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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 05-28-08, 10:18 PM   #1
rousseau
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Bottom bracket for 1984 Bianchi Campione D'Italia

I want to say first that I'm extremely grateful to everyone who has responded to other threads I've posted in this forum. This is an excellent resource!

The issue: Now that the bottom cup on the 20-plus-year-old threaded headset on my 1984 Bianchi Campione D'Italia has become pitted and needs replacing I've decided I'd best prepare for a time when my bottom bracket may need to be updated. Instead of relying on the catalogues on the counter of my LBS, which seem mostly Campy-free, though, I figured I'd like to go the Ebay route.

The question: I'm a clueless neophyte. How do I figure out what specifications are required for a bottom bracket on my bike? I know that I'm using a square taper one, because I ordered a crankset for it last year and that was indeed the right choice, but beyond that I know nothing. Italian or English? Size? Length? Etcetera? How do you learn all of this? Is there a standard for my particular year and model of Bianchi?
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Old 05-28-08, 10:39 PM   #2
Dersu Burrows
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Use calipers to measure the bottom bracket shell width. 68mm is English, 70mm Italian. Next, measure the bb spindle length. Crank arms must be removed to do this.
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Old 05-29-08, 11:40 AM   #3
evan_phi
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sheldon brown's site has a lot of info about this stuff.
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