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Thread: Dura Ace Cassette Rumble..

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    Default Dura Ace Cassette Rumble..

    Was hoping someone could help out with this...
    Just set up a bike with all new DA7800.
    I have two new wheelsets, and each has a new DA cassette, one is 12-21, the other 12-23.
    The DA chain is new as well.
    I am finding that the 12-21 is giving a loud rumbling noise while turning the pedals, and I can easily feel it through the cranks (when turning by hand). Rumbling and resistance.
    The wheel with the 12-23 is not as bad, but I notice a little.
    The limits are set properly, and the shifting is tuned up and working well.
    Help!
     

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    tighten the lockring to spec?
     

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    Default

    oil the chain
    make sure its not off the der pulleys
     

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    Default

    Thanks for the replies. Lockring is tight. And the wheel is new, and I made sure the freehub (mavic) was properly lubed.
    The chain is new, so I was just leaving the factory oil (or whatever it is) on there, as I've not had issues in the past, but I'll try cleaning it tonight and applying a good amount of regular chain oil.
    I assume the only thing to adjust for the pulleys is the small screw on the back....Ill have a look.
    thx!
     

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    Do you have both spacers behind the cassette?
     

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    Default

    Call me crazy...did you by mistake use a 9 spd. chain?

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    Default

    Swap cassettes and make sure it's not the wheel bearings? Is one of the cogs on backwards? I did that once when I spilled the cassette over the workbench didn't shift well and made a funny noise. Good puzzle for the real mechanics on board. Frank
    Frank Beshears

    The gentlest thing in the world
    overcomes the hardest thing in the world.

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    you cant put the cogs on backwards these days.

    just get a new bike and start over.
    easiest thing
     

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    Default

    steve's right.

    start with a new bike, and upgrade to 7900.
     

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    Default

    The crank/rings are new (DA 7800).
    Chain is DA 10 speed.
    Both spacers are behind the cassette.

    Thanks again, will try all the suggestions tonight.
     

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    one more...

    take a rubber mallet to Pucci's head.

    It won't fix your problem but you will feel better.

    then go out and buy SRAM.
    "make the break"

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    Default

    I had a spacer in the incorrect place on mine and it made a noise.... Lockring was tight.

    A spacer or a reversed cog sounds like it could be the culprit....I have done both and had to take it to the shop for my reminder of how I can mess up mechanicals.....


    Let us know what it finally turns out to be...

    ps- I even put a 12 tooth lock ring on an 11 tooth cassette YEP more noise...
     

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    Yeah. what they all said.

    It sounds to me like a cassette that is loose on the hub or that the hub itself has issues.

    Dave
    D. Kirk
    Kirk Frameworks Co.
    www.kirkframeworks.com


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    Default had this when i swapped cassette and chain...

    if I remember it was in 50/12 only.

    I think the chain, being new, did not perfectly match with the chainring that already had 1000 miles on it. There was some kind of interference pattern this created and caused a low rumble while pedaling in that gear. It went away after the chain broke in.
     

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    Steve is evil. So is Roman.

    When troubleshooting, first thing's first: eliminate the variables. This is true whether you are fixing a radar, a toaster or a bicycle.

    Try the cassette in question on the wheel that you that right now has the cassette that is operating normally. If you get the same rumble, then you have identified that the problem lies with the cassette and not the wheel. If no problem on the new wheel, try the "good" cassette on the other wheel, if it rumbles, it's the wheel. Keep it simple, and go step by step.

    It's a logic thing.

    Capische?


    CaptStash....
     

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    The cassette wasn't tight.

    Holy f*ck I feel like an idiot....:embarassed:

    I also put some real lube on the chain which helped...
     

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    Quote Originally Posted by oldguy00 View Post
    The cassette wasn't tight.

    Holy f*ck I feel like an idiot....:embarassed:

    I also put some real lube on the chain which helped...
    HA!!! Drop and give me 10!!! Glad this worked out, I hate that.

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    Quote Originally Posted by oldguy00 View Post
    The cassette wasn't tight.

    Holy f*ck I feel like an idiot....:embarassed:

    I also put some real lube on the chain which helped...
    Naa, how do you think we came up with our ideas, it's sort of a been there and done that too sort of thing :>).
    Frank Beshears

    The gentlest thing in the world
    overcomes the hardest thing in the world.

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    Quote Originally Posted by Roman View Post
    tighten the lockring to spec?
    what do I win?
     

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    Quote Originally Posted by Roman View Post
    what do I win?
    a free membership to the weight weenies forum
    :thumbs_up:
     

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