best light ISIS bb ?

botfood said:

Ive been poking around old posts, but haven't seen much recently on
the newer ISIS bb out now.

----------
one OEM I have heard back from is KCNC regarding their scandium race
lite BB ,which is very light at 133gr. They say its design life is
about 5000k under 'normal use'. Which is only around 3000 miles,
right? geez, I appreciate the honest and informative answer, but am a
little shocked at the lifespan.

anyway, I am wondering now if all the super-light BB have this kind of
short design life?

d

botfood said:

Ive been poking around old posts, but haven't seen much recently on
the newer ISIS bb out now.Looks like American Classic has had some
durability issues in the past, but I am wondering if recent 06-07
design changes have corrected?

currently I am looking at the AC and FSA Platinum Pro Megaquad Ti ISIS
as they are about the same price... the FSA is maybe 30 or 40gr
heavier, but I'd be willing to give that up if there is a big
difference in durability.

I am not a huge guy at 160#, and would like to put something nice and
light in a new bike I am building up, but don't want a BB to die TOO
quickly!

comments?

ISIS is by design a poor one and ti BB spindles, saving a coupla
ounces on something that may break is a poor choice of where to put $,
IMO.

botfood said:

On Apr 26, 9:47 am, botfood <[email hidden]> wrote:> Ive been poking around old posts, but haven't seen much recently on

Quoted message said:

the newer ISIS bb out now.

----------
one OEM I have heard back from is KCNC regarding their scandium race
lite BB ,which is very light at 133gr. They say its design life is
about 5000k under 'normal use'. Which is only around 3000 miles,
right? geez, I appreciate the honest and informative answer, but am a
little shocked at the lifespan.

anyway, I am wondering now if all the super-light BB have this kind of
short design life?

d

Not the lightness but the size of the ISIS BB spindle makes for teeny
bearings. Poor design that is leaving the marketplace quickly, with
the exception of Zipp. If ya haven't bought the crank, look for many
others like shimano and Campagnolo.

Qui si parla Campagnolo said:

Quoted message said:

anyway, I am wondering now if all the super-light BB have this kind of
short design life?

Not the lightness but the size of the ISIS BB spindle makes for teeny
bearings. Poor design that is leaving the marketplace quickly,...

----------------

The octalink sure is on the way out... but the ISIS seems to have a
fair following. I am hoping that somebody has or will develop a good
light BB to match the stronglight crankset I just got on ebay. 😉
Seems like with needle bearings, or preloaded angular contact bearings
(like a car) durability would go way up compared to ball bearings...
but then you have to wrestle with higher drag and probably a little
more weight.

perhaps the increased use of ceramic balls will help? but if the balls
last longer, then the cup/cones will be what fails, and much harder to
replace than if the balls fail and leave the cup/cone ok.

In article <[email hidden]>,

botfood said:

Qui si parla Campagnolo said:

Quoted message said:

anyway, I am wondering now if all the super-light BB have this kind of
short design life?

Not the lightness but the size of the ISIS BB spindle makes for teeny
bearings. Poor design that is leaving the marketplace quickly,...

----------------

The octalink sure is on the way out... but the ISIS seems to have a
fair following. I am hoping that somebody has or will develop a good
light BB to match the stronglight crankset I just got on ebay. 😉
Seems like with needle bearings, or preloaded angular contact bearings
(like a car) durability would go way up compared to ball bearings...
but then you have to wrestle with higher drag and probably a little
more weight.

Name an ISIS maker that hasn't moved to an external-bearing crank as
their primary product. I wouldn't be surprised to hear there is one, but
of the three manufacturers who collaborated to create it, Truvativ and
Race Face are both offering external-bearing cranks as their top
product, and Chris King doesn't sell cranks or BBs.

Quoted message said:

perhaps the increased use of ceramic balls will help? but if the balls
last longer, then the cup/cones will be what fails, and much harder to
replace than if the balls fail and leave the cup/cone ok.

There's now an "ISIS Overdrive" spec for a 48 mm diameter bottom
bracket, but a quick search turned up only Haro actually building a
frame with that BB, on a BMX.

FSA has a fairly frank-sounding technical discussion of the current
state of the art, including tricks to make ISIS work better (four
bearings...), and their own proposed oversize-BB standard (MegaTech).

As a fan of the English language, I note that internal capitalization
(aka CamelCase) has become so common that in the FSA FAQ, they just
assume "ISIS Overdrive" should be "OverDrive." I am happy to say that
ISIS somehow resisted the temptation to CamelCase that perfectly
ordinary word.

--
Ryan Cousineau [email hidden] http://www.wiredcola.com/
"I don't want kids who are thinking about going into mathematics
to think that they have to take drugs to succeed." -Paul Erdos

Ryan Cousineau said:

Name an ISIS maker that hasn't moved to an external-bearing crank as
their primary product.

-----------
American Classic.

anyway, I'm not advocating ISIS.... just hoping for a reasonably
durable lightweight BB to use with my spiffy cranks for a couple years
until we see the next big change. Probably end up with the bearing
cups in the cranks themselves!

did you get those 175mm pulsion compacts?! i was eyeballing those!

botfood said:

...to match the stronglight crankset I just got on ebay. 😉

In article <[email hidden]>,

botfood said:

Ryan Cousineau said:

Name an ISIS maker that hasn't moved to an external-bearing crank as
their primary product.

-----------
American Classic.

anyway, I'm not advocating ISIS.... just hoping for a reasonably
durable lightweight BB to use with my spiffy cranks for a couple years
until we see the next big change. Probably end up with the bearing
cups in the cranks themselves!

Hm. That's an interesting idea....

I think you'll be able to buy ISIS stuff for some time, and the NOS
market will continue even after that.

For my part, I have four main bikes. Two run on square-taper spindles,
one has an Octalink BB (Dura-Ace crank and BB acquired cheaply), and the
cross bike has a Giga X Pipe (Truvativ) Crank/BB-set, with an ISIS-like
spline on the non-drive crank, but a non-ISIS crank attachment bolt.

--
Ryan Cousineau [email hidden] http://www.wiredcola.com/
"I don't want kids who are thinking about going into mathematics
to think that they have to take drugs to succeed." -Paul Erdos

In article <[email hidden]>,

Ryan Cousineau said:

As a fan of the English language, I note that internal capitalization
(aka CamelCase) has become so common that in the FSA FAQ, they just
assume "ISIS Overdrive" should be "OverDrive." I am happy to say that
ISIS somehow resisted the temptation to CamelCase that perfectly
ordinary word.

Camel case was always a bad idea. I've had to deal with too much of it.
Underscore characters provide a better effect and is easier to type.

OverDrive
over_drive.

NowIsTheWinterOfOurDiscontent.

now_is_the_winter_of_our_discontent

--
Michael Press