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Old 07-24-07, 01:10 PM   #1
San Rensho 
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Sealed bearing headset binding

I switched from a loose ball to sealed bearing headset (Nashbar, 1" threaded) and something doesn't feel right. Its very smooth and it tracks fine when I ride it with no hands, but there seems to be just the slightest amount of sticking or resistance when I go to make a fast turn. Its not the index type sticking from damaged BB headsets, just a slight resistance to turning.

I've adjusted the headset so there is no play, but if I were to back off the adjustment nut 30 degrees or so, I would feel some play.

Am I doing something wrong?
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Old 07-24-07, 02:05 PM   #2
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Originally Posted by vpiuva View Post
Sounds like maybe the cups aren't parallel. I've used that same headset and didn't have a problem. Knock on wood.
Good point. I painted the frame and just had the headtube and fork crown faced. Wonder if the mechanic messed up?
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Old 07-24-07, 04:15 PM   #3
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Pretty hard to mess that up if the proper tool is being used.

Maybe the bearing mounts (cups for loose balls) aren't seated completely.
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Old 07-28-07, 01:09 PM   #4
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Well, the problem was machanical failure. As a mechanic, I was a failure.

I took it apart, measured the parralelism between the cups, which was fine so it wasn't the LBS milling job on the headtube that was causing the binding.

I examined the upper and lower sealed bearings and they looked to be identical, so I swapped top to bottom. Apparently they are not identical and now that the bearings are in the right place, the headset works like a dream.

Oh well, live and learn.
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Old 07-29-07, 05:18 PM   #5
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Originally Posted by San Rensho View Post
Well, the problem was machanical failure. As a mechanic, I was a failure.

I took it apart, measured the parralelism between the cups, which was fine so it wasn't the LBS milling job on the headtube that was causing the binding.

I examined the upper and lower sealed bearings and they looked to be identical, so I swapped top to bottom. Apparently they are not identical and now that the bearings are in the right place, the headset works like a dream.

Oh well, live and learn.
I'd be interested to learn if there really is any difference between those bearings (do they have different part #s?) or if Arnie has struck yet again...
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Old 07-30-07, 07:56 AM   #6
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I'd be interested to learn if there really is any difference between those bearings (do they have different part #s?) or if Arnie has struck yet again...
I looked at them pretty closely, and I couldn't see a difference, but when I switched them, the space between the adjustable race and the top cup was different, so I guess I'm assuming they are different.

Who is Arnie?
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