Advertise on Bikeforums.net



User Tag List

Results 1 to 4 of 4

Thread: chain rub

  1. #1
    Hills! speedlever's Avatar
    Join Date
    Aug 2005
    Location
    Rolling hills of Piedmont NC
    My Bikes
    2008 Trek Madone 5.5, 2006 Trek Pilot 5.2 (deceased), 2005 Marin Novato, Trek 7100, Schwinn Frontier, Trek 800 sport, Trek 220, Trek MT 60
    Posts
    874
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    chain rub

    Just started this morning.. and I can't find where it's rubbing. I hear the scriiiitch... scriiitch sound and feel it when I'm cranking on the LH downstroke. That's the only time I hear/feel it. Easy riding and it is silent.

    When I shift from the small chainring to the mid chainring, no noise. From the mid to the large chainring, no noise. But when I shift from the large to the mid chainring and put some power in the downstroke, there it is again in its irritating glory. Doesn't seem to matter what gear the rear cassette is in.

    I can't find anywhere it's rubbing. It won't do it when I'm watching it in a stand. Have to put some power in it to create the noise. Crank bolts are tight. Everything looks good. But something's amiss.

    Any suggestions what to look for?

  2. #2
    Senior Member
    Join Date
    Nov 2007
    Posts
    219
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You may want to check the front derailleur, I would guess particularly the inside portion of it? If you find rubbing there, adjust the cable tension and lubricate the front derailleur hinges

  3. #3
    Hills! speedlever's Avatar
    Join Date
    Aug 2005
    Location
    Rolling hills of Piedmont NC
    My Bikes
    2008 Trek Madone 5.5, 2006 Trek Pilot 5.2 (deceased), 2005 Marin Novato, Trek 7100, Schwinn Frontier, Trek 800 sport, Trek 220, Trek MT 60
    Posts
    874
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Yep. Turned out to be the front DR. Was a bit low such that when cranking on the LH pedal, caused the chain to rub.

  4. #4
    Elitist Troglodyte DMF's Avatar
    Join Date
    Jun 2006
    Location
    Dallas
    My Bikes
    03 Raleigh Professional (steel)
    Posts
    6,887
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Let me state for the record (this being an election year) my belief that chain rub is better than <shudder> knob rub.

Posting Permissions

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