 2nd measurement. I guess my 2 options are 68mm or 73mm... Help Please???

    Thanks,
    Phillip
    Last edited by pwpatton; 12-21-2002 at 10:18 PM.

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