Campagnolo Icarus MTB Crank
James Thomson
for the outer chainring, and a splined attachment for the two smaller
chainrings.
http://www.matuzmaster.hu/kepek/crank_campa_icarus_1.jpg
http://www.matuzmaster.hu/kepek/crank_campa_icarus_2.jpg
Questions:
The lockring that secures the splined chainrings is missing. I'd like to
know the Campag spec for the original in order to find an alternative. A
French (35x1mm) bottom bracket lockring is close.
Am I right in thinking that the splined fitting for the two smaller
chainrings is the same as Campagnolo's 8-speed cassette spline?
Does anyone know the recommended bottom bracket dimensions?
Thanks,
James Thomson
M-gineering
> I've just bought a Campagnolo Icarus MTB crankset with a 110mm bolt circle
> for the outer chainring, and a splined attachment for the two smaller
> chainrings.
>
>
> Thanks,
>
> James Thomson
>
>
--
---
Marten Gerritsen
INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl
Qui si parla Campagnolo
James Thomson wrote:
> I've just bought a Campagnolo Icarus MTB crankset with a 110mm bolt circle
> for the outer chainring, and a splined attachment for the two smaller
> chainrings.
>
> http://www.matuzmaster.hu/kepek/crank_campa_icarus_1.jpg
>
> http://www.matuzmaster.hu/kepek/crank_campa_icarus_2.jpg
>
> Questions:
>
> The lockring that secures the splined chainrings is missing. I'd like to
> know the Campag spec for the original in order to find an alternative. A
> French (35x1mm) bottom bracket lockring is close.
It's the same as an English BB lockring(cup and ball BB). In the 1993
catalog, same part number as the English BB lockring-7203003..so any
steel BB lockring would work fine.
>
> Am I right in thinking that the splined fitting for the two smaller
> chainrings is the same as Campagnolo's 8-speed cassette spline?
That is correct, very ahead of it's time.
>
> Does anyone know the recommended bottom bracket dimensions?
111mm, ISO taper, just like the road BB of the time. NICE crank
>
> Thanks,
>
> James Thomson
James Thomson
> It's the same as an English BB lockring(cup and ball BB). In the 1993
> catalog, same part number as the English BB lockring-7203003..so
> any steel BB lockring would work fine.
The BSC lockring I'd tried (a Specialités TA) wouldn't thread on: perhaps it
was a little undersized. A SunTour works fine.
I don't suppose there's enough thread there to support a track sprocket...
Thanks, Marten and Peter.
James Thomson
A Muzi
The crank lockring is Campagnolo #7203003 which is also a 34.85 (
1.370"x24) BSC Chorus BB lockring , not 35mm!!
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971
russell...@yahoo.com
Probably not enough threading to get a 4th cog and the lockring onto
the crank. Ala Mountain Tamer or da Vinci. But if the spline pattern
is 8 speed Campagnolo, then you could use cogs from an 8 speed
Campagnolo cassette. Might have to try various size spacers to get the
rings spaced right. 12-23 and 13-26 cassettes are readily available.
Maybe try 44 outer, 26 middle, 14 inner. That ought to be low enough.
Or you could put any 110mm bcd ring on the outer. A 34 maybe and then
23 middle and 13 inner. Only problem would be getting the front
derailleur low enough.
James Thomson
> Probably not enough threading to get a 4th cog and the lockring
> onto the crank.
The 4th cog would replace the lockring.
It was just an idle thought, not really something I plan to do. There are
only 4mm of thread, weakened by the splines that pass through them. I don't
think it's viable.
James Thomson
Scott Gordo
I don't have an answer for you, but thanks for posting those pics. I
remember reading about that gruppo (and Browning electronic shifting),
but never got close enough to one to see that the chainrings attached
via a spline. That's a new one on me. Interesting stuff!
/s
russell...@yahoo.com
You did write track cog. I missed that. But not sure why having 4
cogs would be preferable to 3. More duplication of tiny gears? By
using 8 speed Campagnolo cassette cogs amd spacers along with the 44,
32, and 22 rings you already have, you can get ranges of gears from
high to medium to unbelievably low. A 13 tooth inner ring, if its
possible for the front derailleur to work with this, and a 32 or 34
rear cog and you have about 10 gear inches. What would a 4th track cog
add? High, medium, unbelievably low, and really unbelievably low.
Hank Wirtz
Wouldn't the threading be the wrong direction anyway? I mean, you could
thread it on, but pedaling would unscrew it, if it was on the front.
Hank Wirtz
Never mind...I forgot that the cog would be facing the BB, not the
outside of the bike.
A Muzi
>>> Probably not enough threading to get a 4th cog and the lockring
>>> onto the crank.
> James Thomson wrote:
>> The 4th cog would replace the lockring.
