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Dare ya to only watch it once...

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View Poll Results: I watched the CAMBIO OMAC SPORT...
Once
15
60.00%
3 to 5 times
5
20.00%
10 times
1
4.00%
More than 10 times
0
0%
Other
4
16.00%
Voters: 25. You may not vote on this poll

Dare ya to only watch it once...

Old 05-06-21, 02:51 PM
  #1  
chainwhip
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Dare ya to only watch it once...

CAMBIO OMAC SPORT
"In 1947, Italian OMAC company developed a product that can be attached to a popular bicycle".

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Old 05-06-21, 02:53 PM
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Velo Mule
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I'm out. I only looked at the derailleur and the date and there is no way I will only look at this once.
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Old 05-06-21, 02:55 PM
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Wow, I've never seen the likes of that before!

Looks like a more user-friendly version of the Cambio Corsa, operating on the slack side of the chain instead of the taut side as the Corsa does.
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Old 05-06-21, 03:03 PM
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Had one. Cambio corsa works better.

1948 Frejus 004 by iabisdb, on Flickr

1948 Frejus 061 by iabisdb, on Flickr
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Old 05-06-21, 03:05 PM
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Cambio Sport by iabisdb, on Flickr
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Old 05-06-21, 03:13 PM
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Originally Posted by iab View Post
Had one. Cambio corsa works better.
Of course you did!

What were the drawbacks of the OMAC?
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Old 05-06-21, 03:15 PM
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Originally Posted by iab View Post
Had one. Cambio corsa works better.

1948 Frejus 004 by iabisdb, on Flickr

1948 Frejus 061 by iabisdb, on Flickr
iab -

Is "friction" an aspect of keeping the jockey wheel aligned with the selected cog?
If so, is that friction a function of the seat stay clamps holding the lever mech?
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Old 05-06-21, 03:25 PM
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Originally Posted by scarlson View Post
Looks like a more user-friendly version of the Cambio Corsa
Aside from the shift level position, I don't see how it has much similarity to the Cambio Corsa at all. It uses a tensioner instead of wheel movement in the dropout to maintain chain tension, and it uses a pulley instead of a fork for jockeying the chain.

Judging by the geometry in the video, shifting in the small cogs is probably a bit baulky out on the road.
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Old 05-06-21, 03:28 PM
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I'm surprised, but I only watched it once.
It was interesting to see how chain tension was maintained. Seems to do that pretty well.
At a glance, it does seem to put the pulley fairly far from the cogs, so that could make it harder to control the chain's position. Maybe that's why iab prefers the Cambio Corsa?

I'm left wondering why I've never heard of this before (or just forgot?).
... and did it come onto the market before or after the Cambio Corsa?

Steve in Peoria
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Old 05-06-21, 03:33 PM
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Originally Posted by steelbikeguy View Post
I'm left wondering why I've never heard of this before (or just forgot?).
Why would you have heard of it? It's some random weird derailleur design from an era that had a whole lot of weird derailleur designs.

... and did it come onto the market before or after the Cambio Corsa?

1947? Campy had been making Cambio Corsa-esque systems for quite a while at that point.
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Old 05-06-21, 03:51 PM
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Originally Posted by HTupolev View Post
Why would you have heard of it? It's some random weird derailleur design from an era that had a whole lot of weird derailleur designs.
possibly, but it was sufficiently prominent for iab to find a copy in good shape and for someone else to post a video of it.
I don't recall seeing it in my copy of the Dancing Chain, and it's too late to ask Berto if it was an also-ran that wasn't significant enough to include.

Steve in Peoria
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Old 05-06-21, 03:55 PM
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Originally Posted by HTupolev View Post
Aside from the shift level position, I don't see how it has much similarity to the Cambio Corsa at all.
Oh, I've been microdosing the Campy special grease. Brings the mind to a whole new shift level, you start seeing the Cambio Corsa everywhere, in life, in the universe, and in everything.
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Old 05-06-21, 03:59 PM
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Once. Now I want one.

-Kurt
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Old 05-06-21, 03:59 PM
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Originally Posted by jeirvine View Post
Of course you did!

What were the drawbacks of the OMAC?
It didn't shift. I watched most of the video. I have no idea how they made that magic occur. I'd be in the small cog, twisted that sob so it was touching the spokes and the chain wouldn't move. Same in the opposite direction, chain would not move.
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Old 05-06-21, 04:01 PM
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Originally Posted by chainwhip View Post
iab -

Is "friction" an aspect of keeping the jockey wheel aligned with the selected cog?
If so, is that friction a function of the seat stay clamps holding the lever mech?
​​​​​​​Yes to the first question. I don't recall for the second. I sold it over 10 years ago.
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Old 05-06-21, 04:04 PM
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Originally Posted by steelbikeguy View Post
I'm left wondering why I've never heard of this before (or just forgot?).
... and did it come onto the market before or after the Cambio Corsa?

Steve in Peoria
The first ad for a CC was in 1934. I do know Di Paco used one in the 1935 Giro.

