A few months ago, I measured the end of the tapers on 2 different vintage T A bottom bracket spindles. One was a model 344 and the other a model 314. In both cases, size was exactly midway between ISO and JIS.
That migh
t explain why the TA cranks seem to work well with different styles of bott
om brackets.
Fred Rednor - Arlington, Virginia (USA)
> Last year
I spoke with Mike Barry
> about the compatability of TA cranks with
> b
ottom brackets - he said that they work with campy
> NR BB's fine. I s
till
> haven't set one up (TA) so I can't say from personal
> experienc
e - but I know
> Mike has had a lot of experience with them over the year
s
> so I trust his
> advise. He never mentioned older vs newer vintage
cranks.
> We all know that
> campy cranks changed dimensions slighly ov
er the years.
> Hope this helps.
> One of these days, I'm going to set
up that TA double
> compact crank - I have
> really grown to like that
gearing on my regular modern
> ride. It works great
> in the endless up
and down roads of north Georgia where you
> can pretty much
> count on
around 1000' of climbing/hour around Atlanta with
> some steeper
> str
etches here and there.
>
> Roman Stankus
> Atlanta, Georgia USA
>
> > -----Original Message-----
> > From: classicrendezvous-bounces@bik
elist.org
>
> > [mailto:classicrendezvous-bounces@bikelist.org]
> On
Behalf Of
> > Adam Hammond
> > Sent: Monday, April 06, 2009 12:56 PM
> > To: CR discussion list
> > Subject: [CR] BBs for TA Pro 5 Vis cran
ksarms: old vs.
>
> > new,symmetrical or not, taper styles
> >
>
> I posted this to the BOB list this morning, but
> thought CR
> > peo
ple might be even keener at spotting the
> differences or
> > similari
ties between the on- and off-topic TA cranks.
> >
> > Here is my quest
ion:
> >
> > I have in my possession one of the newer TA Pro 5 vis
>
> > cranksets -- produced in 2007. I also have a TA Axix
> BB,
> >
which is from the same year. The BB is 116mm wide,
> which I
> > have
always heard is the correct width for TA
> doubles.
> > This BB is com
pletely symmetric.
> >
> > I ran this setup on Fuji touring bike for a
few months
> last
> > year to test it out, and everything seemed in o
rder.
> There
> > wasn't much crankarm clearance on either chainstay (
I
> was
> > using a 135mm rear end and fairly beefy chainstays),
> b
ut
> > things seemed more or less centred.
> >
> > I was testing it
for the still-forthcoming custom
> frame I
> > expect to arrive in a
few months. In the meantime I've
> become
> > interested in this quest
ion of symmetricalness. For it
> seems
> > TA's older bottom brackets
for Pro 5 Vis doubles were
> not symmetrical.
> >
> > Piece of evide
nce number one: this chart from Sheldon
> Brown's website:
> >
> > h
ttp://www.sheldonbrown.com/harris/images/ta-bb-axles.gif
> >
> > This
suggests that the BB should be offset VERY
> slightly
> > (1.5mm) towa
rd the drive side.
> >
> > And this photo of a TA 344 axle (the very o
ne
> specified for
> > TA doubles in the above diagram) seems to show
an even
> more
> > significant driveside offset, though it is the same
> length as
> > my symmetrical Axix BB: 116mm. (It may be .5
> > lo
nger...)
> >
> > http://picasaweb.google.ca/
> site#5311728504161556194
> >
> > My question basically
is: did TA change their cranks
> for the
> > newer production runs to
make them work with
> symmetrical BBs
> > when they used to be design
ed for asymmetrical? If I
> were to
> > have mounted my TA cranks onto
the aforementioned Fuji
>
> > touring bike with one of the TA 344 axl
es, I would
> have had
> > one crankarm 8mm out from the chainstay, an
d the other
>
> > smacking straight into it.
> >
> > To throw a f
inal crankarm into the spokes: I have
> heard
> > various rumours that
the new TA production is designed
> for
> > JIS spindles (and that th
e Axix BBs use JIS spindles)
> --
> > would this explain all the confu
sion?
> >
> > Confused,
> >
> > Adam
> >
> >
> > --- Stri
pMime Report -- processed MIME parts ---
> multipart/alternative
> >
text/plain (text body -- kept)
> > text/html
> > ---
>
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