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Old 11-17-11, 04:15 PM   #1
VonCarlos
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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?
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Old 11-17-11, 04:25 PM   #2
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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.

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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?
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Old 11-17-11, 06:46 PM   #3
skilsaw
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From reading your subject line, I thought this was a thread about your bicycle seat.
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Old 11-17-11, 06:53 PM   #4
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Sounds like a personal problem.
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Old 11-17-11, 07:30 PM   #5
Ira B
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Well I would recommend ...... oooops!

Sorry, thought this was another saddle thread.
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Old 11-17-11, 08:35 PM   #6
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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.
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Old 11-18-11, 10:35 AM   #7
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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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