As for it being unknown, there are actually quite a few obscure Italian derailleurs from prior to 1953 that never found their way to the Berto book.
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Old 05-06-21, 04:12 PM
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Originally Posted by HTupolev View Post
...
1947? Campy had been making Cambio Corsa-esque systems for quite a while at that point.
is there a good source for the dates of production for the Cambio Corsa?
poking through the Dancing Chain, page 152 mentions 1946 to 1948.
Dave Moulton says it was invented in 1940... Dave Moulton's Blog - Dave Moulton's Bike Blog - The Cambio Corsa: Campagnolo's Early Masterpiece
presumably production was delayed by the war?

edit: must have crossed paths with iab's mention of earlier mentions and uses of the cambio corsa....

another edit... poked around a bit and learned that the concept for the mechanism did evolve in the 30's, but didn't have the Cambio Corsa name. The best summary seems to be from Chuck Schmidt's Campy Timeline at https://www.velo-retro.com/tline.html
here's the relevant text:
[b]1933
After fabricating parts in the backroom of his father's hardware store (Corsa Padova 101, Vincenza), Tullio starts Campagnolo, S.r.l. with the production of the quick release hub. The sliding hub, dual seatstay rod operated, back pedal derailleur (cambio prototype) is patented on May 4th and introduced in August. The pieces of the prototype derailleur are all handmade requiring a massive investment of time and labor. Fratelli Brivio of Brescia (F.B.) becomes the subcontractor for the parts and supplier of the three-piece (steel barrel with aluminum flanges) hubs. Later, the official corporate name becomes Campagnolo Brevetti Internazionali SpA (translation: Campagnolo International Patents Incorporated).

1934
Cambio a bacchetta (translation: rod changer) or Cambio "CAMPAGNOLO" is the name used for sliding hub, dual seatstay rod operated, back pedal derailleur. The slogan becomes "Senza attriti e senza rumore" (i.e., Friction-free and noise-free). The first advertisement for the Cambio "CAMPAGNOLO" appears in Gazzetta dello Sport.

1940
Tullio Campagnolo hires his first fulltime employee, Enrico Piccolo.

<some text removed>

1946
The Cambio Corsa (translation: race changer) is the new name for sliding hub, dual seatstay rod operated, back pedal derailleur; later referred to in Italian as the due leve (translation: two lever) when the una leve (translation: single lever) race changer is introduced in 1949. Two versions of the Cambio Corsa derailleur are available: the short lever Corsa and the long lever Sport. The quick release nut is the original rounded screw head version. On January 12, the Campagnolo winged wheel with quick release logo with the words "Cambio Campagnolo" is registered.

Steve in Peoria

Last edited by steelbikeguy; 05-06-21 at 08:36 PM.
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Old 05-06-21, 04:29 PM
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Originally Posted by steelbikeguy View Post
is there a good source for the dates of production for the Cambio Corsa?
poking through the Dancing Chain, page 152 mentions 1946 to 1948.
Dave Moulton says it was invented in 1940... Dave Moulton's Blog - Dave Moulton's Bike Blog - The Cambio Corsa: Campagnolo's Early Masterpiece
presumably production was delayed by the war?

edit: must have crossed paths with iab's mention of earlier mentions and uses of the cambio corsa....

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CC was invented in 1934. Tulio hired his first employee in 1940, the same year CC was standard issue on the Bianchi Folgore. I have a 1942 Frejus CC and a no later than 1939 Paglianti CC.
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Old 05-07-21, 07:58 AM
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That is so cool; but how many teeth is the chain engaging when on the smallest cog?
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Old 05-07-21, 09:39 AM
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Originally Posted by tiger1964 View Post
That is so cool; but how many teeth is the chain engaging when on the smallest cog?
Probably about as many as a Simplex straight-parallelogram RD when the upper pivot spring is broken.

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Old 05-07-21, 11:05 AM
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Originally Posted by steelbikeguy View Post
poked around a bit and learned that the concept for the mechanism did evolve in the 30's, but didn't have the Cambio Corsa name.
Well, cambio corsa only translates to "race derailleur". It is pretty generic and if you use that term in Italian ebay, you get most everything. I'm not certain about any name being "official".

Most Italians will call it due stecche or due leve, 2 levers.

I have really only discerned 2 versions of it until Campagnolo moved to the 1 lever "Paris Roubaix" derailleur named after Coppi's PR win in 1950(ish?). On the other hand, I have seen at least a dozen iterations of the rear dropouts from the mid-30s to 1946. After teh war, Campagnolo was pretty consistent with what he produced for dropouts and derailleurs.
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Old 05-15-21, 11:37 AM
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I watched the video once, but I will watch it again. It's not every day you see a completely different derailleur idea. Derailleurs with one pulley wheel are notoriously bad at shifting, but if you got two on there, I wonder...

Edit... I watched it again, and then I paused the video and just stared at the thing for a while. Getting the wheel off, to change a tire or something, must be a real PITA.
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Old 05-15-21, 12:25 PM
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So "other" = two, six, seven, eight, or nine viewings (or none at all), making this one of the most randomly broken polls ever. I love it!

Cool video though.
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Old 05-15-21, 04:21 PM
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Originally Posted by rhm View Post
I....
Edit... I watched it again, and then I paused the video and just stared at the thing for a while. Getting the wheel off, to change a tire or something, must be a real PITA.
wow, good point! Hadn't even considered that.

Steve in Peoria
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Old 05-15-21, 05:14 PM
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Originally Posted by iab View Post
It didn't shift. I watched most of the video. I have no idea how they made that magic occur. I'd be in the small cog, twisted that sob so it was touching the spokes and the chain wouldn't move. Same in the opposite direction, chain would not move.
I guess it didn't do shift.
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