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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 08-08-06, 05:37 PM   #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
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Old 08-08-06, 05:42 PM   #2
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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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Old 08-08-06, 07:11 PM   #3
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The size is most likely stamped on the side of the cartridge. Take it off and look at it.
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Old 08-08-06, 07:28 PM   #4
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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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