Bearings inside crankarm? stationary axle?

Quoted message said:

I was reading a discussion thread about in vs. outboard bearings,
Italian vs. ISO threading, and someone mentioned the idea of using a
fixed BB axle with the bearings pressed into the crankarms instead of
the whole external bearing mish-mash we have currently with racing
bikes today... I'm only thinking of this because I bought an old stupid
Klein with the non-threaded non-standard pressed-in style BB w/ 35mm OD
bearings 17mm ID, and have been trying to think of some other ways to
make it work... http://www.reset-racing.de sells new Shimano Hollowtech
II style press-in cups for 99 Euros...

so, does anyone recall cranks being made with bearings actually pressed
in the crank?

The Klein bottom bracket works just fine. By "make it work" you must mean
something other than make it work, because there's just plain nothing wrong with
the way your bike was built in the first place. The bearings are fairly standard
and there are good bike shops all over that can replace them. Phil Wood has
spindles and bearings. Given the choice between the Klein design and anything
Shimano's done in years, I'll take the Klein for reliability, quality and class.

All that aside, if you dislike the Klein for being unusual, why "correct" that
by doing something downright weird?

Ron

Mark R Beattie said:

I was reading a discussion thread about in vs. outboard bearings,
Italian vs. ISO threading, and someone mentioned the idea of using a
fixed BB axle with the bearings pressed into the crankarms instead
of the whole external bearing mish-mash we have currently with
racing bikes today... I'm only thinking of this because I bought an
old stupid Klein with the non-threaded non-standard pressed-in style
BB w/ 35mm OD bearings 17mm ID, and have been trying to think of
some other ways to make it work... http://www.reset-racing.de sells
new Shimano Hollowtech II style press-in cups for 99 Euros...

Quoted message said:

so, does anyone recall cranks being made with bearings actually
pressed in the crank?

I don't understand how this Kline bottle type BB is to work. On what
does the bearing run and what rotates? If the cranks rotate then so
must the axle in order to transmit motion from one to the other.

http://www.mathemagic.org/MOBM/moebiusmolecules.html

Jobst Brandt

<[email hidden]> wrote: I don't understand how this Kline
bottle type BB is to work. On what does the bearing run and what rotates?
If the cranks rotate then so must the axle in order to transmit motion from
one to the other.
^^^^^^^^^^^^^^^^^^
Think "out of the bottle," Jobst. It could be done by having a chain ring
on each side. Two chains would run on two cogsets in back, which would
synchronize the pedals. As long as the two deraileurs always shifted
exactly together, I can't see any problem. <G>

<[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

I was reading a discussion thread about in vs. outboard bearings,
Italian vs. ISO threading, and someone mentioned the idea of using a
fixed BB axle with the bearings pressed into the crankarms instead of
the whole external bearing mish-mash we have currently with racing
bikes today... I'm only thinking of this because I bought an old stupid
Klein with the non-threaded non-standard pressed-in style BB w/ 35mm OD
bearings 17mm ID, and have been trying to think of some other ways to
make it work... http://www.reset-racing.de sells new Shimano Hollowtech
II style press-in cups for 99 Euros...

so, does anyone recall cranks being made with bearings actually pressed
in the crank?

-Mark Beattie
Astoria, NY

How would the arms stay synched? Or would they spin independently of the
other? I don't see THAT being a good thing, but maybe the marketers could
think of a good way to pitch it.

-Hank

Hank Wirtz said:

<[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

I was reading a discussion thread about in vs. outboard bearings,
Italian vs. ISO threading, and someone mentioned the idea of using a
fixed BB axle with the bearings pressed into the crankarms instead of
the whole external bearing mish-mash we have currently with racing
bikes today... I'm only thinking of this because I bought an old stupid
Klein with the non-threaded non-standard pressed-in style BB w/ 35mm OD
bearings 17mm ID, and have been trying to think of some other ways to
make it work... http://www.reset-racing.de sells new Shimano Hollowtech
II style press-in cups for 99 Euros...

so, does anyone recall cranks being made with bearings actually pressed
in the crank?

