Re: External-bearing BBs?

Someone wrote:

>>>> Quick question on external-bearing BB's: Are they all compatible?
>>>> Are the shaft diameters and spacing of these integrated cranks
>>>> the same? =C2=A0I haven't worked on enough of these to find out by
>>>> myself yet. =C2=A0I have a ****mano FC-R700 crankset, and someone nea=
r
>>>> me is selling a set of Zipp ceramic external-bearing BB for
>>>> cheap, but need to know if the two are compatible before putting
>>>> my money down.

>>> Don't know much about Zipp bearings, but if you want the ultimate
>>> in external bearing BB's, check out the new Phil Wood:

=C2=A0http://www.philwood.com/BB-Outboard%20Set.htm

>> I don't see what holds the spindle and what sort of spindle fits
>> that assembly. =C2=A0I also doubt what the free-fit aluminum sleeve an=
d
>> a free fit (no taper or press) spindle that seems to fit in that
>> sleeve won't fret giving a grinding squeaking BB. =C2=A0I think PW wou=
ld
>> do better with a cross section view of the assembly than a ****ny
>> photograph with inadequate words to explain what the selected view
>> shows.

> OK, presuming the outboard bearing is from the Zipp VumaQuad
> crankset, how about checking out the installation manual, which does
> show the spindle interface:

 http://www.zipp.com/****tals/0/Products/Cranks/Compact_Crank_Manual.pdf

Oh, this shows the Isis crank interface, which is dead anyway because
it is a flawed design based on the wrong assumptions about
steel-to-aluminum interfaces.  We have also read about spindle
failures, here in this newsgroup.  However, the endless pdf does not
show what locates the spindle in the bearings, radially or axially.
--=20
Jobst Brandt