"Andy Chequer" <andy@(youdontwantthisbitinit)thisisasparagus.com> wrote in
message
news:[email protected]...
>
> "bomba" <
[email protected]> wrote in message
>
news[email protected]...
> > On Fri, 14 May 2004 10:27:07 +0100, Andy Chequer wrote:
> >
> > >> The reasoning behind these designs is that the BB
> > >> shell is too small
to
> > >> fit in decent bearings and a decent spindle. So, why
> > >> not just make
the
> BB
> > >> shells bigger?
> > >
> > > Industry inertia. Seen any bikes with 1.5" heads
> > > recently?
> >
> > The 1.5" headset was a limited idea, that is still in
> > use for many of
the
> > bikes for which it was designed (freeride single-crown
> > bikes).
> >
> > A larger BB shell would benefit all mtbs. But of course,
> > you have to get past industry intertia, as you say.
>
> JOOI, what were the issues with ISIS? ISTR that some
> cheaper ones were getting failed axles but I'm guessing
> that the bearings are the likely
weak
> point.
>
> Anecdotal as it may be, but Binkie's had taper Syncros
> cranks/UN91 for a couple of years and I've had no hassles.
> I don't leave the ground much but my Clydesdale legs
> generally bring out the worst in crank/BB combos. All
I'm
> saying is that design is one aspect, materials and
> manufacture are others.
>
> Spanish thing Spadey pointed out is interesting though.
> That press fit or threaded?
>
> Andy Chequer
I suspect its press fit, but I could be wrong. If they
combined it with Profiles new evolution style BB then it
would be superb - good size axle and bearings, press fit so
no threads to feck up and easy installation/removal
"The Evolution bottom bracket confronts these variations
with a male/female threaded cup design that secures itself
to the outside edges of the frame bottom bracket shell. With
use of the proprietary Evolution wrenches (included with
your Evolution purchase when ordering online), the Evolution
bottom bracket is self-installing and self-removing by
either tightening or loosening the respective halves to each
other. No more presses, hammers and chisels needed! Because
the Evolution bottom bracket is essentially a single unit
when it is installed, perfect bearing alignment is achieved
thus allowing the crank arm assembly to spin freely like
never before"
http://www.profileracing.com/
Steve.