--- Jerome & Elizabeth Moos <jerrymoos@sbcglobal.net>
wrote:
> Assuming, of course, the two wheels are in fact the
> same size. If they are not, for instance with some
> TT frames and some small women's frames (including
> some Terrys) the line through the front and rear
> axles is not horizonal. How does one define BB Drop
> in this situation?
J&E M',
By "the same size" I meant , primarily, different size tires on same-sized rims, and secondarily, minute differences in rim diameters of the same nominal size.
In the case of TT frames and Terrys as you asked above, subtract BB height from THE REAR WHEEL ONLY.
Joe Starck
sum...bicycles
Madison, WI
>
> Regards,
>
> Jerry Moos
> Houston, TX
>
> Joe Starck <josephbstarck@yahoo.com> wrote:
> --- Tony Rentschler wrote:
>
> "...measure from the ground to the center of the
> bottom bracket spindle to get the bb height. Measure
> from a horizontal line running through the centers
> of
> the wheel axles to the bb spindle to get the bottom
> bracket 'drop.'"
>
> But Tony, usually only builders are equipped to
> measure from "...a horizontal line..." as you state
> above, i.e., they have fixtures and drawings and
> tools
> and such. SO ON AN ASSEMBLED BICYCLE, GIVEN THAT THE
> WHEELS WOULD BE IDENTICAL, IT'S EASIER AND QUITE
> ACCURATE TO SUBTRACT THE BB HEIGHT FROM THE WHEEL
> RADIUS TO DETERMINE BB DROP, don't you think?
>
> Joe Starck
> summumboojumbonum bicycles
> Madison, WI
>
>
>
>
>
>
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