-Mark Beattie
Astoria, NY

How would the arms stay synched? Or would they spin independently of the
other? I don't see THAT being a good thing, but maybe the marketers could
think of a good way to pitch it.

-Hank

http://www.powercranks.com/about/concept.htm

Are exactly as you describe, with each side spinning independently. As
they see it, it is a good thing! I'd like to try, but they are quite
expensive.

Joseph

Leo Lichtman said:

<[email hidden]> wrote: I don't understand how this Kline
bottle type BB is to work. On what does the bearing run and what rotates?
If the cranks rotate then so must the axle in order to transmit motion from
one to the other.
^^^^^^^^^^^^^^^^^^
Think "out of the bottle," Jobst. It could be done by having a chain ring
on each side. Two chains would run on two cogsets in back, which would
synchronize the pedals. As long as the two deraileurs always shifted
exactly together, I can't see any problem. <G>

Has to be a fixie, though, and *that* creates a problem with the ders.

Alternately, mount a small jackshaft on the downtube and run a short
chain to it from a small identical-size sprocket on each crank, or
place a pair of gears under the BB meshing with a crown gear on each
crank to transmit the left crank's motion to the right crank.

None of these ideas is as potentially useful as simply employing an
Ashtabula-size BB shell and fitting a bigger bearing than is possible
with the current threaded BB shells. This change would allow larger
hollow axle diameters and larger bearings without the need for
cumbersome outboard assemblies and costly proprietary bearings at all.
It will never be used in the road and mountain bike market, however,
because it's doubtless viewed as BMX tech, and BMX is for kids...
--
Typoes are a feature, not a bug.
Some gardening required to reply via email.
Words processed in a facility that contains nuts.

Quoted message said:

Hank Wirtz said:

<[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

I was reading a discussion thread about in vs. outboard bearings,
Italian vs. ISO threading, and someone mentioned the idea of using a
fixed BB axle with the bearings pressed into the crankarms instead of
the whole external bearing mish-mash we have currently with racing
bikes today... I'm only thinking of this because I bought an old stupid
Klein with the non-threaded non-standard pressed-in style BB w/ 35mm OD
bearings 17mm ID, and have been trying to think of some other ways to
make it work... http://www.reset-racing.de sells new Shimano Hollowtech
II style press-in cups for 99 Euros...

so, does anyone recall cranks being made with bearings actually pressed
in the crank?

-Mark Beattie
Astoria, NY

How would the arms stay synched? Or would they spin independently of the
other? I don't see THAT being a good thing, but maybe the marketers could
think of a good way to pitch it.

-Hank

http://www.powercranks.com/about/concept.htm

Are exactly as you describe, with each side spinning independently. As
they see it, it is a good thing! I'd like to try, but they are quite
expensive.

Good thing? Hardly! Try them sometime.

Besides, they still use a rotating axle, as they must in order to
transmit the power from left to right and connect to the chain. A
fixed axle would be just a support, and in order for it to be used
with a pair of cranks that were mechanically connected without the use
of a 90-degree drive or external power transmission path of some sort,
the axle would need to have a mounting point outboard of the cranks
themselves on each side, thereby precluding rotation of the cranks
through a full circle.

This is one of the most basic "you can't get there from here" concepts
in design.
--
Typoes are a feature, not a bug.
Some gardening required to reply via email.
Words processed in a facility that contains nuts.

Werehatrack said:

Quoted message said:

Hank Wirtz wrote:
....
http://www.powercranks.com/about/concept.htm

Are exactly as you describe, with each side spinning independently. As
they see it, it is a good thing! I'd like to try, but they are quite
expensive.

Good thing? Hardly! Try them sometime....

