Creaking BB / Cassette??

RidwarePhil
RidwarePhil Posts: 102
edited June 2008 in Workshop
Over the last few weeks my bike has developed a fairly load creak / knocking nose when I pedal hard after a period of free wheeling i.e. sprinting out of corners etc

After the initial knock it seems to go away until the next corner etc when it does it again.

GIven that I am out of the saddle I am guessing that its not the saddle / post combo and more likely to be the bb or freewheel.

Any ideas?
Must try harder..........

Comments

  • billybiker
    billybiker Posts: 272
    Hi Phil,

    I would try the obvious first. Tighten the peddles, check the BB is tight, clean and lube the peddles and just check all the rear wheel spokers ar tight.
    www.withamwheelers.co.uk
  • stueyc
    stueyc Posts: 518
    same on my bianchi...

    had the seat off and post..still there..changed pedals..still there
    new chainset...still there..loosened and retightened qr's..still there
    lbs removed bb..said no damage....refitted....still there!!!!!!

    new bb?????
  • billybiker
    billybiker Posts: 272
    Some frame/BB conbinations seem prone to squeaking.
    www.withamwheelers.co.uk
  • stueyc
    stueyc Posts: 518
    its the second via nirone ive had with the same problemand it seems the same kind of noise

    .....any advice to rectify??
  • marco67
    marco67 Posts: 91
    I recently had this problem with my BH L60 carbon frame. Lost count of the times I checked the bottom bracket and pedals - in the end I re greased the headset and the creaking went away! :?
    Ciao Marco
  • RidwarePhil
    RidwarePhil Posts: 102
    This is not so much a creak. Its more of a sudden knock as you power down.

    Just been out and tried to make it happed and I cant.

    Only seems to happen after a period of coasting.

    Might try swapping my wheels over to make sure its not freehun related before I started the greasing process.
    Must try harder..........
  • Ramanujan
    Ramanujan Posts: 352
    happened to me after using my bike on a turbo for a few weeks.
    Ended up being the back wheel hub.
    Swap the back wheel and see if it still does it.
  • stueyc
    stueyc Posts: 518
    my noise only occurs when im out of saddle increasing pressure on pedals...could this still be rear wheel?
  • Ramanujan
    Ramanujan Posts: 352
    it was for me.
    Just try another wheel in there and see what happens.

    Oh... and report back :D
  • dombo6
    dombo6 Posts: 582
    I had similar problem. Tried all the usual suspects, replaced cassette, chain, tightened chainring bolts, greased seatpost and dropouts, BB threads.

    My LBS (GBCycles) eventually discovered the factory (Easton) hadn't put enough grease in the freehub on my new EA90 SLXs. Stripped and regreased, free of charge, voilá, noise gone.

    Bike now as silent as a silent thing being silent in a vacuum.

    Moral of story - check everything that moves and never underestimate the value of your local bike shop.
  • brownbosh
    brownbosh Posts: 602
    When i had that on my via nereone it was a tiny split in the seat post. Also many of that model come with a nasty cheap bb and front chainset combo. Worth looking at.
    As a final note ive just returned one of my CR1 frames on warranty for similar problem. Mine was the alu cup that sits inside the bb area of the carbon frame slightly unseated and therefore impossible to fix!
  • stueyc
    stueyc Posts: 518
    got new chainset and bb fitted today..lbs took out bb and it is far from good quality
    £25 notes later and its as smooth as my babies 8 week old ass!
  • dbb
    dbb Posts: 323
    Dombo6 wrote:
    I had similar problem. Tried all the usual suspects, replaced cassette, chain, tightened chainring bolts, greased seatpost and dropouts, BB threads.

    My LBS (GBCycles) eventually discovered the factory (Easton) hadn't put enough grease in the freehub on my new EA90 SLXs. Stripped and regreased, free of charge, voilá, noise gone.

    Bike now as silent as a silent thing being silent in a vacuum.

    Moral of story - check everything that moves and never underestimate the value of your local bike shop.

    moral of the story
    don't underestimate the value of a diligent and thorough bike mechanic. some really care about what they do and will track down a problem. others will just look for the easy solution and want to keep replacing parts.
    regards,
    dbb

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