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  1. #1
    Senior Member godspiral's Avatar
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    RD or cassette is whistling

    I have a trek 470 which may have extremely few miles on it, even though rims are worn from defective brake pads. The components are all RSX.

    There is a metalic whistling sound when turning the cranks even with no load (front or back). It appears to be comming from the cassette/RD area. It started today, and seemed to go away when down and upshifting. It doesn't seem to go away anymore. I've tried Heavy lubing. The RD seems lined up with the cog.

    Does the RD need tension adjustment?

  2. #2
    suitcase of courage VegasCyclist's Avatar
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    if the bike doesn't hesitate when shifting, then the tension is correct for the RD.

    I'm not sure what a metalic whistling sounds like (anyone listen to Car Talk where they make people imitate the sound their car makes? ) but it could be that the rollers for the pulleys in the RD are dry and need lube. have you tried lubing them and also the pivot points of the RD?
    -VegasCyclist
    "Daddy made whiskey and he made it well.... cost two dollars and it burned like hell...."
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  3. #3
    Senior Member godspiral's Avatar
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    lubing where the pully wheels spin? ... so chain lube would do nothing for that?
    whistling = very high pitch whine...

    P.S. sound occurs even on slow crank movement, and doesnt get higher pitch with faster turning.

  4. #4
    Senior Member godspiral's Avatar
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    Thanks so much, Vegas...
    It was indeed the RD cogs... gotta love that shimano lube in a syringe.

  5. #5
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    Quote Originally Posted by VegasCyclist
    if the bike doesn't hesitate when shifting, then the tension is correct for the RD.

    (anyone listen to Car Talk where they make people imitate the sound their car makes?
    Click and Clack the Tappit brothers? You bet. Best show on NPR.

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