Advertise on Bikeforums.net



User Tag List

Results 1 to 4 of 4
  1. #1
    Junior Member Schwinn_Guy's Avatar
    Join Date
    Nov 2009
    Location
    Vancouver, WA
    My Bikes
    Gravity Avenue C 43 cm
    Posts
    10
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Whistling/rubbing sound

    So every time the rear wheel makes a rotation, a sound that strongly resembles brake rub emanates from what I think is the hub. I've triple checked that the brakes weren't rubbing, and removed the fender to rule out the possibility of fender rub on the tire.

    Also, a strange knocking sound can be heard when the rear wheel is spun slowly, as if there were rocks tumbling around inside the hub.

    Are these sounds related, and what can I do to eliminate them?
    Our arrows will blot out the sun!

    Then we will fight in the shade.

  2. #2
    Senior Member oldbobcat's Avatar
    Join Date
    Jul 2005
    Location
    Boulder County, CO
    My Bikes
    '79 Gios, '80 Masi, '06 Felt, early '60s Frejus
    Posts
    2,455
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The whistling sound might a rubber seal over the end of the bearing that rubs against the outside of the hub shell. If your hub has such seals, fold them back and insert a drop of light oil, such as Tri-flow or Boeshield T-9.

    The knocking sounds like it might be a bad bearing, either in the main hub or the freewheel section. Does the wheel wobble sideways when you put pressure on a side of the rim? Does the knock appear only when coasting or under power? The sounds have different causes, but they both may warrant replacement of the hubs or wheels.

  3. #3
    Mechanic/Tourist
    Join Date
    Apr 2007
    Location
    Syracuse, NY
    My Bikes
    2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
    Posts
    4,687
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    The knocking sound probably is bearings - does not necessarily indicate damage but most often indicates too little grease, or grease that has broken down. Overhaul the hub, lubricate the seals and then check for any remaining noises.

  4. #4
    I have senior moments... bikinfool's Avatar
    Join Date
    Oct 2008
    Location
    Woodside, CA
    My Bikes
    Many
    Posts
    2,153
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Another possible cause of the rear wheel's noise could be a loose bit of metal from the rim manufacturing process, although that'd probably be more of a tick tick kind of sound. If in the hub I'd suspect the freehub if the hub bearings are already properly adjusted.
    suum quique
    Mountain bikes: Santa Cruz Hecklers (99, 02, 07), Santa Cruz Nomad, Moots YBB, Trek OCLV Pro Issue, American Breezer
    Road bikes: TST, Trek 2300 (Carbon/Alum)

Posting Permissions

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