Is riding with PowerCranks worse than re-reading this thread in its
entirety:
<http://groups.google.com/group/rec.bicycles.tech/browse_frm/thread/1cb202dcec87725/370e73a664d795c9?q=day+coggan&rnum=3#370e73a664d795c9>?
😉

--
Tom Sherman - Fox River Valley (For a bit)

Werehatrack said:

Quoted message said:

Hank Wirtz said:

<[email hidden]> wrote in message
news:[email hidden]...
>I was reading a discussion thread about in vs. outboard bearings,
> Italian vs. ISO threading, and someone mentioned the idea of using a
> fixed BB axle with the bearings pressed into the crankarms instead of
> the whole external bearing mish-mash we have currently with racing
> bikes today... I'm only thinking of this because I bought an old stupid
> Klein with the non-threaded non-standard pressed-in style BB w/ 35mm OD
> bearings 17mm ID, and have been trying to think of some other ways to
> make it work... http://www.reset-racing.de sells new Shimano Hollowtech
> II style press-in cups for 99 Euros...
>
> so, does anyone recall cranks being made with bearings actually pressed
> in the crank?
>
> -Mark Beattie
> Astoria, NY
>

How would the arms stay synched? Or would they spin independently of the
other? I don't see THAT being a good thing, but maybe the marketers could
think of a good way to pitch it.

-Hank

http://www.powercranks.com/about/concept.htm

Are exactly as you describe, with each side spinning independently. As
they see it, it is a good thing! I'd like to try, but they are quite
expensive.

Good thing? Hardly! Try them sometime.

Besides, they still use a rotating axle, as they must in order to
transmit the power from left to right and connect to the chain. A
fixed axle would be just a support, and in order for it to be used
with a pair of cranks that were mechanically connected without the use
of a 90-degree drive or external power transmission path of some sort,
the axle would need to have a mounting point outboard of the cranks
themselves on each side, thereby precluding rotation of the cranks
through a full circle.

This is one of the most basic "you can't get there from here" concepts
in design.

I didn't catch that it had to be a fixie! Since we are already on the
subject of crazy things, you could use powercranks on a fixed gear by
flipping one of the arms around and mounting it inside-out. That way
you get one leg for "Go!" and the other for "Whoa!"

Or your could spend the $800 on some sort of drive shaft setup with a
differential in the middle of the BB so that one leg could rotate X
rpm, while the other could rotate 2X, or one leg could even go the
other way!

Joseph

<[email hidden]> wrote: (clip) or one leg could even go the
other way!
^^^^^^^^^^^^^^^
This thread is beginning to sound a little silly.

Leo Lichtman said:

<[email hidden]> wrote: (clip) or one leg could even go the
other way!
^^^^^^^^^^^^^^^
This thread is beginning to sound a little silly.

I quite agree. Stop that, all of you. No one enjoys a good joke any
more than I do...no, wait, actually everyone enjoys a good joke more
than I do, but this is getting entirely too silly, so we will now move
on to the Next Thread.

Not so fast; in an orderly manner, now...To The Next Thread!

jobst.brandt said:

I don't understand how this Kline bottle type BB is to work.

Umm, that would be a Klein bottle, named after German mathematician Felix
Klein. I'm surprised at you, Jobst. But maybe you got that spelling from
the web page you indicated, where the same mistake occurs.

--

David L. Johnson

__o | You will say Christ saith this and the apostles say this; but
_`\(,_ | what canst thou say? -- George Fox.
(_)/ (_) |

In article <[email hidden]>, Inspector

Leopard of the Yard () said:

Leo Lichtman said:

<[email hidden]> wrote: (clip) or one leg could even go the
other way!
^^^^^^^^^^^^^^^
This thread is beginning to sound a little silly.

I quite agree. Stop that, all of you. No one enjoys a good joke any
more than I do...no, wait, actually everyone enjoys a good joke more
than I do, but this is getting entirely too silly, so we will now move
on to the Next Thread.

Not so fast; in an orderly manner, now...To The Next Thread!

