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Losing my bearings...

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Jameshambleton
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Losing my bearings...

Post by Jameshambleton on Mon 21 Aug 2017, 8:22 pm

Well the rear wheel bearing has gone, again.... On the disc side of the wheel yet again. Before I thought it was the cheapo bearings but this one was a NSK one which I'm shocked about.
I've checked the spacer between the caliper mount and the bearing and it seems square with no issues. 
Sprocket bearing, and near side bearing are also ok. 

Anyone got any suggestions?
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trevor machine
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Re: Losing my bearings...

Post by trevor machine on Mon 21 Aug 2017, 9:13 pm

Long shot - do you generally over- or and under-torque fasteners, bolts, nuts, etc.? I tend to under tighten stuff. So if you tend towards over-tightening stuff is it possible the bearing is being effectively crushed by too much force? Short of checking and double checking that all the spacers are OEM exactly right I honestly can't think what else could be causing - repeatedly - this problem. I suppose, theoretically, there could be some sort of undiagnosed issue with the swing arm itself - imagine it was somehow out of true, such that it created pressure that shouldn't be there once spindle bolt was tightened. But then wouldn't that be noticeable in the geometry of the rear half of the bike when riding? Doubtless all these and other possibilities have already circulated your speculations when trying to suss out what might be going on - but I'm just coming out with stuff as I type, really. I'll ask around tomorrow, see if considerably more experienced minds than mine can come up with something sensible. Until then, it seems that there's something quite seriously awry somewhere in all this. I only say this because I've got 40k and 50k respectively on my bikes' bearings so they're obviously capable of doing decent work.
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ANDYC
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Re: Losing my bearings...

Post by ANDYC on Mon 21 Aug 2017, 10:47 pm

Do you press the bearing down as far as it will go into the recess? 
That is a sure fire way to give them a short life. It should have been only pressed in until the centre lightly touches the tube like spacer.
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trevor machine
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Re: Losing my bearings...

Post by trevor machine on Tue 22 Aug 2017, 5:00 am

Fwiw I spoke to my older biking mate on the phone after I posted and he said more or less what you did, Andy.
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Jameshambleton
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Re: Losing my bearings...

Post by Jameshambleton on Tue 22 Aug 2017, 9:56 am

I've found the issue and it's the wheel itself. I found the entire bearing has play not just the innerrace. It would have appeared to have worn the hub itself.
I'm thinking jbweld and then getting it milled down to the bearing size would be the right way to go about it?
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ANDYC
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Re: Losing my bearings...

Post by ANDYC on Tue 22 Aug 2017, 10:19 am

I would get a wheel specialist to do it James. It would have to be perfectly concentric to the spindle and such a thin layer of jbweld wouldn't last long.
Either an insert or a proper weld would be much better.
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liverpool_f_
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Re: Losing my bearings...

Post by liverpool_f_ on Tue 22 Aug 2017, 10:46 pm

Or more simply, a secondhand wheel that is true.
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trevor machine
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Re: Losing my bearings...

Post by trevor machine on Wed 23 Aug 2017, 6:15 am

They generally seem to come in at £80.
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Vardypeeps
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Re: Losing my bearings...

Post by Vardypeeps on Thu 31 Aug 2017, 12:32 pm

£80 isn't bad for a wheel.

Thinking about what AndyC has said my VTR1000 blew apart 2 front wheel bearings and I suspect it's because I've driven them too far into the wheel, the bearing spacer had become stuck and was spinning inside the bearing.....

How can you ensure they are level if not against the wheels hub or when torqued up would this settle everything into place?
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ANDYC
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Re: Losing my bearings...

Post by ANDYC on Thu 31 Aug 2017, 4:42 pm

The inner spacer is there so that when the spindle is tightened the inner races don't get squeezed in. 
When they do it means that the ball bearings inside are pushed hard against the walls and can't rotate freely as they're meant to. 
This is why you get the accelerated wear.
Just tap in the bearing using the outer race, never the inner one until the inner race is just touching the spacer and you can still move the spacer a little with your finger.
I tap in the first bearing on the disc side until it's fully seated and make the fine adjustment on the second bearing purely so that I know the wheel is in the same centered position.
The sprocket alignment isn't as critical. But a few thou isn't going to matter anyway it's just my way of doing it.

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