See this drawing of a spindle on Sheldon Brown's site:
http://www.sheldonbrown.com/
The centre dimension, "B" would be associated with the BB width, but as you say, different cups will be a factor. Also, on some spindles the shoulder to where this is measured is rounded and not sharply defined.
On 07/04/2010 12:02 AM, r cielec wrote:
> Ahoy !
> Where does one measure a spindle to determine the intended BB shell width? Is this even possible given that the associated cups may be a factor? Yes, for spindles not readily marked.
> Thanks.
> Richard Cielec
> Chicago, Illinois; U.S.A.
>
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John Betmanis Woodstock, Ontario Canada