Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5
  1. #1
    Senior Member
    Join Date
    Sep 2013
    Posts
    138
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Ultregra RD pulleys

    I am working on my Ultrega RD and I found the pulley closest to the cassette does not turn very freely. My other pulley I can spin it a few revolutions before it stops. The one closest to the cassette with the ceramic bearing and rubber cups which set into the pulley won't spin. It also does not seem to be centered in the cage. Not sure if it should be.

    I am thinking I may be missing some washers/spacers. I could not find a diagram showing if it has pulleys with it. Also what oil should I be using on these pulleys? Thanks

  2. #2
    Andrew R Stewart Andrew R Stewart's Avatar
    Join Date
    Feb 2012
    Location
    Rochester, NY
    My Bikes
    Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder
    Posts
    4,601
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It is a common service to take the pulleys apart and clean then lube the bearing/bushing. The tight spin could be grit in there of maybe seals that are dry or twisted. (The seal has a "U" shape cross section with the open side toward the outside.) As to the pulley's not being centered, maybe what you are seeing is the pulley sitting at one end of it's end play. The upper pulley has a bit of free play, side to side, to allow for slight corrections of SIS system off tolerances. Andy.

  3. #3
    Senior Member GeneO's Avatar
    Join Date
    May 2010
    Location
    Chicagoland
    My Bikes
    Felt F55X
    Posts
    762
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    That jockey wheel has an o-ring and the other does not. It is meant to move a bit more freely axially to keep the chain aligned - I don't think it turns as freely, or needs to. I have also had the o-rings get misshapen and slip out.
    Last edited by GeneO; 08-18-14 at 08:30 PM.
    2012 Felt F55X

  4. #4
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    25,406
    Mentioned
    118 Post(s)
    Tagged
    1 Thread(s)
    Pulleys have very little rotational inertia and so it takes very little (very, very, very little) friction to have them seem like they don't spin. If they're old, you might clean and oil them, but otherwise seal drag will have them acting sluggish. (compare throwing a baseball and wiffle ball, into a high wind, which goes farther).
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  5. #5
    Senior Member
    Join Date
    Sep 2013
    Posts
    138
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for the info folks. I checked and it doesn't have much if any side to side play. The U-shaped rubber seals are turned the right way and the ridged washer thing which sits inside the rubber U seems to be where it should be. I suspect you are correct a lot of the lack of spinning may be the outside washer thing making contact with the rubber U.

Posting Permissions

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