Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Campy SR rear derailleur alignment ?

Notices
Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Campy SR rear derailleur alignment ?

Old 04-02-22, 08:55 PM
  #1  
75lechamp 
Full Member
Thread Starter
 
Join Date: Feb 2014
Location: Arvada, Colorado
Posts: 227

Bikes: 1975 Motobecane LeChampion (silver lilac), 1974 Motobecane Grand Jubile (red/black); 1975 Motobecane Team Champion (orange); 1982 Pinarello Professional (Exorcist Green); 1974 Raleigh Professional MkIV mink blue, 1974 Motobecane Grand Record blk/red

Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 59 Post(s)
Liked 407 Times in 113 Posts
Campy SR rear derailleur alignment ?

I have been trying to get my recent build set up, but having some trouble with the rear derailleur, which is a `82 Campy Super Record. This is on a Raleigh Team 753 bike with a brand new freewheel. Here is how it looks pretty much across the cluster:




As you can see, the chain wants to consistently skip to the outside of the bottom pulley. To control for variables, I have tried it with a different chain, as well as a different derailleur (Nuovo Record), it seems to consistently do this. I did a quick check with a derailleur alignment gauge, and it seemed close enough, but now I am wondering if that might be it. This is a frame that was recently repaired (chain stay replaced), so wondering if the derailleur hanger is out? Any thoughts would be appreciated....

Thanks,

Andy
75lechamp is online now  
Old 04-02-22, 09:39 PM
  #2  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 16,595

Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Srewart 650B ATB

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3580 Post(s)
Liked 2,437 Times in 1,546 Posts
Are you willing to sub a non Campy part onto your bike? Try a different brand pulley. Another possible solution is to use a file to bevel the pulley teeth on one side.

Campy NR era pulleys don't have much tooth height and with current chains and their reduced side plate dimensions the pulley teeth and chain links don't have much engagement overlap. So the chain more easily rides up and over the teeth with the cage side plate being the limit. I'll bet this only happens on some of the more chain angled combos. The cage alignment can sometimes be the big reason. If the cage isn't aligned WRT the length of the bike axis it will worsen the chain ride up. Depending on the ft and back chain lines, the chain stay length, the cog set width, the chain design, the pullet teeth shape and the der cage alignment (in all 3 axis) this ride up can be more or less. Andy
__________________
AndrewRStewart
Andrew R Stewart is offline  
Old 04-03-22, 03:49 AM
  #3  
TiHabanero
Senior Member
 
Join Date: Nov 2012
Posts: 3,849
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 1437 Post(s)
Liked 902 Times in 474 Posts
I have seen this many times with rear derailleurs that are damaged. Usually it is cage alignment where the jockey wheels are not in the same plane or the wheels are out of plane with the rest of the drive train. Recheck hanger alignment as well. Andy's suggestion of changing jockey wheels may help.
TiHabanero is offline  
Old 04-03-22, 06:03 AM
  #4  
75lechamp 
Full Member
Thread Starter
 
Join Date: Feb 2014
Location: Arvada, Colorado
Posts: 227

Bikes: 1975 Motobecane LeChampion (silver lilac), 1974 Motobecane Grand Jubile (red/black); 1975 Motobecane Team Champion (orange); 1982 Pinarello Professional (Exorcist Green); 1974 Raleigh Professional MkIV mink blue, 1974 Motobecane Grand Record blk/red

Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 59 Post(s)
Liked 407 Times in 113 Posts
thanks guys, I will try some new non-Campy pulleys
75lechamp is online now  
Old 04-03-22, 08:07 PM
  #5  
Mad Honk 
Senior Member
 
Join Date: May 2019
Location: Bloomington, IN
Posts: 1,995

Bikes: Schwinn Paramounts, Othon Ochsner, Masi, Faggin

Mentioned: 66 Post(s)
Tagged: 0 Thread(s)
Quoted: 834 Post(s)
Liked 885 Times in 607 Posts
From here in the cheap seats I am with T-habs, the hanger is bent inward so check the alignment of the hanger. Smiles, MH
Mad Honk is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.