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  1. #1
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    How do I figure out what size Bottom Bracket I need?

    Hi, I am building up a road frame, and I need to know what size Bottom Bracket I need to order. Im building a 2003 Orbea Mitis road frame. The cups are 68mm and the threads are english. I have no idea what length spindle I need. Ill be building with a double ring Ultegra crank. I tried emailing Orbea, but had no luck there. Roadbikereview was useless so far. Can anybody help me here? Hopefully somebody knows what size I need. If now, how do i measure it. Thanks
    -Bill

  2. #2
    cyclist/gearhead/cycli... moxfyre's Avatar
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    Most double cranks take a 107 to 110 mm spindle... Sheldon Brown has the data at http://sheldonbrown.com/bbsize.html#ultegra

    Looks like for a 1998-2004 Ultegra double, you need a 110 mm Octalink V1 spindle. But if you use a 2005 or 2006 crank set, it has an integrated BB spindle and you just need to buy the bearing cups.
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  3. #3
    You need a new bike supcom's Avatar
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    The size is most likely stamped on the side of the cartridge. Take it off and look at it.

  4. #4
    Senior Member capwater's Avatar
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    If it's Octalink Ultegra you'll need a 68 x 109.5 BB, either BB5500 or BB6500.

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