>> It was just an idle thought, not really something I plan to do. There are
>> only 4mm of thread, weakened by the splines that pass through them. I don't
>> think it's viable.
russell...@yahoo.com wrote:
> You did write track cog. I missed that. But not sure why having 4
> cogs would be preferable to 3. More duplication of tiny gears? By
> using 8 speed Campagnolo cassette cogs amd spacers along with the 44,
> 32, and 22 rings you already have, you can get ranges of gears from
> high to medium to unbelievably low. A 13 tooth inner ring, if its
> possible for the front derailleur to work with this, and a 32 or 34
> rear cog and you have about 10 gear inches. What would a 4th track cog
> add? High, medium, unbelievably low, and really unbelievably low.
Yeah, but oh!, the possibilities!
How about muddy offroading with a race block?
A 13 front/21 rear is a low gear of what, 16?
A Muzi
>>> Probably not enough threading to get a 4th cog and the lockring
>>> onto the crank.
>> The 4th cog would replace the lockring.
> James Thomson wrote:
>> It was just an idle thought, not really something I plan to do. There are
>> only 4mm of thread, weakened by the splines that pass through them. I don't
>> think it's viable.
Hank Wirtz wrote:
> Wouldn't the threading be the wrong direction anyway? I mean, you could
> thread it on, but pedaling would unscrew it, if it was on the front.
He's right.
The Record OR/Icarus RH thread would tighten a cog there, assuming you
want a cog there.
David L. Johnson
> James Thomson wrote:
>> I've just bought a Campagnolo Icarus MTB crankset with a 110mm bolt circle
>> for the outer chainring, and a splined attachment for the two smaller
>> chainrings.
>>
>> http://www.matuzmaster.hu/kepek/crank_campa_icarus_1.jpg
Pretty.
>> Am I right in thinking that the splined fitting for the two smaller
>> chainrings is the same as Campagnolo's 8-speed cassette spline?
I believe this is true. I have a large sprocket, 30 teeth, that I had
bought as an 8-speed cassette sprocket, but was told that it went to their
MTB cranks. It doesn't look as cool as the pics, though. The sprocket is
flatter and plainer.
BTW, I still have the sprocket, but no longer have any 8-speed wheels.
You want it?
--
David L. Johnson
"What am I on? I'm on my bike, six hours a day, busting my ass. What
are you on?" --Lance Armstrong
David L. Johnson
> Wouldn't the threading be the wrong direction anyway? I mean, you could
> thread it on, but pedaling would unscrew it, if it was on the front.
No, it wouldn't, since it is on the inside.
--
David L. Johnson
As far as the laws of mathematics refer to reality, they are not
certain, and as far as they are certain, they do not refer to reality.
-- Albert Einstein
James Thomson
> BTW, I still have the sprocket, but no longer have any 8-speed wheels.
> You want it?
Gladly. I'll drop you a mail.
James Thomson
dvt
That cog would be *really* tough to remove if you ever wanted to do so.
You'd have a lot of torque tightening that cog onto the crank.
After writing that, it occurs to me that a partial thread (as implied by
James) and really high torque is a bad idea. Especially if the threads
are aluminum.
--
Dave
dvt at psu dot edu
Everyone confesses that exertion which brings out all the powers of body
and mind is the best thing for us; but most people do all they can to
get rid of it, and as a general rule nobody does much more than
circumstances drive them to do. -Harriet Beecher Stowe, abolitionist and
novelist (1811-1896)
JeffWills
On Jan 23, 3:52 pm, A Muzi <a...@yellowjersey.org> wrote:
> How about muddy offroading with a race block?
> A 13 front/21 rear is a low gear of what, 16?
I think the Icarus crank would be a good match for a Surly Pugsley:
http://www.surlybikes.com/pugsley.html
Monsterbike mud-bogging! I figure a 10-inch low gear should allow me to
pull a stuck 4x4 out of the muck.
(FWIW: I'll ignore the posiibility that a 100mm width, Campy-taper BB
may not exist.)
Jeff
russell...@yahoo.com
> On Jan 23, 3:52 pm, A Muzi <a...@yellowjersey.org> wrote:
>
> > How about muddy offroading with a race block?
> Monsterbike mud-bogging! I figure a 10-inch low gear should allow me to
> pull a stuck 4x4 out of the muck.
>
> (FWIW: I'll ignore the posiibility that a 100mm width, Campy-taper BB
> may not exist.)
>
> Jeff
103 mm Record and Chorus are available right now. Close enough. They
are asymmetric I think. Or Phil Wood will make you whatever length
bottom bracket with Campagnolo taper you want. Symmetric or asymmetric.
James Thomson
> 103 mm Record and Chorus are available right now.
Jeff's talking about the shell, not the axle.
James Thomson