There's never a Python policeman around when you need one, is there?

--
Dave Larrington - <http://www.legslarry.beerdrinkers.co.uk/>
Pepperoni and green peppers, mushrooms, olives, chives!

Leo Lichtman said:

<[email hidden]> wrote: I don't understand how this Kline
bottle type BB is to work. On what does the bearing run and what rotates?
If the cranks rotate then so must the axle in order to transmit motion from
one to the other.
^^^^^^^^^^^^^^^^^^
Think "out of the bottle," Jobst. It could be done by having a chain ring
on each side. Two chains would run on two cogsets in back, which would
synchronize the pedals. As long as the two deraileurs always shifted
exactly together, I can't see any problem. <G>

Only one chain, formed into a Moebius strip. (They have their own
problems -like, which side do you lube?)

"Brian Huntley" wrote: Only one chain, formed into a Moebius strip. (They
have their own problems -like, which side do you lube?)
^^^^^^^^^^^^^^^
You must be an old fart, like me. When I was a kid, I recall an big old
irrigation pump, driven by a flat belt, which actually WAS spliced into a
Moebius strip, to equalize the wear on both sides (or was it one side?)

Quoted message said:

jobst.brandt said:

I don't understand how this Kline bottle type BB is to work.

David L. Johnson said:

Umm, that would be a Klein bottle, named after German mathematician Felix
Klein. I'm surprised at you, Jobst. But maybe you got that spelling from
the web page you indicated, where the same mistake occurs.

Darn. I thought that was a purposeful bit of humor from
Jobst. Klein Bottle BBs, road course by Escher, etc.

--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

Dave Larrington said:

In article <[email hidden]>, Inspector

Leopard of the Yard () said:

Leo Lichtman said:

<[email hidden]> wrote: (clip) or one leg could even go the
other way!
^^^^^^^^^^^^^^^
This thread is beginning to sound a little silly.

I quite agree. Stop that, all of you. No one enjoys a good joke any
more than I do...no, wait, actually everyone enjoys a good joke more
than I do, but this is getting entirely too silly, so we will now move
on to the Next Thread.

Not so fast; in an orderly manner, now...To The Next Thread!

There's never a Python policeman around when you need one, is there?

The Spanish Inquisition might unexpectedly show up.

--
Tom Sherman - Fox River Valley

In article
<[email hidden]>,

Johnny Sunset said:

Dave Larrington said:

In article <[email hidden]>, Inspector

Leopard of the Yard () said:

On Tue, 24 Jan 2006 16:51:13 GMT, "Leo Lichtman"
<[email hidden]> wrote:

>
><[email hidden]> wrote: (clip) or one leg could even go the
>other way!
>^^^^^^^^^^^^^^^
>This thread is beginning to sound a little silly.

I quite agree. Stop that, all of you. No one enjoys a good joke any
more than I do...no, wait, actually everyone enjoys a good joke more
than I do, but this is getting entirely too silly, so we will now move
on to the Next Thread.

Not so fast; in an orderly manner, now...To The Next Thread!

There's never a Python policeman around when you need one, is there?

The Spanish Inquisition might unexpectedly show up.

Now we are expecting it.

--
Michael Press

Leo Lichtman said:

"Brian Huntley" wrote: Only one chain, formed into a Moebius strip. (They
have their own problems -like, which side do you lube?)
^^^^^^^^^^^^^^^
You must be an old fart, like me. When I was a kid, I recall an big old
irrigation pump, driven by a flat belt, which actually WAS spliced into a
Moebius strip, to equalize the wear on both sides (or was it one side?)

Guilty as charged.

I always thought it was to equalize wear on the edges, not the sides,
as the old flat belts used to bump up against one flange (if run on a
flanged wheel, natually.) I remember seeing old steam-driven traction
engines (no, I'm not that old that they were in daily use) that used
convex wheels for their PTOs, but they took a lot of tending, unlike a
pump that would be left out on its own.