• How does one work out which bottom bracket you need (road)?

    I.e, what criteria do you need to use (crankset, rear hub spacing) and how do you translate that into BB width?

    How do I tell which threading the BB shell is? Where do I measure from on the rear hub to determine spacing?

    I've googled extensively and now I have a headache.

    I need a BB for a Campy Athena crankset.

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