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Will a 1972 Campagnolo Record RD accept a 28t rear cog?

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Will a 1972 Campagnolo Record RD accept a 28t rear cog?

Old 11-27-09, 09:43 AM
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Barrettscv 
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Will a 1972 Campagnolo Record RD accept a 28t rear cog?

I'm considering a 13-28 five speed freewheel to be used with a 1972 Campagnolo Record rear Derailer. I'll be using a 49 & 45t chainrings. Does this RD have the capacity to accept a 28t cog?

The bike is a 1972 Schwinn Paramount that now has the OEM 14-26 freewheel.

Thanks
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Old 11-27-09, 10:37 AM
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according to Velobase the max tooth is 26t.
http://velobase.com/ViewSingleCompon...=108&AbsPos=33
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Old 11-27-09, 10:49 AM
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Thank you, Bianchigirll
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Old 11-27-09, 10:53 AM
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Check with Kurt (Cudak888). I thought he was able to get a Nuovo Record to work with a 28t. I think he had a thread about it.
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Old 11-27-09, 10:54 AM
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Originally Posted by Barrettscv View Post
Thank you, Bianchigirll

I'm running 28's on my International and Competition. However, I had to pull the wheel all the way to the back of the drop outs. Works perfect.

Scott
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Old 11-27-09, 11:10 AM
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I'm going to use a 14-26 six speed freewheel. I'll use 52 & 49t chainrings for my flat rides near home, and install a 45 & 42t chainrings for hilly rides.

I considered a 13-28 five speed with 49 & 45t chainrings. This would work for most rides without changing chainrings, but the above solution should be better if not easier.

Michael

Last edited by Barrettscv; 11-27-09 at 11:15 AM.
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Old 11-27-09, 11:19 AM
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I looked into this as well and apparently 28 is reachable if you:

1. push the axle all the way back in the horizontal dropouts as mentioned by Scottryder,
2. make the chain as short as you can while still allowing for cross chaining.

There are a few experts out there on this subject.

You can also put a 42 or 41 t chaining ring onto a Record Strada crank as well to get better range with the 26.
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Old 11-27-09, 02:51 PM
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I concur with the prevailing sentiment -- with half-step up front and the rear wheel pushed all the way back, you should be able to make it work, but you'll have to pay attention to chain length. 49-45 / 13-28 should make a nice half-step. The other way to play it is 1.5-step, e.g. 52-42 / 15-17-19-22-25, which the derailleur can handle with aplomb.
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Old 11-27-09, 03:37 PM
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As previously stated, the factory specification for maximum cog size is 26T. It is not uncommon for manufacturers to list conservative figures to avoid potential issues. So, it is not surprising that Berto found it capable of handling 28T. Beside the derailluer itself, the other factor that plays a big part is the drop of the dropout itself, that is the distance from the axle slot to the derailleur mounting hole. The Campagnolo 1010/B dropout has the shortest drop and using other dropouts with a larger drop may increase the large cog capacity.

While moving the axle farther back in dropout will is a solution, it does have a drawback. The Nuovo Record derailleur which is already noted for late shifting, will require even more overshift to execute a gear change.
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Old 11-27-09, 05:12 PM
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My first good road bike back in 1975, an ItalVega Nuovo Record, came with 52-42 chainrings & 14-28 5 speed freewheel. The axle was probably in the middle of the dropout, and I never had any trouble with the Campy NR deraillers, although I don't remember using the large cog/large ring combo much.
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Old 11-27-09, 05:38 PM
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I've run that derailleur with a 52/42 in front and 14-28 in back. No problem.
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Old 11-27-09, 06:04 PM
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Mike, you can see the controversy brewing already.

I've tried this, and I prefer to keep NRs at 24 teeth and below, due to overshift issues.
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Old 11-27-09, 06:17 PM
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I would say that the need or desire to go with a 28 trumps the "need" for that model der. AS some've stated, the N.R. ders. weren't so forgiving, other(s) maintain that it'll work. I'm not convinced that it will based solely on my not being convinced of their perf. under any circumstances with them much less pushing their limit. One member sess THAT my way. Mine shifts OK or shall I say ok
You have it so try it. Sounds obvious but if it should fail, simply get a later C- Record type. Late 87 -on which weren't always part of an indexed group, they DO work and like the olde N.Rs are spec'd for 26t.
They don't cost much used, I've used them on set-ups I prefer not to explain... versatile in friction.
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Old 11-27-09, 06:32 PM
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Originally Posted by old and new View Post
I would say that the need or desire to go with a 28 trumps the "need" for that model der. AS some've stated, the N.R. ders. weren't so forgiving, other(s) maintain that it'll work. I'm not convinced that it will based solely on my not being convinced of their perf. under any circumstances with them much less pushing their limit. One member sess THAT my way. Mine shifts OK or shall I say ok
You have it so try it. Sounds obvious but if it should fail, simply get a later C- Record type. Late 87 -on which weren't always part of an indexed group, they DO work and like the olde N.Rs are spec'd for 26t.
They don't cost much used, I've used them on set-ups I prefer not to explain... versatile in friction.
My wife and I are running 7spd 14-28 + friction shifting, her with a 1st gen Chorus and mine with a 1st gen Athena, without any fuss or special setup at all.
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Old 11-27-09, 07:04 PM
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Originally Posted by Road Fan View Post
Mike, you can see the controversy brewing already.

I've tried this, and I prefer to keep NRs at 24 teeth and below, due to overshift issues.
Originally Posted by old and new View Post
I would say that the need or desire to go with a 28 trumps the "need" for that model der. AS some've stated, the N.R. ders. weren't so forgiving, other(s) maintain that it'll work. I'm not convinced that it will based solely on my not being convinced of their perf. under any circumstances with them much less pushing their limit. One member sess THAT my way. Mine shifts OK or shall I say ok
You have it so try it. Sounds obvious but if it should fail, simply get a later C- Record type. Late 87 -on which weren't always part of an indexed group, they DO work and like the olde N.Rs are spec'd for 26t.
They don't cost much used, I've used them on set-ups I prefer not to explain... versatile in friction.
Hi everyone,

One of my self-imposed constraints is that I would like to keep the bike close to original while making a few key improvements that keep it on the road.

I'm willing to change a few things: The bike came with 27 inch tubulars, it now has 700c clinchers. The upgrade from a five speed to a six speed does not change the look much while improving the gear spacing.

But I am unwilling to make all the upgrades that I could make. I'll keep the 120mm dropout spacing. I'll keep the crankset and derailers.

I have a modern bike with a 3 x 10 drivetrain that has been built up from the frame with personally selected components and specifications to fulfill every possible use.

The older bike is my retro ride.

Michael
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Old 11-27-09, 07:40 PM
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There's a retro rear derailleur that will shift extremely well with any gearing that you throw at it, and that is the Huret Duopar or the Sachs-Huret Eco Duopar. 28 is no problem and 36 is no problem. Schwinn may not have spec'd them for touring, but Trek did, in the early '80s 720 model.

Some of us use the Campy Rallye on Paramounts, I think pastorbob did that. But that is nowhere near the shifter that the Duopar is.
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Old 11-27-09, 09:45 PM
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I've used an NR with a 13-31 rear and an 8-tooth difference in the chainrings - rear wheel all the way back, but no problem using all gears.
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