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  1. #1
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    Campy BB30 Adapter Question

    there appears to be two different sizes possible, 68x42 and 68x46. what do the 42mm and 46mm measure? is that frame specific or just extra length in the cups? thanks.

  2. #2
    Senior Member
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    The 42 and 46 dimensions should be the bearing diameters. True BB30 has a 42mm bearings.

    http://www.bb30standard.com/tech_ima...30standard.pdf

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