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  1. #1
    AmiableNitrite Member VonCarlos's Avatar
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    Trouble with my balls slapping !

    I opened up a 1981 Campy Grand Sport read hub to change the bearings and replace the grease and discovered a bad cone. I wasn't able to find a replacement GS cone but was able to find Record cones. Problem is, that the GS and Record cones have a different profile and use different size bearings.
    The GS cone is more shallow and uses a smaller bearing.
    The Record cone is more concave and uses a bigger bearing.
    I did a lot of internet and forum searching to see if swapping was possible, but found no definitive answer.
    So I used the Record cones and larger bearings but left the original cups in the GS hubs.
    Problem is, I can now hear the bearings slapping into each other. I believe I have the bearings adjusted correctly.
    No play with skewer tightened and wheel spins freely: a little play with skewer loose.
    Anyone have some knowledge on this?

  2. #2
    AmiableNitrite Member VonCarlos's Avatar
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    Opps, I made a mistake here, the front hub bearings are different sizes but the rear hub uses the same 1/4 inch bearings.
    Still have the bearing slap noise.

    Quote Originally Posted by VonCarlos View Post
    I opened up a 1981 Campy Grand Sport read hub to change the bearings and replace the grease and discovered a bad cone. I wasn't able to find a replacement GS cone but was able to find Record cones. Problem is, that the GS and Record cones have a different profile and use different size bearings.
    The GS cone is more shallow and uses a smaller bearing.
    The Record cone is more concave and uses a bigger bearing.
    I did a lot of internet and forum searching to see if swapping was possible, but found no definitive answer.
    So I used the Record cones and larger bearings but left the original cups in the GS hubs.
    Problem is, I can now hear the bearings slapping into each other. I believe I have the bearings adjusted correctly.
    No play with skewer tightened and wheel spins freely: a little play with skewer loose.
    Anyone have some knowledge on this?

  3. #3
    Senior Member skilsaw's Avatar
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    From reading your subject line, I thought this was a thread about your bicycle seat.
    The one who has the most bikes wins.

  4. #4
    Senior member Dan Burkhart's Avatar
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    Sounds like a personal problem.
    Gearhubs demystified and other cool stuff.


    Rule #12: The correct number of bikes to own is n+1

  5. #5
    Senior Member Ira B's Avatar
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    Well I would recommend ...... oooops!

    Sorry, thought this was another saddle thread.
    Yep, THAT Ira

  6. #6
    Senior Member
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    Your thread title was indeed attention getting, but maybe the wrong kind of attention.

    Anyway, did you fill the race with enough bearings? Most rear hubs take 9x1/4" balls per side but if the hub originally had retainers, there may have been fewer balls.

  7. #7
    AmiableNitrite Member VonCarlos's Avatar
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    Here is a video of the bearing slap. There is plenty of grease, so much so, it was squeezing out the oil-hole in the dust-cap.


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