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Rear wheel bearings

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Grarea
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Posts : 292
Location : Cornwall

Rear wheel bearings

Post by Grarea on Thu 21 Sep 2017, 3:38 pm

There is a little bit of play in the rear wheel.

Before I decide whether to go at this myself, is it possible it could be the swing arm bearings please?

It feels like the wheel bearings to me, but what do I know?
How do you test those? (swing arm bearings)
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Jameshambleton
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Re: Rear wheel bearings

Post by Jameshambleton on Thu 21 Sep 2017, 6:42 pm

Swingarm bearing are tested by having the rear end lifted up in the air and moving the swingarm left and right, remember that there might be some play in the arms depending on how you test it. 

I found the best way of testing the rear wheel bearings is to undo the axle bolt nut so it's loose and then move the wheel up and down it'll show any free play much more freely.
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Grarea
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Re: Rear wheel bearings

Post by Grarea on Thu 21 Sep 2017, 6:50 pm

Nice, thanks.

Actually, so, when I take the back wheel out, with it on its centre stand, I can try wiggling the swing arm then to feel for any play.

(I will struggle to lift the bike up and wiggle.)

Would that work?
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stormbringer
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Re: Rear wheel bearings

Post by stormbringer on Thu 21 Sep 2017, 8:11 pm

Replaced my swinging arm bearings recently. And had the swinging arm re-powder-coated in the process.

You may want to check the swinging arm axle itself; surprisingly little play/wear causes a lateral wiggle, inducing loss of plantedness.
This is how mine looked - the wear is actually visible after cleaning:


It's a no-cost-procedure to extract, clean and examine the axle. Mine was worn - probably because it hadn't been torqued down properly.
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Grarea
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Location : Cornwall

Re: Rear wheel bearings

Post by Grarea on Thu 21 Sep 2017, 8:21 pm

Sounds lovely.
I would love to do this but it is my only transport at the moment.

Good point, thanks. I will do that.
I see what you are saying about not needing much play to affect it.
It will be exacerbated by the distance to the axle won't it?

Will I detect any wear in the bearings by wiggling the swingarm do you think?
I am pretty sure what I can feel at the moment is in the wheel, but would like to test the swingarm independently.

How hard are the swing arm bearings to replace?
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stormbringer
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Re: Rear wheel bearings

Post by stormbringer on Thu 21 Sep 2017, 8:42 pm

@Grarea wrote:It will be exacerbated by the distance to the axle won't it?

How hard are the swing arm bearings to replace?


I guess it will. Which is why  I wrongly chose to go ahead and change the bearings. No need methinks.

Lateral wiggle = bearing-wear + axle-wear.

Bearings are hard to change imo. Left that to my trusted dealer - he fixed it no probs. However, I got a replacement swingarm-axle too, so can't really verify the effect as it was a combined effort. It is (the effect), however, noticeable!

Had I known in advance, I'd replaced the worn axle and torqued the replacement axle up properly! Then, retried probing the lateral wiggle.

IMHO, you won't need to replace the swinging arm bearings. YMMV!

Note on 'trusted dealer': I know, I'm a sucker. But  being at the end of my wits, this guy - workshop of the year, third year in a row - brought home the bacon. Can't really argue with that.
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ANDYC
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Re: Rear wheel bearings

Post by ANDYC on Thu 21 Sep 2017, 10:15 pm

Purely looking at it from an engineering point of view. 
Most of the strain on the swingarm pivot happens on the chain side as that's where the power is applied. 
Before replacing the spindle and bearings just take out the spindle and fit it from the opposite side and see if the play is still there. If the play is less problem solved. If the play remains then it's probably the bearings but you've at least identified the culprit for next to no effort.
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Grarea
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Location : Cornwall

Re: Rear wheel bearings

Post by Grarea on Sat 23 Sep 2017, 7:21 pm

With the wheel out, I can feel no movement in the swingarm.
Does that mean all is well?
Or would I need to take the suspension off first before I could detect any play?

Looking at it, to check the swingarm axle would also need removing the suspension right?
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ANDYC
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Re: Rear wheel bearings

Post by ANDYC on Sat 23 Sep 2017, 8:30 pm

No you can take the spindle out and the shocks will hold the swingarm in place so you can check it.
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Grarea
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Posts : 292
Location : Cornwall

Re: Rear wheel bearings

Post by Grarea on Sun 24 Sep 2017, 1:09 pm

Thanks.
Well, it seems straight which is nice.
How much wear should there or shouldn't there be?

You wouldn't mind it on the outside, but it would be a definite changer if it was on a bearing.
IMGP1480 by chuffedas, on Flickr
IMGP1483 by chuffedas, on Flickr
IMGP1482 by chuffedas, on Flickr
IMGP1481 by chuffedas, on Flickr
You can feel a bit of a flat spot on the last picture.
You can make out ridges when you feel on the third, plus there is a little pitting.
Like I say, you wouldn't mind it on your gear lever ......
What do you reckon?
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ANDYC
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Re: Rear wheel bearings

Post by ANDYC on Sun 24 Sep 2017, 2:33 pm

Put it back in from the opposite side and it will be fine.
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Grarea
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Location : Cornwall

Re: Rear wheel bearings

Post by Grarea on Sun 24 Sep 2017, 3:21 pm

@stormbringer wrote:

@Grarea wrote:It will be exacerbated by the distance to the axle won't it?

How hard are the swing arm bearings to replace?




I guess it will. Which is why  I wrongly chose to go ahead and change the bearings. No need methinks.

Lateral wiggle = bearing-wear + axle-wear.

Bearings are hard to change imo. Left that to my trusted dealer - he fixed it no probs. However, I got a replacement swingarm-axle too, so can't really verify the effect as it was a combined effort. It is (the effect), however, noticeable!

Had I known in advance, I'd replaced the worn axle and torqued the replacement axle up properly! Then, retried probing the lateral wiggle.

IMHO, you won't need to replace the swinging arm bearings. YMMV!

Note on 'trusted dealer': I know, I'm a sucker. But  being at the end of my wits, this guy - workshop of the year, third year in a row - brought home the bacon. Can't really argue with that.
Good old hindsight eh? Gives 20:20 vision. Makes the perfect gambler etc etc etc etc
But, if it helps, your experience has helped me.
Thanks.

I will take my wheel in for the bearings to be done.
I took the steering bearings in and boy I was glad I did.
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Grarea
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Posts : 292
Location : Cornwall

Re: Rear wheel bearings

Post by Grarea on Sun 24 Sep 2017, 3:23 pm

@ANDYC wrote:Put it back in from the opposite side and it will be fine.

Good one, thanks, job jobbed.
I could feel no play either.
I left it a bit loose to see what it would feel like but it tightened up lovely.

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