Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    Senior Member
    Join Date
    May 2003
    Location
    So Cal
    Posts
    73
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    rear derailler spring tension

    Hi, I've been reading and posting some here lately, and I need to know if the small screw on the back of a Deore rear derailler adjusts the spring tension. I turned it in pretty far and I'm not sure what it does, but it looks like it moves the whole derailler backwards. What I want to do is get less chain slap on the chain stay and I thought this might tighten up and put more tension on the chain. :confused:

  2. #2
    Senior Member mechBgon's Avatar
    Join Date
    Jul 2002
    Posts
    6,958
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    That one adjusts the tension of the upper pivot spring, and counterbalances the spring that tensions the lower arm (the lower arm has the derailleur pulleys on it). Boosting its tension should increase the chain tension slightly, but its primary function is to rotate the derailleur back far enough to keep the top derailleur pulley from reaching through the chain links and going "bump-bump-bump" against the teeth of your largest cog.

  3. #3
    Senior Member
    Join Date
    Feb 2002
    Location
    St. Paul, MN, USA
    Posts
    98
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You can increase the tension on the cage, but as mentioned above, the lower spring opposes the upper spring. See Derailleur Overhaul

    After changing spring holes in the lower cage, you will need to tighten the upper screw (B-screw). If the upper pulley rubs, you will need to go back to the original set up.

  4. #4
    Senior Member
    Join Date
    May 2003
    Location
    So Cal
    Posts
    73
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    thanks Calvin and mechBgon. I changed the spring hole tonite and got it all put back together, also shortened my chain by a couple of links. The pulley clears OK so I think it will work. It feels stiffer, but I won't know till tomorrow when I get a chance to do my local trails. Ain't working on bikes fun!

  5. #5
    NOT a weight weenie Hunter's Avatar
    Join Date
    Dec 2000
    Posts
    1,762
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You could always add a chain tensioner there are many to choose from, The Kore chain reactor is the least expensive of all of them and looks less of a DH mod than the rest.

  6. #6
    Senior Member
    Join Date
    May 2003
    Location
    So Cal
    Posts
    73
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Its quiet a bit quieter now, actually noise free going off curbs and small stuff. Thanks again.
    Most people are about as happy as they choose to be. Abe Lincoln

Posting Permissions

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