Re: Three arm cranksets

Retro Bob said:

I'm not considering the steel ones, but there are some vintage early
designs alloy by Stronglight, TA, and even Campy.

Campy? I never saw one of those. Do you have a link to a picture?

--

David L. Johnson

__o | Become MicroSoft-free forever. Ask me how.
_`\(,_ |
(_)/ (_) |

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In article <[email hidden]>,

Retro Bob said:

David L. Johnson said:

Campy? I never saw one of those. Do you have a link to a picture?

http://www.classicrendezvous.com/Italy/Campagnolo/Campy_cranks.htm

_ That one looks like alloy, but the one that I own is definitely
steel.

_ Booker C. Bense

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Booker C. Bense said:

Quoted message said:

Quoted message said:

Campy? I never saw one of those. Do you have a link to a picture?

http://www.classicrendezvous.com/Italy/Campagnolo/Campy_cranks.htm

_ That one looks like alloy, but the one that I own is definitely steel.

We are getting progressively more esoteric here, but do you mean steel,
three-arm, Campy cranks? I was surprised enough to see the alloy one
above -- never seen one in the flesh.

Lots of 3-arm steel cranks around. I used to have a Magestroni, but there
were several brands. Most probably being used as boat anchors now.

--

David L. Johnson

__o | "It doesn't get any easier, you just go faster." --Greg LeMond
_`\(,_ |
(_)/ (_) |

On Wed, 29 Sep 2004 17:30:02 GMT, Retro Bob <[email hidden]>

Quoted message said:

David L. Johnson said:

Campy? I never saw one of those. Do you have a link to a picture?

http://www.classicrendezvous.com/Italy/Campagnolo/Campy_cranks.htm

That crank set is a beautiful piece of art! Why does the chain ring
tooth profile look so much deeper than for example the teeth on a
Shimano 105 crank set? Does the deep tooth profile increase friction
as the chain engages and disengages the chain ring? My old steel
chain rings have about 30,000 miles on them and I was thinking of
upgrading to a newer crank set. I'm not sure about how long a new
crank set would last or if it would effect chain wear.

Quoted message said:

Quoted message said:

http://www.classicrendezvous.com/Italy/Campagnolo/Campy_cranks.htm

That crank set is a beautiful piece of art! Why does the chain ring
tooth profile look so much deeper than for example the teeth on a
Shimano 105 crank set? Does the deep tooth profile increase friction
as the chain engages and disengages the chain ring? My old steel
chain rings have about 30,000 miles on them and I was thinking of
upgrading to a newer crank set. I'm not sure about how long a new
crank set would last or if it would effect chain wear.

The tooth profile is deeper because those chain rings predate today's
rings which are designed with pins and ramps to improve front shifting.

Careful inspection of modern rings will show that near each ramp several
teeth will have shorter heights; they will look somewhat truncated. The
design supposedly gives a place where it's easier for the chain to jump
over to the next ring.

These changes really do help, to some degree. But I must observe that
older equipment still works fine, once the operator has acquired a
little finesse in their shifting style.

Quoted message said:

Retro Bob said:

I'm not considering the steel ones, but there are some vintage early
designs alloy by Stronglight, TA, and even Campy.

David L. Johnson said:

Campy? I never saw one of those. Do you have a link to a picture?

The beautiful forged steel Campagnolo Gran Sport of
1973~1975. Elegant, slim and shiny chrome, it shared a BB
set with Record (no exclusion grooves as Nuovo Record)

Oddly, Gran Sport cranks came with plain hex head chainring
bolts, not allen fasteners. GS did share with the better

cranks shiny
chromed steel dustcaps with 5mm allen broach.

The 1976 Gran Sport crank became a chunky aluminum 5-arm
with a stamped version of the Nuovo Record 144mm rings. And
a thick aluminum chainring guard to meet the then nascent
CPSC rulings on "protrusions".

IIRC the first version of the 3-arm GS crank had rivetted
chainring 'sets'.

Notably, Campagnolo GS three armed cranks accept the
standard 3-bolt rings from TA, Stronglight et al.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

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In article <[email hidden]>,

David L. Johnson said:

Booker C. Bense said:

Quoted message said:

>Campy? I never saw one of those. Do you have a link to a picture?

http://www.classicrendezvous.com/Italy/Campagnolo/Campy_cranks.htm

_ That one looks like alloy, but the one that I own is definitely steel.

We are getting progressively more esoteric here, but do you mean steel,
three-arm, Campy cranks? I was surprised enough to see the alloy one
above -- never seen one in the flesh.

_ Yes. It's chromed steel and looks a lot like the one
pictured. Very pretty when it's polished, but very heavy.

_ Booker C. Bense

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"David L. Johnson" <[email hidden]> wrote in message news:<[email hidden]>...

Quoted message said:

Retro Bob said:

I'm not considering the steel ones, but there are some vintage early
designs alloy by Stronglight, TA, and even Campy.

Campy? I never saw one of those. Do you have a link to a picture?

Pic of a three arm Campagnolo Grand Sport here (along with lots of other designs):
http://www.bikecult.com/works/chainring.html

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

Quoted message said:

"David L. Johnson" <[email hidden]> wrote in message news:<[email hidden]>...

Quoted message said:

Retro Bob said:

I'm not considering the steel ones, but there are some vintage early
designs alloy by Stronglight, TA, and even Campy.

Campy? I never saw one of those. Do you have a link to a picture?

Pic of a three arm Campagnolo Grand Sport here (along with lots of other designs):
http://www.bikecult.com/works/chainring.html

Wow! Those are really neat! "P.K. Ripper (USA)" had better look out.
Shimongo will sue them for patent infringment for using the latest DA
& XTR design:-)

In article <[email hidden]>,

(John McGraw) said:

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

Quoted message said:

"David L. Johnson" <[email hidden]> wrote in message
news:<[email hidden]>...

Quoted message said:

On Tue, 28 Sep 2004 23:20:42 +0000, Retro Bob wrote:

> I'm not considering the steel ones, but there are some vintage early
> designs alloy by Stronglight, TA, and even Campy.

Campy? I never saw one of those. Do you have a link to a picture?

Pic of a three arm Campagnolo Grand Sport here (along with lots of other
designs):
http://www.bikecult.com/works/chainring.html

Wow! Those are really neat! "P.K. Ripper (USA)" had better look out.
Shimongo will sue them for patent infringment for using the latest DA
& XTR design:-)

It's likely that it took Shimano so long to introduce the pinch-bolt
crank design because they were waiting for the key patents of Bullseye
to expire.

--
Ryan Cousineau, [email hidden] http://www.wiredcola.com
Verus de parvis; verus de magnis.

(John McGraw) said:

Quoted message said:

http://www.bikecult.com/works/chainring.html

Wow! Those are really neat! "P.K. Ripper (USA)" had better look out.
Shimongo will sue them for patent infringment for using the latest DA
& XTR design:-)

I think that's a Redline crank. "PK Ripper" is an aluminum BMX frame
made by SE Racing.

The new Shimano crank design is an appropriation of the Bullseye
design, whose patent expired shortly before the XTR version went into
production. Just like with the patented Suntour slant pantograph
derailleur, Shimano chose to wait it out rather than license another
firm's design.

http://www.bikepro.com/products/cranks/bullseye.html
http://www.singlespeed.net/cranks.htm

Chalo Colina