Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5
  1. #1
    Survival of the Fitest TheDL's Avatar
    Join Date
    Jul 2004
    Location
    PDX
    My Bikes
    198? Univega Custom Maxima, 2009 Motobecane Fantom Cross Uno
    Posts
    1,559
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Freewheel "knock" ?

    Can a bmx freewheel make a knocking noise if it's going bad?

    I know the noise is not the valve stem washer or my hub out of adjustment. The knock isn't constant though. If I back pedal the cranks with my hand, it's hard to tell, but I think I feel a rough spot. But it could be the chain doing that too. I want to place blame on the freewheel because it's an el-cheapo Dicta, but it hasn't been ridden in any bad weather. The chain is fairly new and I don't think it's the BB because it's fairly new and Ultegra level so I don't think it'd give out on me this early. This is my first BMX freewheel though so I wanted to just ask if it's possible for a freewheel to make that sort of noise.

    Did that make any sense?
    ...take your protein pills and put your helmet on...
    2009 Motobecane Fantom Cross Uno, 1983 Univega Nuovo Sport, GT Team LOTTO
    Looking for GT Course ~ 58cm PM Me!

  2. #2
    fender bender tool boy's Avatar
    Join Date
    Nov 2006
    Location
    St Paul, MN
    Posts
    67
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Cheap freewheels can make all sorts of noises and problems. I like ACS freewheels. They seem to last, come in good sizes, and make a lot of noise when coasting (I like them, the people I ride with don't). If you have the cash, White Industries makes the best freewheel available.

  3. #3
    Always find my way home
    Join Date
    Dec 2005
    Location
    Kankakee, IL
    My Bikes
    Madone, 8500
    Posts
    190
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    "Knocks" can be caused by anything from a dead spot in yer pedal stroke (the freewheel pawls slam when engaging), or maybe youve over-tensioned your chain. Check your chainline, too. Overly tight spots and a bad chainline are likely culprits.
    "Send lawyers, guns, and money"

  4. #4
    Wot no bike? pahearn's Avatar
    Join Date
    May 2006
    Posts
    91
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You have to take the chain off of the freewheel to definitively put the problem sound on the freewheel -- you may be following the wrong path. I'd take the chain off and see if it feels/sounds funny alone, then I'd take a chain whip and use it to apply cranking force on the cog to see if you hear/feel anything weird while the freewheel is being stressed, sans drivetrain.

    EDIT: Another thing, check the tightness of your chainwheel bolts. When they start loosening up they can sound as though you have chain/cog issues, when really the problem is up front.

    -pete

  5. #5
    Survival of the Fitest TheDL's Avatar
    Join Date
    Jul 2004
    Location
    PDX
    My Bikes
    198? Univega Custom Maxima, 2009 Motobecane Fantom Cross Uno
    Posts
    1,559
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thx for the tips guys. I hadn't thought of the chainring bolts pahearn, good call.
    ...take your protein pills and put your helmet on...
    2009 Motobecane Fantom Cross Uno, 1983 Univega Nuovo Sport, GT Team LOTTO
    Looking for GT Course ~ 58cm PM Me!

Posting Permissions

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