This here rattling noise.................?

JimmyK
JimmyK Posts: 712
edited August 2008 in Workshop
you know the kind of sound when your chain is just rattling against a derrailleur.

Im getting that kind of sound and thought my derraillure needed adjusted. strange thing is, you hear it very audibly when im riding over poor road surfaces , but when i ride over freshly tarmac`ed road ................it goes away :?:

so when i ride around the coast where some of the condition of the roads is dire, its clatterring away merrily and when i hit the smooth stuff..............silence.

im not technically minded at all, can any of you guys suggest what you think i should get done to fix it. bike is an 8 speed , double front ring trek 1000 with sora shifters.
cheers

jimmyk

Comments

  • kmahony
    kmahony Posts: 380
    Could be many things. I had something similar that turned out to be the inside of the seat post. Fixed by applying lots of grease to the post and inside of the frame.
    http://2008etape.blogspot.com/
  • JimmyK
    JimmyK Posts: 712
    seat post !!

    gosh that never even occurred to me.

    jimmyk
  • MIsterGoof
    MIsterGoof Posts: 128
    bottle cage?
    false teeth?
    shrapnel wound?
    ....
  • JimmyK
    JimmyK Posts: 712
    bottle cage is taken off the bike

    jimmyk
  • salsarider79
    salsarider79 Posts: 828
    Chain on Chainstays? If you have lots of oily marks on your frame, thats your problem...
    jedster wrote:
    Just off to contemplate my own mortality and inevitable descent into decrepedness.
    FCN 3 or 4 on road depending on clothing
    FCN 8 off road because I'm too old to go racing around.
  • JimmyK
    JimmyK Posts: 712
    salsarider79 wrote:
    Chain on Chainstays? If you have lots of oily marks on your frame, thats your problem...


    what does this mean, dont even know what a chain stay is :oops:

    jimmyk
  • shmo
    shmo Posts: 321
    Does it only make the noise when you're pedalling?
  • JimmyK
    JimmyK Posts: 712
    Shmo wrote:
    Does it only make the noise when you're pedalling?


    no, if i freewheel over rough road surface it does it too. silent if i freewheel on smooth.

    jimmyk
  • Monty Dog
    Monty Dog Posts: 20,614
    Could be a number of things: Have your crashed the bike - the rear mech hanger could be bent and the chain rubbing the derailleur cage? The mech jockey wheels are so worn that the chain is skipping off and running against the cage. Examine your drivetrain carefully - lift the rear wheel and turn the pedals slowly and watch the chain as it runs over the cassette in different gear combos to try and spot the problems.
    Make mine an Italian, with Campagnolo on the side..
  • topdude
    topdude Posts: 1,557
    How about a nice simple case of rear brake cable rattling against the underside of the top tube, or gear cables rattling against the underside of the down tube. I fitted some 'o' rings to mine in both places and now have silence. :D
    He is not the messiah, he is a very naughty boy !!
  • killiekosmos
    killiekosmos Posts: 772
    Do you wear a watch with a metal strap? Mine rattles when I go over rough surfaces?
    Be nice to grumpy old men (or else!)
  • JimmyK
    JimmyK Posts: 712
    killiekosmos wrote:
    Do you wear a watch with a metal strap? Mine rattles when I go over rough surfaces?



    no i dont wear a watch

    jimmyk
  • downfader
    downfader Posts: 3,686
    Hi there Jimmy!

    I get this too! Mine I have found is a mixture of the chain being a little too slack (apparently you can have different tensions set up with different amounts of links) and the road surface making the chain bounce up and down onto the actual frame itself. Mine goes loverly and quiet too on even surfaces (like through the common here) :)
  • JimmyK
    JimmyK Posts: 712
    downfader wrote:
    Hi there Jimmy!

    I get this too! Mine I have found is a mixture of the chain being a little too slack (apparently you can have different tensions set up with different amounts of links) and the road surface making the chain bounce up and down onto the actual frame itself. Mine goes loverly and quiet too on even surfaces (like through the common here) :)




    have you sorted yours out , or just left it ?

    jimmyk
  • downfader
    downfader Posts: 3,686
    JimmyK wrote:
    downfader wrote:
    Hi there Jimmy!

    I get this too! Mine I have found is a mixture of the chain being a little too slack (apparently you can have different tensions set up with different amounts of links) and the road surface making the chain bounce up and down onto the actual frame itself. Mine goes loverly and quiet too on even surfaces (like through the common here) :)




    have you sorted yours out , or just left it ?

    jimmyk

    I just left mine tbh. Its too much hassle to shorten the chain as I think you have to change the rear sprocket to match. I actually changed my routes in and out of work too to avoid such a rattle and potential damage to the bike.

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