Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    Waiting for his CX YungBurke's Avatar
    Join Date
    Jul 2008
    Location
    Atlanta, Georgia; Lewisburg Pennsyvania
    My Bikes
    Jamis Satellite, Motobecane Fantom Cross UNO, Fuji Team singlespeed
    Posts
    453
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Strange Drivetrain noise/ behavior

    Hey guys I have a puzzler. My drivetrain has been behaving very strangely. Whenever I put any kind of power down, there is this strange grinding noise which comes from the casette area. Also, periodically the chain will feel like it slips for about 1/4 of a chainring revolution. I replaced the chain, oiled, and adjusted the rear derailleur and the slipping is less prounouced, but the grinding and some slip is still present. It occurs on every chain ring and there doesnt look like any "shark fin" action on any of the rings. One thing I have noticed is the derailleur seems to not rotate as freely and will sometimes seem to get caught and rise up towards the chainstay slightly. It also isnt as effective at holding the chain on the right cog when backpedalling. The cage looks like it may be bent, and I am investigating a replacement now, but does this seem consistent with the symptoms?
    Revised Stable:
    2008 Jamis Satellite- Fast road, racing, club rides, touring
    2009 Motobecane Fantom CX UNO- singletrack, fire roads, touring, urban riding
    1982 Fuji Team Singlespeed- dad's ride, coffee shop, screwing about

  2. #2
    Senior Member
    Join Date
    Feb 2009
    Location
    Austin, TX
    My Bikes
    Giant XTC Team Custom XC bike, Nashbar tourer custom commuter
    Posts
    209
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Could it be a problem with the ratchet mechanism in the freehub?

  3. #3
    Waiting for his CX YungBurke's Avatar
    Join Date
    Jul 2008
    Location
    Atlanta, Georgia; Lewisburg Pennsyvania
    My Bikes
    Jamis Satellite, Motobecane Fantom Cross UNO, Fuji Team singlespeed
    Posts
    453
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by DaJMasta View Post
    Could it be a problem with the ratchet mechanism in the freehub?
    This is definitely a possibility. I may have bent the axle at some point or another, there is a very slight "wobble" in the cassette if you freewheel quickly. The only thing is this phenomenon has existed for a while without the above issue, and the wobble may just be an illusion of the shift ramp pattern since its only perceptable at high rpm.
    Revised Stable:
    2008 Jamis Satellite- Fast road, racing, club rides, touring
    2009 Motobecane Fantom CX UNO- singletrack, fire roads, touring, urban riding
    1982 Fuji Team Singlespeed- dad's ride, coffee shop, screwing about

  4. #4
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    26,139
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)
    A new chain on a used cassette will frequently cause skipping.

    Also, check the new chain for a tight link. Pedal backwards slowly and watch the chain as it exits the lower rd pulley. A tight link will cause a kink in the chain at that point that is obvious.

  5. #5
    Great State of Varmint Panthers007's Avatar
    Join Date
    Sep 2008
    Location
    Dante's Third Ring
    Posts
    7,481
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    I'd overhaul the freehub. Sounds like it might need new pawls, or something.

    Good luck.
    How do you keep an idiot in suspense?

  6. #6
    Waiting for his CX YungBurke's Avatar
    Join Date
    Jul 2008
    Location
    Atlanta, Georgia; Lewisburg Pennsyvania
    My Bikes
    Jamis Satellite, Motobecane Fantom Cross UNO, Fuji Team singlespeed
    Posts
    453
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by HillRider View Post
    A new chain on a used cassette will frequently cause skipping.

    Also, check the new chain for a tight link. Pedal backwards slowly and watch the chain as it exits the lower rd pulley. A tight link will cause a kink in the chain at that point that is obvious.
    Yeah, im familiar with this this, but the problem got a bit better with a new chain. Also, no tight links on the chain, and the skipping only occurs under moderately heavy pedaling/ accelerating.
    Revised Stable:
    2008 Jamis Satellite- Fast road, racing, club rides, touring
    2009 Motobecane Fantom CX UNO- singletrack, fire roads, touring, urban riding
    1982 Fuji Team Singlespeed- dad's ride, coffee shop, screwing about

Posting Permissions

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