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Is my NR RD bent?

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Is my NR RD bent?

Old 05-30-17, 11:08 PM
  #1  
Narhay
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Is my NR RD bent?



Also has some back and forth play at the hanger mounting bolt and a tiny crack next to the Pat '79.

🤔
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Old 05-30-17, 11:27 PM
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Yup, happens quite a bit on high mileage ones.
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Old 05-30-17, 11:31 PM
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Yep. Now the question is, does it make any difference in the shifting?
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Old 05-30-17, 11:56 PM
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Originally Posted by davester View Post
Yep. Now the question is, does it make any difference in the shifting?
That was 'zacktly what I was thinking. Narhay will have to swap in an unbent one to see if theres any difference.

You need to buy another NR RD, Narhay. No two ways about it
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Old 05-31-17, 12:30 AM
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Hmmmmmm.

I did think long and hard about this but ended up committing an act of blasphemy. I'll update the thread maybe tomorrow.
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Old 05-31-17, 05:27 AM
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Originally Posted by Narhay View Post
Hmmmmmm.

I did think long and hard about this but ended up committing an act of blasphemy. I'll update the thread maybe tomorrow.
Oh boy - I sense some Shimano content coming.
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Old 05-31-17, 05:42 AM
  #7  
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I would straighten it.

Or get another NR.
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Old 05-31-17, 08:43 AM
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Bent differently, but reminds me of a unit I won on ebay a number of years ago, "pristine" , well almost, there was a gouge on the back side of the top knuckle, parallelogram was twisted ever so slightly, confirmed with a quick mounting. The gouge lined up with where the dropout would have made contact had the mechanism swung violently backwards.

Contacted seller, explained and return accepted without challenge.
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Old 05-31-17, 09:03 AM
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It'll probably work as well as an un-bent Campy NR RD.
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Old 05-31-17, 09:14 PM
  #10  
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I know a few guys with clean used or NOS NR derailleur parts, if you want to go to the trouble of rebuilding or transplanting. Me, I'd probably go with a clean used piece.
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Old 05-31-17, 10:33 PM
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Originally Posted by nlerner View Post
It'll probably work as well as an un-bent Campy NR RD.
...oh snap.
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Old 05-31-17, 10:59 PM
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Yes, definitely bent. However, is it just me or does the inner portion of the parallelogram not appear bent? If the main body of the RD is still in alignment with the chainline, I wonder if the outer portion of the RD body suffered a lateral impact. I realize nlerner was being sarcastic, but he may not be far off from the truth.

Probably not related, but still curious: Why does the RD show so much damage/scrapes near the dropout, on the inner-most portion of the knuckle, a couple cm immediately out from the hanger? That RD could tell some stories.
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Old 06-01-17, 07:19 AM
  #13  
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I have seen the NR rear derailleur bent a few times, over the years. But, I don't recall ever seeing a Shimano, or Suntour, or Simplex bent in the same fashion. So, my question is, is this unique only to the Campy rear chain hopper? Also...

How would one go about straightening the bent portion? I have an early NR(pre 1969) rear derailleur that could use some straightening and just might give it a try.
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Old 06-01-17, 07:29 AM
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Originally Posted by randyjawa View Post
I have seen the NR rear derailleur bent a few times, over the years. But, I don't recall ever seeing a Shimano, or Suntour, or Simplex bent in the same fashion. So, my question is, is this unique only to the Campy rear chain hopper?
Not exclusive to Campagnolo, but to that particular parallelogram design. I have a Zeus Criterium derailleur with a similar bend.

Suntour, Shimano, and others use U-shaped pieces for their parallelograms, which resist this type of bending better than the flat plates of the Campagnolo design.

How would one go about straightening the bent portion? I have an early NR(pre 1969) rear derailleur that could use some straightening and just might give it a try.
Unless it has adversely affected shifting, I wouldn't bother. My bent Zeus still works fine. I suspect you'd have to disassemble the derailleur to effectively straighten the plate. That's more work than I'm willing to take on.
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Old 06-01-17, 10:03 AM
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Originally Posted by nlerner View Post
It'll probably work as well as an un-bent Campy NR RD.
Yeah, not amazingly well, but hey, it survived. Most other derailleurs would not have.
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Old 06-01-17, 11:06 AM
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Originally Posted by gaucho777 View Post
Yes, definitely bent. However, is it just me or does the inner portion of the parallelogram not appear bent?
I thought that too, but on closer inspection I believe it is--less so than the outer portion, but bent. That being said, as long as the pivot points are still parallel at either end and roughly in the same lateral alignment that they originally were, it should function about as well as it did before. I'd think it would really be twisting that would be the main cause for concern.
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Old 06-01-17, 05:01 PM
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Originally Posted by ecnewell View Post
I thought that too, but on closer inspection I believe it is--less so than the outer portion, but bent. That being said, as long as the pivot points are still parallel at either end and roughly in the same lateral alignment that they originally were, it should function about as well as it did before. I'd think it would really be twisting that would be the main cause for concern.
Agree, but the primary issue is if the axis of the lower pivot is parallel to the hangar bolt and maintains a perpendicular relationship to the freewheel, dropout, and chain line. This also assumes the cage is not twisted or bent.
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Old 06-01-17, 09:03 PM
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I fixed the problem for now... but it may result in some sleepless nights.

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Old 06-01-17, 09:45 PM
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I love it! I fixed the Simplex Delrin rear derailleur by employing the exact same method!
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