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Any Idea what could be causing this noise?

Discussion in 'The Shop' started by kuksul08, Nov 18, 2008.

  1. kuksul08

    kuksul08 Monkey

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    http://www.vimeo.com/2274556

    I bought a new chainring to hopefully fix it because it's the last thing I can think of. So far I have:
    -rebuilt BB
    -greased crank interface
    -greased pedal interface and tried different pedals
    -greased chainring bolts
    -rebuilt pivots
     

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  2. jjym

    jjym Chimp

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    Maybe check out both derailleurs and the chainring is not hitting the front one under torque. Make sure your rear wheel is seated well too. Also check for a tight link in your chain. Wriggle your crankset hard back and forth for any play. Turn upside down and pedal to see if it makes the sound to a lesser degree.
     
  3. sanjuro

    sanjuro Tube Smuggler

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    Check the derailleur hanger bolt. People miss that one.
     
  4. kuksul08

    kuksul08 Monkey

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    There's no play in the crankset. I don't have a front derailleur so it couldn't be that. It's ONLY when I pedal hard, and not dependent on the chain or cassette position. Der hangar bolts are tight as is the axle.

    I was able to rotate he chainring with respect to the crank holes (by 90 degrees), and suddenly it only clicked when I pedaled with the left crank. This leads me to believe it's in that area.

    I tried different chainring bolts, and some spacers also but to no avail. I will update when the new chainring comes but sheesh IDK how that could be causing it.
     
  5. sanjuro

    sanjuro Tube Smuggler

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    I would replace the BB.

    Rebuilding a sealed bearing BB sounds wrong.
     
  6. kuksul08

    kuksul08 Monkey

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    sorry, by rebuilding I meant taking it out and checking it, then replacing it in the BB shell with grease. The bearings inside were butter.
     
  7. dhspeedster

    dhspeedster Chimp

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    I've pulled BB's out in the past for them to feel smooth as silk yet that can easily betray a cracked race or ball (and has done so very effectively for me - cue lots of cursing).
     
  8. kuksul08

    kuksul08 Monkey

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    So... I got the new chainring in the mail surprisingly fast from Price Point. It's a dangerboy 34T... damn this thing is BEEF and high quality. Threw it on and the noise is 100% gone. FINALLY

    I am trashing the old one and all the misery it cost me now
     
  9. sstalder5

    sstalder5 Turbo Monkey

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    my fr rig makes the exact same noise but i haven really messed with it because i'm replacing my bb and cranks to run a single ring w/chainguide soon but im glad when i replace it that stupid sund will go away. you never know how annoying it can be until your bike starts making that noise
     
  10. pee dot one

    pee dot one Chimp

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    Pull out BB, clean threads on BB/inside shell on frame. Wrap BB threads in teflon tape, 2 or 3 layers. Grease outside of tape layer, grease shell threads on frame. Reinsert BB slowly, to avoid cross threading.
     
  11. kuksul08

    kuksul08 Monkey

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    I do this exact process already :biggrin: I used to only use grease but then the non-drive side cup started backing out during a ride, so the teflon tape increases the resistance and it has been flawless since.
     
  12. oldfart

    oldfart Turbo Monkey

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    Often a bb or other bearing will feel smooth while turning it in your fingers. Notice how you only get the creak when you pedal hard? You can't load a bearing like that with your fingers. While it could be other things suggested I think the bb is toast. That's what I hear anyway. ISIS bb?

    What make of chainring and is it compatible with the crank? I had an ICON (Trek house brand) crank a few years back that had a bolt pattern that was compatible with Shimano, but the Shimano XT mid ring was not compatible. Kind of a long shot but it's all I can think of at the moment. Other than a cracked frame or crank but I assume you have elliminated these possibilities already.