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Old 08-03-09, 08:49 PM   #1
bergermeister
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headset bearings different

On a circa 1978-1980 peugeot tandem, the headset has 5/32 bearings on top and 3/16 on the bottom. I don't know the history on this bike, so I wonder if someone didn't change something at some point.

Does this sound right - 2 different sizes? The races look to be the same size.
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Old 08-04-09, 10:24 AM   #2
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Does not sound right to me. What happens when you flop the bearings around? Do the larger ones work the same as the smaller ones? The largish bearings should not spin in a race sized for smaller bearings as smoothly - they will bind for certain ..
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Old 08-04-09, 10:49 AM   #3
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Does not sound right to me. What happens when you flop the bearings around? Do the larger ones work the same as the smaller ones? The largish bearings should not spin in a race sized for smaller bearings as smoothly - they will bind for certain ..
The larger bearings seem to fit OK. Better to go with the larger or smaller? Or keep them different?
Will 2 different sizes introduce a looseness or slop as the races are not 'clamping' on the same diameter bearing?
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Old 08-04-09, 10:58 AM   #4
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I've seen this in a more modern A-headset, so it could be correct. I found this out when an over-zealous, but entirely untalented mechanic tried to rebuild half my bike, which had only gone in for a bottom bracket fix, and he used the wrong size bearings in my headset. It would not turn when I collected the bike from the shop...

Look carefully at the clearences/stacking of the assembly to see if it looks and feels correct.

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