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Hub locknut sweet spot

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Old 06-20-10, 09:39 AM
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rousseau
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Hub locknut sweet spot

I've just overhauled my 1997 Campy record rear hub, and I can't seem to find that happy medium between sufficient looseness so that the wheel spins completely freely and sufficient tightness so that the wheel doesn't shake from side to side.

It literally seems like no more than a millimetre either way. However, maybe I'm asking for too much "free spin"? When I get it laterally tight, the wheel spins freely for a fairly short time, but when I get out on the road I don't really think I'm feeling any resistance.

Is it a given that your front wheel will spin longer than your back wheel? Or, well, here's the thing: I put one extra ball into the driveside cup of the hub than was officially specified, because the gap seemed big enough for it to be in there. The balls are fairly tightly packed in there. Should I remove that extra ball and try again?

Another question, if I may: the pawls are making a pulsing rhythm when coasting instead of a straight buzz. Could that be a problem with the springs under the pawls?
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Old 06-20-10, 10:16 AM
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remove the extra ball, campy knows better than you
Originally Posted by rousseau View Post
I've just overhauled my 1997 Campy record rear hub, and I can't seem to find that happy medium between sufficient looseness so that the wheel spins completely freely and sufficient tightness so that the wheel doesn't shake from side to side.

It literally seems like no more than a millimetre either way. However, maybe I'm asking for too much "free spin"? When I get it laterally tight, the wheel spins freely for a fairly short time, but when I get out on the road I don't really think I'm feeling any resistance.

Is it a given that your front wheel will spin longer than your back wheel? Or, well, here's the thing: I put one extra ball into the driveside cup of the hub than was officially specified, because the gap seemed big enough for it to be in there. The balls are fairly tightly packed in there. Should I remove that extra ball and try again?



Another question, if I may: the pawls are making a pulsing rhythm when coasting instead of a straight buzz. Could that be a problem with the springs under the pawls?
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Old 06-20-10, 10:47 AM
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Absolutely, positively remove the extra ball, and leave bearing engineering to those who know.

If you ever have to decide between one too few, or one too many, always go short. One ball too few on a correctly adjusted hub will not affect function at all, but one ball too many, even if it appears OK will make proper adjustment impossible, and lead to a number of other complications.

As the prior poster has said, Campy knows better. After all they've been making hubs for over half a century, and if they thought another ball would improve things it'd be there. Unless you think they're trying to save production costs.

BTW- the uneven freehub noise may be related to the extra ball which may have pushed the axle sideways.
noticable the balls wi
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Old 06-20-10, 10:54 AM
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Hmm....so you're saying I should remove the extra ball? Okay, I'll do that and report back.
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Old 06-20-10, 11:39 AM
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Originally Posted by cnnrmccloskey View Post
remove the extra ball, campy knows better than you
Originally Posted by FBinNY View Post
Absolutely, positively remove the extra ball,
Originally Posted by rousseau View Post
Hmm....so you're saying I should remove the extra ball?
I like the question mark. Were we not clear enough?

Look at it this way. No problems until you added a ball, do you really believe it's a coincidence?
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Old 06-20-10, 01:22 PM
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Originally Posted by FBinNY View Post
I like the question mark. Were we not clear enough?
It was deadpan. Humour, like.

In any case, I admit it, I'm a moran. I can't explain what possessed me to put that extra ball in there, as in retrospect it clearly appears to have been a dumb thing to do. I took the extra ball out, put the hub back together and voila, it works nicely.

D'oh!
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Old 06-20-10, 03:13 PM
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Originally Posted by rousseau View Post
It was deadpan. Humour, like.

In any case, I admit it, I'm a moran. I can't explain what possessed me to put that extra ball in there, as in retrospect it clearly appears to have been a dumb thing to do. I took the extra ball out, put the hub back together and voila, it works nicely.

D'oh!
I've done the same thing with Shimano front hubs--added an extra ball just because there was room for it, thinking fewer balls would create looseness or play. But the engineers designed these hubs to work in a certain way. The races of the cups and cones have a certain curve, height and diameter. The size and number of balls are spec'd so that the balls run in a track right in the middle of this "wall".
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Old 06-20-10, 03:53 PM
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Originally Posted by rousseau View Post
It was deadpan. Humour, like.

In any case, I admit it, I'm a moran. I can't explain what possessed me to put that extra ball in there,
D'oh!
I wouldn't sweat it, it's part of the learning process, like sticking your finger into a flame as a child. Hopefully it's something you only do once.

At least you said so up front, which made helping you simple. The typical poster with a similar problem would wait until 50 people tried to figure out the cause before coming back and posting "Oh, BTW- I added an extra ball, do you think that might have been a factor?"
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