Advertise on Bikeforums.net



User Tag List

Results 1 to 4 of 4
  1. #1
    Newbie
    Join Date
    Dec 2008
    Posts
    3
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Chain rides up on lower jockey wheel

    I just finished restoring a 70’s vintage bicycle. While testing and adjusting the campy nuovo record rear derailleur I noticed that in the small to small gear combination the chain tends to ride-up on the lower jockey wheel against the inside of the cage and occasionally it catches in there. I’m not planning to use this gear combination but I’m sure that I will inadvertently shift into it so I think I need to fix this. I’m running 39-52 in front and 14-26 in back, the chainline is pretty much right-on, the dropouts are square with the bottom bracket with the wheel centered, and the chain length looks right (I used Sheldon Brown’s instructions and there’s no slack in small to small and I can shift into large to large). The derailleur does have some play that puts it a little out of square opposite to the chain angle in small to small but it doesn’t seem excessive. I’m not sure what to do here. Any ideas?

    Thanks, Tim

  2. #2
    Old fart JohnDThompson's Avatar
    Join Date
    Nov 2004
    Location
    Appleton WI
    My Bikes
    Several, mostly not name brands.
    Posts
    11,842
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Did you check the derailleur tab alignment?

  3. #3
    Senior Member bikeman715's Avatar
    Join Date
    Mar 2008
    Location
    Salinas , Ca.
    My Bikes
    Bike Nashbar AL-1 ,Raligh M50 , Schwinn Traveler , and others
    Posts
    1,918
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    the dérailleur's pulleys may be warn and need replacing.check the teeth on them.

  4. #4
    Newbie
    Join Date
    Dec 2008
    Posts
    3
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Thanks

    Thanks for responding. This derailleur doesn't have a tab adjustment so I can't do anything there but the jokey wheels may be worn so that is something I can try. Also, thinking about it, more tension on the chain does seem to help so I'll try backing out the dropout adjustment screws.

    Thanks again,

    Tim

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •